/*
 * This file is part of the Chelsio T6 Crypto driver for Linux.
 *
 * Copyright (c) 2003-2016 Chelsio Communications, Inc. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 * Written and Maintained by:
 *      Manoj Malviya (manojmalviya@chelsio.com)
 *      Atul Gupta (atul.gupta@chelsio.com)
 *      Jitendra Lulla (jlulla@chelsio.com)
 *      Yeshaswi M R Gowda (yeshaswi@chelsio.com)
 *      Harsh Jain (harsh@chelsio.com)
 */

#define pr_fmt(fmt) "chcr:" fmt

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/crypto.h>
#include <linux/skbuff.h>
#include <linux/rtnetlink.h>
#include <linux/highmem.h>
#include <linux/scatterlist.h>

#include <crypto/aes.h>
#include <crypto/algapi.h>
#include <crypto/hash.h>
#include <crypto/gcm.h>
#include <crypto/sha.h>
#include <crypto/authenc.h>
#include <crypto/ctr.h>
#include <crypto/gf128mul.h>
#include <crypto/internal/aead.h>
#include <crypto/null.h>
#include <crypto/internal/skcipher.h>
#include <crypto/aead.h>
#include <crypto/scatterwalk.h>
#include <crypto/internal/hash.h>

#include "t4fw_api.h"
#include "t4_msg.h"
#include "chcr_core.h"
#include "chcr_algo.h"
#include "chcr_crypto.h"

#define IV AES_BLOCK_SIZE

static unsigned int sgl_ent_len[] = {
        0, 0, 16, 24, 40, 48, 64, 72, 88,
        96, 112, 120, 136, 144, 160, 168, 184,
        192, 208, 216, 232, 240, 256, 264, 280,
        288, 304, 312, 328, 336, 352, 360, 376
};

static unsigned int dsgl_ent_len[] = {
        0, 32, 32, 48, 48, 64, 64, 80, 80,
        112, 112, 128, 128, 144, 144, 160, 160,
        192, 192, 208, 208, 224, 224, 240, 240,
        272, 272, 288, 288, 304, 304, 320, 320
};

static u32 round_constant[11] = {
        0x01000000, 0x02000000, 0x04000000, 0x08000000,
        0x10000000, 0x20000000, 0x40000000, 0x80000000,
        0x1B000000, 0x36000000, 0x6C000000
};

static int chcr_handle_cipher_resp(struct skcipher_request *req,
                                   unsigned char *input, int err);

static inline  struct chcr_aead_ctx *AEAD_CTX(struct chcr_context *ctx)
{
        return ctx->crypto_ctx->aeadctx;
}

static inline struct ablk_ctx *ABLK_CTX(struct chcr_context *ctx)
{
        return ctx->crypto_ctx->ablkctx;
}

static inline struct hmac_ctx *HMAC_CTX(struct chcr_context *ctx)
{
        return ctx->crypto_ctx->hmacctx;
}

static inline struct chcr_gcm_ctx *GCM_CTX(struct chcr_aead_ctx *gctx)
{
        return gctx->ctx->gcm;
}

static inline struct chcr_authenc_ctx *AUTHENC_CTX(struct chcr_aead_ctx *gctx)
{
        return gctx->ctx->authenc;
}

static inline struct uld_ctx *ULD_CTX(struct chcr_context *ctx)
{
        return container_of(ctx->dev, struct uld_ctx, dev);
}

static inline int is_ofld_imm(const struct sk_buff *skb)
{
        return (skb->len <= SGE_MAX_WR_LEN);
}

static inline void chcr_init_hctx_per_wr(struct chcr_ahash_req_ctx *reqctx)
{
        memset(&reqctx->hctx_wr, 0, sizeof(struct chcr_hctx_per_wr));
}

static int sg_nents_xlen(struct scatterlist *sg, unsigned int reqlen,
                         unsigned int entlen,
                         unsigned int skip)
{
        int nents = 0;
        unsigned int less;
        unsigned int skip_len = 0;

        while (sg && skip) {
                if (sg_dma_len(sg) <= skip) {
                        skip -= sg_dma_len(sg);
                        skip_len = 0;
                        sg = sg_next(sg);
                } else {
                        skip_len = skip;
                        skip = 0;
                }
        }

        while (sg && reqlen) {
                less = min(reqlen, sg_dma_len(sg) - skip_len);
                nents += DIV_ROUND_UP(less, entlen);
                reqlen -= less;
                skip_len = 0;
                sg = sg_next(sg);
        }
        return nents;
}

static inline int get_aead_subtype(struct crypto_aead *aead)
{
        struct aead_alg *alg = crypto_aead_alg(aead);
        struct chcr_alg_template *chcr_crypto_alg =
                container_of(alg, struct chcr_alg_template, alg.aead);
        return chcr_crypto_alg->type & CRYPTO_ALG_SUB_TYPE_MASK;
}

void chcr_verify_tag(struct aead_request *req, u8 *input, int *err)
{
        u8 temp[SHA512_DIGEST_SIZE];
        struct crypto_aead *tfm = crypto_aead_reqtfm(req);
        int authsize = crypto_aead_authsize(tfm);
        struct cpl_fw6_pld *fw6_pld;
        int cmp = 0;

        fw6_pld = (struct cpl_fw6_pld *)input;
        if ((get_aead_subtype(tfm) == CRYPTO_ALG_SUB_TYPE_AEAD_RFC4106) ||
            (get_aead_subtype(tfm) == CRYPTO_ALG_SUB_TYPE_AEAD_GCM)) {
                cmp = crypto_memneq(&fw6_pld->data[2], (fw6_pld + 1), authsize);
        } else {

                sg_pcopy_to_buffer(req->src, sg_nents(req->src), temp,
                                authsize, req->assoclen +
                                req->cryptlen - authsize);
                cmp = crypto_memneq(temp, (fw6_pld + 1), authsize);
        }
        if (cmp)
                *err = -EBADMSG;
        else
                *err = 0;
}

static int chcr_inc_wrcount(struct chcr_dev *dev)
{
        if (dev->state == CHCR_DETACH)
                return 1;
        atomic_inc(&dev->inflight);
        return 0;
}

static inline void chcr_dec_wrcount(struct chcr_dev *dev)
{
        atomic_dec(&dev->inflight);
}

static inline int chcr_handle_aead_resp(struct aead_request *req,
                                         unsigned char *input,
                                         int err)
{
        struct chcr_aead_reqctx *reqctx = aead_request_ctx(req);
        struct crypto_aead *tfm = crypto_aead_reqtfm(req);
        struct chcr_dev *dev = a_ctx(tfm)->dev;

        chcr_aead_common_exit(req);
        if (reqctx->verify == VERIFY_SW) {
                chcr_verify_tag(req, input, &err);
                reqctx->verify = VERIFY_HW;
        }
        chcr_dec_wrcount(dev);
        req->base.complete(&req->base, err);

        return err;
}

static void get_aes_decrypt_key(unsigned char *dec_key,
                                       const unsigned char *key,
                                       unsigned int keylength)
{
        u32 temp;
        u32 w_ring[MAX_NK];
        int i, j, k;
        u8  nr, nk;

        switch (keylength) {
        case AES_KEYLENGTH_128BIT:
                nk = KEYLENGTH_4BYTES;
                nr = NUMBER_OF_ROUNDS_10;
                break;
        case AES_KEYLENGTH_192BIT:
                nk = KEYLENGTH_6BYTES;
                nr = NUMBER_OF_ROUNDS_12;
                break;
        case AES_KEYLENGTH_256BIT:
                nk = KEYLENGTH_8BYTES;
                nr = NUMBER_OF_ROUNDS_14;
                break;
        default:
                return;
        }
        for (i = 0; i < nk; i++)
                w_ring[i] = get_unaligned_be32(&key[i * 4]);

        i = 0;
        temp = w_ring[nk - 1];
        while (i + nk < (nr + 1) * 4) {
                if (!(i % nk)) {
                        /* RotWord(temp) */
                        temp = (temp << 8) | (temp >> 24);
                        temp = aes_ks_subword(temp);
                        temp ^= round_constant[i / nk];
                } else if (nk == 8 && (i % 4 == 0)) {
                        temp = aes_ks_subword(temp);
                }
                w_ring[i % nk] ^= temp;
                temp = w_ring[i % nk];
                i++;
        }
        i--;
        for (k = 0, j = i % nk; k < nk; k++) {
                put_unaligned_be32(w_ring[j], &dec_key[k * 4]);
                j--;
                if (j < 0)
                        j += nk;
        }
}

static struct crypto_shash *chcr_alloc_shash(unsigned int ds)
{
        struct crypto_shash *base_hash = ERR_PTR(-EINVAL);

        switch (ds) {
        case SHA1_DIGEST_SIZE:
                base_hash = crypto_alloc_shash("sha1", 0, 0);
                break;
        case SHA224_DIGEST_SIZE:
                base_hash = crypto_alloc_shash("sha224", 0, 0);
                break;
        case SHA256_DIGEST_SIZE:
                base_hash = crypto_alloc_shash("sha256", 0, 0);
                break;
        case SHA384_DIGEST_SIZE:
                base_hash = crypto_alloc_shash("sha384", 0, 0);
                break;
        case SHA512_DIGEST_SIZE:
                base_hash = crypto_alloc_shash("sha512", 0, 0);
                break;
        }

        return base_hash;
}

static int chcr_compute_partial_hash(struct shash_desc *desc,
                                     char *iopad, char *result_hash,
                                     int digest_size)
{
        struct sha1_state sha1_st;
        struct sha256_state sha256_st;
        struct sha512_state sha512_st;
        int error;

        if (digest_size == SHA1_DIGEST_SIZE) {
                error = crypto_shash_init(desc) ?:
                        crypto_shash_update(desc, iopad, SHA1_BLOCK_SIZE) ?:
                        crypto_shash_export(desc, (void *)&sha1_st);
                memcpy(result_hash, sha1_st.state, SHA1_DIGEST_SIZE);
        } else if (digest_size == SHA224_DIGEST_SIZE) {
                error = crypto_shash_init(desc) ?:
                        crypto_shash_update(desc, iopad, SHA256_BLOCK_SIZE) ?:
                        crypto_shash_export(desc, (void *)&sha256_st);
                memcpy(result_hash, sha256_st.state, SHA256_DIGEST_SIZE);

        } else if (digest_size == SHA256_DIGEST_SIZE) {
                error = crypto_shash_init(desc) ?:
                        crypto_shash_update(desc, iopad, SHA256_BLOCK_SIZE) ?:
                        crypto_shash_export(desc, (void *)&sha256_st);
                memcpy(result_hash, sha256_st.state, SHA256_DIGEST_SIZE);

        } else if (digest_size == SHA384_DIGEST_SIZE) {
                error = crypto_shash_init(desc) ?:
                        crypto_shash_update(desc, iopad, SHA512_BLOCK_SIZE) ?:
                        crypto_shash_export(desc, (void *)&sha512_st);
                memcpy(result_hash, sha512_st.state, SHA512_DIGEST_SIZE);

        } else if (digest_size == SHA512_DIGEST_SIZE) {
                error = crypto_shash_init(desc) ?:
                        crypto_shash_update(desc, iopad, SHA512_BLOCK_SIZE) ?:
                        crypto_shash_export(desc, (void *)&sha512_st);
                memcpy(result_hash, sha512_st.state, SHA512_DIGEST_SIZE);
        } else {
                error = -EINVAL;
                pr_err("Unknown digest size %d\n", digest_size);
        }
        return error;
}

static void chcr_change_order(char *buf, int ds)
{
        int i;

        if (ds == SHA512_DIGEST_SIZE) {
                for (i = 0; i < (ds / sizeof(u64)); i++)
                        *((__be64 *)buf + i) =
                                cpu_to_be64(*((u64 *)buf + i));
        } else {
                for (i = 0; i < (ds / sizeof(u32)); i++)
                        *((__be32 *)buf + i) =
                                cpu_to_be32(*((u32 *)buf + i));
        }
}

static inline int is_hmac(struct crypto_tfm *tfm)
{
        struct crypto_alg *alg = tfm->__crt_alg;
        struct chcr_alg_template *chcr_crypto_alg =
                container_of(__crypto_ahash_alg(alg), struct chcr_alg_template,
                             alg.hash);
        if (chcr_crypto_alg->type == CRYPTO_ALG_TYPE_HMAC)
                return 1;
        return 0;
}

static inline void dsgl_walk_init(struct dsgl_walk *walk,
                                   struct cpl_rx_phys_dsgl *dsgl)
{
        walk->dsgl = dsgl;
        walk->nents = 0;
        walk->to = (struct phys_sge_pairs *)(dsgl + 1);
}

static inline void dsgl_walk_end(struct dsgl_walk *walk, unsigned short qid,
                                 int pci_chan_id)
{
        struct cpl_rx_phys_dsgl *phys_cpl;

        phys_cpl = walk->dsgl;

        phys_cpl->op_to_tid = htonl(CPL_RX_PHYS_DSGL_OPCODE_V(CPL_RX_PHYS_DSGL)
                                    | CPL_RX_PHYS_DSGL_ISRDMA_V(0));
        phys_cpl->pcirlxorder_to_noofsgentr =
                htonl(CPL_RX_PHYS_DSGL_PCIRLXORDER_V(0) |
                      CPL_RX_PHYS_DSGL_PCINOSNOOP_V(0) |
                      CPL_RX_PHYS_DSGL_PCITPHNTENB_V(0) |
                      CPL_RX_PHYS_DSGL_PCITPHNT_V(0) |
                      CPL_RX_PHYS_DSGL_DCAID_V(0) |
                      CPL_RX_PHYS_DSGL_NOOFSGENTR_V(walk->nents));
        phys_cpl->rss_hdr_int.opcode = CPL_RX_PHYS_ADDR;
        phys_cpl->rss_hdr_int.qid = htons(qid);
        phys_cpl->rss_hdr_int.hash_val = 0;
        phys_cpl->rss_hdr_int.channel = pci_chan_id;
}

static inline void dsgl_walk_add_page(struct dsgl_walk *walk,
                                        size_t size,
                                        dma_addr_t addr)
{
        int j;

        if (!size)
                return;
        j = walk->nents;
        walk->to->len[j % 8] = htons(size);
        walk->to->addr[j % 8] = cpu_to_be64(addr);
        j++;
        if ((j % 8) == 0)
                walk->to++;
        walk->nents = j;
}

static void  dsgl_walk_add_sg(struct dsgl_walk *walk,
                           struct scatterlist *sg,
                              unsigned int slen,
                              unsigned int skip)
{
        int skip_len = 0;
        unsigned int left_size = slen, len = 0;
        unsigned int j = walk->nents;
        int offset, ent_len;

        if (!slen)
                return;
        while (sg && skip) {
                if (sg_dma_len(sg) <= skip) {
                        skip -= sg_dma_len(sg);
                        skip_len = 0;
                        sg = sg_next(sg);
                } else {
                        skip_len = skip;
                        skip = 0;
                }
        }

        while (left_size && sg) {
                len = min_t(u32, left_size, sg_dma_len(sg) - skip_len);
                offset = 0;
                while (len) {
                        ent_len =  min_t(u32, len, CHCR_DST_SG_SIZE);
                        walk->to->len[j % 8] = htons(ent_len);
                        walk->to->addr[j % 8] = cpu_to_be64(sg_dma_address(sg) +
                                                      offset + skip_len);
                        offset += ent_len;
                        len -= ent_len;
                        j++;
                        if ((j % 8) == 0)
                                walk->to++;
                }
                walk->last_sg = sg;
                walk->last_sg_len = min_t(u32, left_size, sg_dma_len(sg) -
                                          skip_len) + skip_len;
                left_size -= min_t(u32, left_size, sg_dma_len(sg) - skip_len);
                skip_len = 0;
                sg = sg_next(sg);
        }
        walk->nents = j;
}

static inline void ulptx_walk_init(struct ulptx_walk *walk,
                                   struct ulptx_sgl *ulp)
{
        walk->sgl = ulp;
        walk->nents = 0;
        walk->pair_idx = 0;
        walk->pair = ulp->sge;
        walk->last_sg = NULL;
        walk->last_sg_len = 0;
}

static inline void ulptx_walk_end(struct ulptx_walk *walk)
{
        walk->sgl->cmd_nsge = htonl(ULPTX_CMD_V(ULP_TX_SC_DSGL) |
                              ULPTX_NSGE_V(walk->nents));
}


static inline void ulptx_walk_add_page(struct ulptx_walk *walk,
                                        size_t size,
                                        dma_addr_t addr)
{
        if (!size)
                return;

        if (walk->nents == 0) {
                walk->sgl->len0 = cpu_to_be32(size);
                walk->sgl->addr0 = cpu_to_be64(addr);
        } else {
                walk->pair->addr[walk->pair_idx] = cpu_to_be64(addr);
                walk->pair->len[walk->pair_idx] = cpu_to_be32(size);
                walk->pair_idx = !walk->pair_idx;
                if (!walk->pair_idx)
                        walk->pair++;
        }
        walk->nents++;
}

static void  ulptx_walk_add_sg(struct ulptx_walk *walk,
                                        struct scatterlist *sg,
                               unsigned int len,
                               unsigned int skip)
{
        int small;
        int skip_len = 0;
        unsigned int sgmin;

        if (!len)
                return;
        while (sg && skip) {
                if (sg_dma_len(sg) <= skip) {
                        skip -= sg_dma_len(sg);
                        skip_len = 0;
                        sg = sg_next(sg);
                } else {
                        skip_len = skip;
                        skip = 0;
                }
        }
        WARN(!sg, "SG should not be null here\n");
        if (sg && (walk->nents == 0)) {
                small = min_t(unsigned int, sg_dma_len(sg) - skip_len, len);
                sgmin = min_t(unsigned int, small, CHCR_SRC_SG_SIZE);
                walk->sgl->len0 = cpu_to_be32(sgmin);
                walk->sgl->addr0 = cpu_to_be64(sg_dma_address(sg) + skip_len);
                walk->nents++;
                len -= sgmin;
                walk->last_sg = sg;
                walk->last_sg_len = sgmin + skip_len;
                skip_len += sgmin;
                if (sg_dma_len(sg) == skip_len) {
                        sg = sg_next(sg);
                        skip_len = 0;
                }
        }

        while (sg && len) {
                small = min(sg_dma_len(sg) - skip_len, len);
                sgmin = min_t(unsigned int, small, CHCR_SRC_SG_SIZE);
                walk->pair->len[walk->pair_idx] = cpu_to_be32(sgmin);
                walk->pair->addr[walk->pair_idx] =
                        cpu_to_be64(sg_dma_address(sg) + skip_len);
                walk->pair_idx = !walk->pair_idx;
                walk->nents++;
                if (!walk->pair_idx)
                        walk->pair++;
                len -= sgmin;
                skip_len += sgmin;
                walk->last_sg = sg;
                walk->last_sg_len = skip_len;
                if (sg_dma_len(sg) == skip_len) {
                        sg = sg_next(sg);
                        skip_len = 0;
                }
        }
}

static inline int get_cryptoalg_subtype(struct crypto_skcipher *tfm)
{
        struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
        struct chcr_alg_template *chcr_crypto_alg =
                container_of(alg, struct chcr_alg_template, alg.skcipher);

        return chcr_crypto_alg->type & CRYPTO_ALG_SUB_TYPE_MASK;
}

static int cxgb4_is_crypto_q_full(struct net_device *dev, unsigned int idx)
{
        struct adapter *adap = netdev2adap(dev);
        struct sge_uld_txq_info *txq_info =
                adap->sge.uld_txq_info[CXGB4_TX_CRYPTO];
        struct sge_uld_txq *txq;
        int ret = 0;

        local_bh_disable();
        txq = &txq_info->uldtxq[idx];
        spin_lock(&txq->sendq.lock);
        if (txq->full)
                ret = -1;
        spin_unlock(&txq->sendq.lock);
        local_bh_enable();
        return ret;
}

static int generate_copy_rrkey(struct ablk_ctx *ablkctx,
                               struct _key_ctx *key_ctx)
{
        if (ablkctx->ciph_mode == CHCR_SCMD_CIPHER_MODE_AES_CBC) {
                memcpy(key_ctx->key, ablkctx->rrkey, ablkctx->enckey_len);
        } else {
                memcpy(key_ctx->key,
                       ablkctx->key + (ablkctx->enckey_len >> 1),
                       ablkctx->enckey_len >> 1);
                memcpy(key_ctx->key + (ablkctx->enckey_len >> 1),
                       ablkctx->rrkey, ablkctx->enckey_len >> 1);
        }
        return 0;
}

static int chcr_hash_ent_in_wr(struct scatterlist *src,
                             unsigned int minsg,
                             unsigned int space,
                             unsigned int srcskip)
{
        int srclen = 0;
        int srcsg = minsg;
        int soffset = 0, sless;

        if (sg_dma_len(src) == srcskip) {
                src = sg_next(src);
                srcskip = 0;
        }
        while (src && space > (sgl_ent_len[srcsg + 1])) {
                sless = min_t(unsigned int, sg_dma_len(src) - soffset - srcskip,
                                                        CHCR_SRC_SG_SIZE);
                srclen += sless;
                soffset += sless;
                srcsg++;
                if (sg_dma_len(src) == (soffset + srcskip)) {
                        src = sg_next(src);
                        soffset = 0;
                        srcskip = 0;
                }
        }
        return srclen;
}

static int chcr_sg_ent_in_wr(struct scatterlist *src,
                             struct scatterlist *dst,
                             unsigned int minsg,
                             unsigned int space,
                             unsigned int srcskip,
                             unsigned int dstskip)
{
        int srclen = 0, dstlen = 0;
        int srcsg = minsg, dstsg = minsg;
        int offset = 0, soffset = 0, less, sless = 0;

        if (sg_dma_len(src) == srcskip) {
                src = sg_next(src);
                srcskip = 0;
        }
        if (sg_dma_len(dst) == dstskip) {
                dst = sg_next(dst);
                dstskip = 0;
        }

        while (src && dst &&
               space > (sgl_ent_len[srcsg + 1] + dsgl_ent_len[dstsg])) {
                sless = min_t(unsigned int, sg_dma_len(src) - srcskip - soffset,
                                CHCR_SRC_SG_SIZE);
                srclen += sless;
                srcsg++;
                offset = 0;
                while (dst && ((dstsg + 1) <= MAX_DSGL_ENT) &&
                       space > (sgl_ent_len[srcsg] + dsgl_ent_len[dstsg + 1])) {
                        if (srclen <= dstlen)
                                break;
                        less = min_t(unsigned int, sg_dma_len(dst) - offset -
                                     dstskip, CHCR_DST_SG_SIZE);
                        dstlen += less;
                        offset += less;
                        if ((offset + dstskip) == sg_dma_len(dst)) {
                                dst = sg_next(dst);
                                offset = 0;
                        }
                        dstsg++;
                        dstskip = 0;
                }
                soffset += sless;
                if ((soffset + srcskip) == sg_dma_len(src)) {
                        src = sg_next(src);
                        srcskip = 0;
                        soffset = 0;
                }

        }
        return min(srclen, dstlen);
}

static int chcr_cipher_fallback(struct crypto_skcipher *cipher,
                                struct skcipher_request *req,
                                u8 *iv,
                                unsigned short op_type)
{
        struct chcr_skcipher_req_ctx *reqctx = skcipher_request_ctx(req);
        int err;

        skcipher_request_set_tfm(&reqctx->fallback_req, cipher);
        skcipher_request_set_callback(&reqctx->fallback_req, req->base.flags,
                                      req->base.complete, req->base.data);
        skcipher_request_set_crypt(&reqctx->fallback_req, req->src, req->dst,
                                   req->cryptlen, iv);

        err = op_type ? crypto_skcipher_decrypt(&reqctx->fallback_req) :
                        crypto_skcipher_encrypt(&reqctx->fallback_req);

        return err;

}

static inline int get_qidxs(struct crypto_async_request *req,
                            unsigned int *txqidx, unsigned int *rxqidx)
{
        struct crypto_tfm *tfm = req->tfm;
        int ret = 0;

        switch (tfm->__crt_alg->cra_flags & CRYPTO_ALG_TYPE_MASK) {
        case CRYPTO_ALG_TYPE_AEAD:
        {
                struct aead_request *aead_req =
                        container_of(req, struct aead_request, base);
                struct chcr_aead_reqctx *reqctx = aead_request_ctx(aead_req);
                *txqidx = reqctx->txqidx;
                *rxqidx = reqctx->rxqidx;
                break;
        }
        case CRYPTO_ALG_TYPE_SKCIPHER:
        {
                struct skcipher_request *sk_req =
                        container_of(req, struct skcipher_request, base);
                struct chcr_skcipher_req_ctx *reqctx =
                        skcipher_request_ctx(sk_req);
                *txqidx = reqctx->txqidx;
                *rxqidx = reqctx->rxqidx;
                break;
        }
        case CRYPTO_ALG_TYPE_AHASH:
        {
                struct ahash_request *ahash_req =
                        container_of(req, struct ahash_request, base);
                struct chcr_ahash_req_ctx *reqctx =
                        ahash_request_ctx(ahash_req);
                *txqidx = reqctx->txqidx;
                *rxqidx = reqctx->rxqidx;
                break;
        }
        default:
                ret = -EINVAL;
                /* should never get here */
                BUG();
                break;
        }
        return ret;
}

static inline void create_wreq(struct chcr_context *ctx,
                               struct chcr_wr *chcr_req,
                               struct crypto_async_request *req,
                               unsigned int imm,
                               int hash_sz,
                               unsigned int len16,
                               unsigned int sc_len,
                               unsigned int lcb)
{
        struct uld_ctx *u_ctx = ULD_CTX(ctx);
        unsigned int tx_channel_id, rx_channel_id;
        unsigned int txqidx = 0, rxqidx = 0;
        unsigned int qid, fid;

        get_qidxs(req, &txqidx, &rxqidx);
        qid = u_ctx->lldi.rxq_ids[rxqidx];
        fid = u_ctx->lldi.rxq_ids[0];
        tx_channel_id = txqidx / ctx->txq_perchan;
        rx_channel_id = rxqidx / ctx->rxq_perchan;


        chcr_req->wreq.op_to_cctx_size = FILL_WR_OP_CCTX_SIZE;
        chcr_req->wreq.pld_size_hash_size =
                htonl(FW_CRYPTO_LOOKASIDE_WR_HASH_SIZE_V(hash_sz));
        chcr_req->wreq.len16_pkd =
                htonl(FW_CRYPTO_LOOKASIDE_WR_LEN16_V(DIV_ROUND_UP(len16, 16)));
        chcr_req->wreq.cookie = cpu_to_be64((uintptr_t)req);
        chcr_req->wreq.rx_chid_to_rx_q_id = FILL_WR_RX_Q_ID(rx_channel_id, qid,
                                                            !!lcb, txqidx);

        chcr_req->ulptx.cmd_dest = FILL_ULPTX_CMD_DEST(tx_channel_id, fid);
        chcr_req->ulptx.len = htonl((DIV_ROUND_UP(len16, 16) -
                                ((sizeof(chcr_req->wreq)) >> 4)));
        chcr_req->sc_imm.cmd_more = FILL_CMD_MORE(!imm);
        chcr_req->sc_imm.len = cpu_to_be32(sizeof(struct cpl_tx_sec_pdu) +
                                           sizeof(chcr_req->key_ctx) + sc_len);
}

/**
 *      create_cipher_wr - form the WR for cipher operations
 *      @req: cipher req.
 *      @ctx: crypto driver context of the request.
 *      @qid: ingress qid where response of this WR should be received.
 *      @op_type:       encryption or decryption
 */
static struct sk_buff *create_cipher_wr(struct cipher_wr_param *wrparam)
{
        struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(wrparam->req);
        struct chcr_context *ctx = c_ctx(tfm);
        struct ablk_ctx *ablkctx = ABLK_CTX(ctx);
        struct sk_buff *skb = NULL;
        struct chcr_wr *chcr_req;
        struct cpl_rx_phys_dsgl *phys_cpl;
        struct ulptx_sgl *ulptx;
        struct chcr_skcipher_req_ctx *reqctx =
                skcipher_request_ctx(wrparam->req);
        unsigned int temp = 0, transhdr_len, dst_size;
        int error;
        int nents;
        unsigned int kctx_len;
        gfp_t flags = wrparam->req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP ?
                        GFP_KERNEL : GFP_ATOMIC;
        struct adapter *adap = padap(ctx->dev);
        unsigned int rx_channel_id = reqctx->rxqidx / ctx->rxq_perchan;

        nents = sg_nents_xlen(reqctx->dstsg,  wrparam->bytes, CHCR_DST_SG_SIZE,
                              reqctx->dst_ofst);
        dst_size = get_space_for_phys_dsgl(nents);
        kctx_len = roundup(ablkctx->enckey_len, 16);
        transhdr_len = CIPHER_TRANSHDR_SIZE(kctx_len, dst_size);
        nents = sg_nents_xlen(reqctx->srcsg, wrparam->bytes,
                                  CHCR_SRC_SG_SIZE, reqctx->src_ofst);
        temp = reqctx->imm ? roundup(wrparam->bytes, 16) :
                                     (sgl_len(nents) * 8);
        transhdr_len += temp;
        transhdr_len = roundup(transhdr_len, 16);
        skb = alloc_skb(SGE_MAX_WR_LEN, flags);
        if (!skb) {
                error = -ENOMEM;
                goto err;
        }
        chcr_req = __skb_put_zero(skb, transhdr_len);
        chcr_req->sec_cpl.op_ivinsrtofst =
                        FILL_SEC_CPL_OP_IVINSR(rx_channel_id, 2, 1);

        chcr_req->sec_cpl.pldlen = htonl(IV + wrparam->bytes);
        chcr_req->sec_cpl.aadstart_cipherstop_hi =
                        FILL_SEC_CPL_CIPHERSTOP_HI(0, 0, IV + 1, 0);

        chcr_req->sec_cpl.cipherstop_lo_authinsert =
                        FILL_SEC_CPL_AUTHINSERT(0, 0, 0, 0);
        chcr_req->sec_cpl.seqno_numivs = FILL_SEC_CPL_SCMD0_SEQNO(reqctx->op, 0,
                                                         ablkctx->ciph_mode,
                                                         0, 0, IV >> 1);
        chcr_req->sec_cpl.ivgen_hdrlen = FILL_SEC_CPL_IVGEN_HDRLEN(0, 0, 0,
                                                          0, 1, dst_size);

        chcr_req->key_ctx.ctx_hdr = ablkctx->key_ctx_hdr;
        if ((reqctx->op == CHCR_DECRYPT_OP) &&
            (!(get_cryptoalg_subtype(tfm) ==
               CRYPTO_ALG_SUB_TYPE_CTR)) &&
            (!(get_cryptoalg_subtype(tfm) ==
               CRYPTO_ALG_SUB_TYPE_CTR_RFC3686))) {
                generate_copy_rrkey(ablkctx, &chcr_req->key_ctx);
        } else {
                if ((ablkctx->ciph_mode == CHCR_SCMD_CIPHER_MODE_AES_CBC) ||
                    (ablkctx->ciph_mode == CHCR_SCMD_CIPHER_MODE_AES_CTR)) {
                        memcpy(chcr_req->key_ctx.key, ablkctx->key,
                               ablkctx->enckey_len);
                } else {
                        memcpy(chcr_req->key_ctx.key, ablkctx->key +
                               (ablkctx->enckey_len >> 1),
                               ablkctx->enckey_len >> 1);
                        memcpy(chcr_req->key_ctx.key +
                               (ablkctx->enckey_len >> 1),
                               ablkctx->key,
                               ablkctx->enckey_len >> 1);
                }
        }
        phys_cpl = (struct cpl_rx_phys_dsgl *)((u8 *)(chcr_req + 1) + kctx_len);
        ulptx = (struct ulptx_sgl *)((u8 *)(phys_cpl + 1) + dst_size);
        chcr_add_cipher_src_ent(wrparam->req, ulptx, wrparam);
        chcr_add_cipher_dst_ent(wrparam->req, phys_cpl, wrparam, wrparam->qid);

        atomic_inc(&adap->chcr_stats.cipher_rqst);
        temp = sizeof(struct cpl_rx_phys_dsgl) + dst_size + kctx_len + IV
                + (reqctx->imm ? (wrparam->bytes) : 0);
        create_wreq(c_ctx(tfm), chcr_req, &(wrparam->req->base), reqctx->imm, 0,
                    transhdr_len, temp,
                        ablkctx->ciph_mode == CHCR_SCMD_CIPHER_MODE_AES_CBC);
        reqctx->skb = skb;

        if (reqctx->op && (ablkctx->ciph_mode ==
                           CHCR_SCMD_CIPHER_MODE_AES_CBC))
                sg_pcopy_to_buffer(wrparam->req->src,
                        sg_nents(wrparam->req->src), wrparam->req->iv, 16,
                        reqctx->processed + wrparam->bytes - AES_BLOCK_SIZE);

        return skb;
err:
        return ERR_PTR(error);
}

static inline int chcr_keyctx_ck_size(unsigned int keylen)
{
        int ck_size = 0;

        if (keylen == AES_KEYSIZE_128)
                ck_size = CHCR_KEYCTX_CIPHER_KEY_SIZE_128;
        else if (keylen == AES_KEYSIZE_192)
                ck_size = CHCR_KEYCTX_CIPHER_KEY_SIZE_192;
        else if (keylen == AES_KEYSIZE_256)
                ck_size = CHCR_KEYCTX_CIPHER_KEY_SIZE_256;
        else
                ck_size = 0;

        return ck_size;
}
static int chcr_cipher_fallback_setkey(struct crypto_skcipher *cipher,
                                       const u8 *key,
                                       unsigned int keylen)
{
        struct ablk_ctx *ablkctx = ABLK_CTX(c_ctx(cipher));

        crypto_skcipher_clear_flags(ablkctx->sw_cipher,
                                CRYPTO_TFM_REQ_MASK);
        crypto_skcipher_set_flags(ablkctx->sw_cipher,
                                cipher->base.crt_flags & CRYPTO_TFM_REQ_MASK);
        return crypto_skcipher_setkey(ablkctx->sw_cipher, key, keylen);
}

static int chcr_aes_cbc_setkey(struct crypto_skcipher *cipher,
                               const u8 *key,
                               unsigned int keylen)
{
        struct ablk_ctx *ablkctx = ABLK_CTX(c_ctx(cipher));
        unsigned int ck_size, context_size;
        u16 alignment = 0;
        int err;

        err = chcr_cipher_fallback_setkey(cipher, key, keylen);
        if (err)
                goto badkey_err;

        ck_size = chcr_keyctx_ck_size(keylen);
        alignment = ck_size == CHCR_KEYCTX_CIPHER_KEY_SIZE_192 ? 8 : 0;
        memcpy(ablkctx->key, key, keylen);
        ablkctx->enckey_len = keylen;
        get_aes_decrypt_key(ablkctx->rrkey, ablkctx->key, keylen << 3);
        context_size = (KEY_CONTEXT_HDR_SALT_AND_PAD +
                        keylen + alignment) >> 4;

        ablkctx->key_ctx_hdr = FILL_KEY_CTX_HDR(ck_size, CHCR_KEYCTX_NO_KEY,
                                                0, 0, context_size);
        ablkctx->ciph_mode = CHCR_SCMD_CIPHER_MODE_AES_CBC;
        return 0;
badkey_err:
        ablkctx->enckey_len = 0;

        return err;
}

static int chcr_aes_ctr_setkey(struct crypto_skcipher *cipher,
                                   const u8 *key,
                                   unsigned int keylen)
{
        struct ablk_ctx *ablkctx = ABLK_CTX(c_ctx(cipher));
        unsigned int ck_size, context_size;
        u16 alignment = 0;
        int err;

        err = chcr_cipher_fallback_setkey(cipher, key, keylen);
        if (err)
                goto badkey_err;
        ck_size = chcr_keyctx_ck_size(keylen);
        alignment = (ck_size == CHCR_KEYCTX_CIPHER_KEY_SIZE_192) ? 8 : 0;
        memcpy(ablkctx->key, key, keylen);
        ablkctx->enckey_len = keylen;
        context_size = (KEY_CONTEXT_HDR_SALT_AND_PAD +
                        keylen + alignment) >> 4;

        ablkctx->key_ctx_hdr = FILL_KEY_CTX_HDR(ck_size, CHCR_KEYCTX_NO_KEY,
                                                0, 0, context_size);
        ablkctx->ciph_mode = CHCR_SCMD_CIPHER_MODE_AES_CTR;

        return 0;
badkey_err:
        ablkctx->enckey_len = 0;

        return err;
}

static int chcr_aes_rfc3686_setkey(struct crypto_skcipher *cipher,
                                   const u8 *key,
                                   unsigned int keylen)
{
        struct ablk_ctx *ablkctx = ABLK_CTX(c_ctx(cipher));
        unsigned int ck_size, context_size;
        u16 alignment = 0;
        int err;

        if (keylen < CTR_RFC3686_NONCE_SIZE)

                return -EINVAL;
        memcpy(ablkctx->nonce, key + (keylen - CTR_RFC3686_NONCE_SIZE),
               CTR_RFC3686_NONCE_SIZE);

        keylen -= CTR_RFC3686_NONCE_SIZE;
        err = chcr_cipher_fallback_setkey(cipher, key, keylen);
        if (err)
                goto badkey_err;

        ck_size = chcr_keyctx_ck_size(keylen);
        alignment = (ck_size == CHCR_KEYCTX_CIPHER_KEY_SIZE_192) ? 8 : 0;
        memcpy(ablkctx->key, key, keylen);
        ablkctx->enckey_len = keylen;
        context_size = (KEY_CONTEXT_HDR_SALT_AND_PAD +
                        keylen + alignment) >> 4;

        ablkctx->key_ctx_hdr = FILL_KEY_CTX_HDR(ck_size, CHCR_KEYCTX_NO_KEY,
                                                0, 0, context_size);
        ablkctx->ciph_mode = CHCR_SCMD_CIPHER_MODE_AES_CTR;

        return 0;
badkey_err:
        ablkctx->enckey_len = 0;

        return err;
}
static void ctr_add_iv(u8 *dstiv, u8 *srciv, u32 add)
{
        unsigned int size = AES_BLOCK_SIZE;
        __be32 *b = (__be32 *)(dstiv + size);
        u32 c, prev;

        memcpy(dstiv, srciv, AES_BLOCK_SIZE);
        for (; size >= 4; size -= 4) {
                prev = be32_to_cpu(*--b);
                c = prev + add;
                *b = cpu_to_be32(c);
                if (prev < c)
                        break;
                add = 1;
        }

}

static unsigned int adjust_ctr_overflow(u8 *iv, u32 bytes)
{
        __be32 *b = (__be32 *)(iv + AES_BLOCK_SIZE);
        u64 c;
        u32 temp = be32_to_cpu(*--b);

        temp = ~temp;
        c = (u64)temp +  1; // No of block can processed without overflow
        if ((bytes / AES_BLOCK_SIZE) >= c)
                bytes = c * AES_BLOCK_SIZE;
        return bytes;
}

static int chcr_update_tweak(struct skcipher_request *req, u8 *iv,
                             u32 isfinal)
{
        struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
        struct ablk_ctx *ablkctx = ABLK_CTX(c_ctx(tfm));
        struct chcr_skcipher_req_ctx *reqctx = skcipher_request_ctx(req);
        struct crypto_aes_ctx aes;
        int ret, i;
        u8 *key;
        unsigned int keylen;
        int round = reqctx->last_req_len / AES_BLOCK_SIZE;
        int round8 = round / 8;

        memcpy(iv, reqctx->iv, AES_BLOCK_SIZE);

        keylen = ablkctx->enckey_len / 2;
        key = ablkctx->key + keylen;
        /* For a 192 bit key remove the padded zeroes which was
         * added in chcr_xts_setkey
         */
        if (KEY_CONTEXT_CK_SIZE_G(ntohl(ablkctx->key_ctx_hdr))
                        == CHCR_KEYCTX_CIPHER_KEY_SIZE_192)
                ret = aes_expandkey(&aes, key, keylen - 8);
        else
                ret = aes_expandkey(&aes, key, keylen);
        if (ret)
                return ret;
        aes_encrypt(&aes, iv, iv);
        for (i = 0; i < round8; i++)
                gf128mul_x8_ble((le128 *)iv, (le128 *)iv);

        for (i = 0; i < (round % 8); i++)
                gf128mul_x_ble((le128 *)iv, (le128 *)iv);

        if (!isfinal)
                aes_decrypt(&aes, iv, iv);

        memzero_explicit(&aes, sizeof(aes));
        return 0;
}

static int chcr_update_cipher_iv(struct skcipher_request *req,
                                   struct cpl_fw6_pld *fw6_pld, u8 *iv)
{
        struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
        struct chcr_skcipher_req_ctx *reqctx = skcipher_request_ctx(req);
        int subtype = get_cryptoalg_subtype(tfm);
        int ret = 0;

        if (subtype == CRYPTO_ALG_SUB_TYPE_CTR)
                ctr_add_iv(iv, req->iv, (reqctx->processed /
                           AES_BLOCK_SIZE));
        else if (subtype == CRYPTO_ALG_SUB_TYPE_CTR_RFC3686)
                *(__be32 *)(reqctx->iv + CTR_RFC3686_NONCE_SIZE +
                        CTR_RFC3686_IV_SIZE) = cpu_to_be32((reqctx->processed /
                                                AES_BLOCK_SIZE) + 1);
        else if (subtype == CRYPTO_ALG_SUB_TYPE_XTS)
                ret = chcr_update_tweak(req, iv, 0);
        else if (subtype == CRYPTO_ALG_SUB_TYPE_CBC) {
                if (reqctx->op)
                        /*Updated before sending last WR*/
                        memcpy(iv, req->iv, AES_BLOCK_SIZE);
                else
                        memcpy(iv, &fw6_pld->data[2], AES_BLOCK_SIZE);
        }

        return ret;

}

/* We need separate function for final iv because in rfc3686  Initial counter
 * starts from 1 and buffer size of iv is 8 byte only which remains constant
 * for subsequent update requests
 */

static int chcr_final_cipher_iv(struct skcipher_request *req,
                                   struct cpl_fw6_pld *fw6_pld, u8 *iv)
{
        struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
        struct chcr_skcipher_req_ctx *reqctx = skcipher_request_ctx(req);
        int subtype = get_cryptoalg_subtype(tfm);
        int ret = 0;

        if (subtype == CRYPTO_ALG_SUB_TYPE_CTR)
                ctr_add_iv(iv, req->iv, DIV_ROUND_UP(reqctx->processed,
                                                       AES_BLOCK_SIZE));
        else if (subtype == CRYPTO_ALG_SUB_TYPE_XTS) {
                if (!reqctx->partial_req)
                        memcpy(iv, reqctx->iv, AES_BLOCK_SIZE);
                else
                        ret = chcr_update_tweak(req, iv, 1);
        }
        else if (subtype == CRYPTO_ALG_SUB_TYPE_CBC) {
                /*Already updated for Decrypt*/
                if (!reqctx->op)
                        memcpy(iv, &fw6_pld->data[2], AES_BLOCK_SIZE);

        }
        return ret;

}

static int chcr_handle_cipher_resp(struct skcipher_request *req,
                                   unsigned char *input, int err)
{
        struct chcr_skcipher_req_ctx *reqctx = skcipher_request_ctx(req);
        struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
        struct cpl_fw6_pld *fw6_pld = (struct cpl_fw6_pld *)input;
        struct ablk_ctx *ablkctx = ABLK_CTX(c_ctx(tfm));
        struct uld_ctx *u_ctx = ULD_CTX(c_ctx(tfm));
        struct chcr_dev *dev = c_ctx(tfm)->dev;
        struct chcr_context *ctx = c_ctx(tfm);
        struct adapter *adap = padap(ctx->dev);
        struct cipher_wr_param wrparam;
        struct sk_buff *skb;
        int bytes;

        if (err)
                goto unmap;
        if (req->cryptlen == reqctx->processed) {
                chcr_cipher_dma_unmap(&ULD_CTX(c_ctx(tfm))->lldi.pdev->dev,
                                      req);
                err = chcr_final_cipher_iv(req, fw6_pld, req->iv);
                goto complete;
        }

        if (!reqctx->imm) {
                bytes = chcr_sg_ent_in_wr(reqctx->srcsg, reqctx->dstsg, 0,
                                          CIP_SPACE_LEFT(ablkctx->enckey_len),
                                          reqctx->src_ofst, reqctx->dst_ofst);
                if ((bytes + reqctx->processed) >= req->cryptlen)
                        bytes  = req->cryptlen - reqctx->processed;
                else
                        bytes = rounddown(bytes, 16);
        } else {
                /*CTR mode counter overfloa*/
                bytes  = req->cryptlen - reqctx->processed;
        }
        err = chcr_update_cipher_iv(req, fw6_pld, reqctx->iv);
        if (err)
                goto unmap;

        if (unlikely(bytes == 0)) {
                chcr_cipher_dma_unmap(&ULD_CTX(c_ctx(tfm))->lldi.pdev->dev,
                                      req);
                memcpy(req->iv, reqctx->init_iv, IV);
                atomic_inc(&adap->chcr_stats.fallback);
                err = chcr_cipher_fallback(ablkctx->sw_cipher, req, req->iv,
                                           reqctx->op);
                goto complete;
        }

        if (get_cryptoalg_subtype(tfm) ==
            CRYPTO_ALG_SUB_TYPE_CTR)
                bytes = adjust_ctr_overflow(reqctx->iv, bytes);
        wrparam.qid = u_ctx->lldi.rxq_ids[reqctx->rxqidx];
        wrparam.req = req;
        wrparam.bytes = bytes;
        skb = create_cipher_wr(&wrparam);
        if (IS_ERR(skb)) {
                pr_err("%s : Failed to form WR. No memory\n", __func__);
                err = PTR_ERR(skb);
                goto unmap;
        }
        skb->dev = u_ctx->lldi.ports[0];
        set_wr_txq(skb, CPL_PRIORITY_DATA, reqctx->txqidx);
        chcr_send_wr(skb);
        reqctx->last_req_len = bytes;
        reqctx->processed += bytes;
        if (get_cryptoalg_subtype(tfm) ==
                CRYPTO_ALG_SUB_TYPE_CBC && req->base.flags ==
                        CRYPTO_TFM_REQ_MAY_SLEEP ) {
                complete(&ctx->cbc_aes_aio_done);
        }
        return 0;
unmap:
        chcr_cipher_dma_unmap(&ULD_CTX(c_ctx(tfm))->lldi.pdev->dev, req);
complete:
        if (get_cryptoalg_subtype(tfm) ==
                CRYPTO_ALG_SUB_TYPE_CBC && req->base.flags ==
                        CRYPTO_TFM_REQ_MAY_SLEEP ) {
                complete(&ctx->cbc_aes_aio_done);
        }
        chcr_dec_wrcount(dev);
        req->base.complete(&req->base, err);
        return err;
}

static int process_cipher(struct skcipher_request *req,
                                  unsigned short qid,
                                  struct sk_buff **skb,
                                  unsigned short op_type)
{
        struct chcr_skcipher_req_ctx *reqctx = skcipher_request_ctx(req);
        struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
        unsigned int ivsize = crypto_skcipher_ivsize(tfm);
        struct ablk_ctx *ablkctx = ABLK_CTX(c_ctx(tfm));
        struct adapter *adap = padap(c_ctx(tfm)->dev);
        struct  cipher_wr_param wrparam;
        int bytes, err = -EINVAL;
        int subtype;

        reqctx->processed = 0;
        reqctx->partial_req = 0;
        if (!req->iv)
                goto error;
        subtype = get_cryptoalg_subtype(tfm);
        if ((ablkctx->enckey_len == 0) || (ivsize > AES_BLOCK_SIZE) ||
            (req->cryptlen == 0) ||
            (req->cryptlen % crypto_skcipher_blocksize(tfm))) {
                if (req->cryptlen == 0 && subtype != CRYPTO_ALG_SUB_TYPE_XTS)
                        goto fallback;
                else if (req->cryptlen % crypto_skcipher_blocksize(tfm) &&
                         subtype == CRYPTO_ALG_SUB_TYPE_XTS)
                        goto fallback;
                pr_err("AES: Invalid value of Key Len %d nbytes %d IV Len %d\n",
                       ablkctx->enckey_len, req->cryptlen, ivsize);
                goto error;
        }

        err = chcr_cipher_dma_map(&ULD_CTX(c_ctx(tfm))->lldi.pdev->dev, req);
        if (err)
                goto error;
        if (req->cryptlen < (SGE_MAX_WR_LEN - (sizeof(struct chcr_wr) +
                                            AES_MIN_KEY_SIZE +
                                            sizeof(struct cpl_rx_phys_dsgl) +
                                        /*Min dsgl size*/
                                            32))) {
                /* Can be sent as Imm*/
                unsigned int dnents = 0, transhdr_len, phys_dsgl, kctx_len;

                dnents = sg_nents_xlen(req->dst, req->cryptlen,
                                       CHCR_DST_SG_SIZE, 0);
                phys_dsgl = get_space_for_phys_dsgl(dnents);
                kctx_len = roundup(ablkctx->enckey_len, 16);
                transhdr_len = CIPHER_TRANSHDR_SIZE(kctx_len, phys_dsgl);
                reqctx->imm = (transhdr_len + IV + req->cryptlen) <=
                        SGE_MAX_WR_LEN;
                bytes = IV + req->cryptlen;

        } else {
                reqctx->imm = 0;
        }

        if (!reqctx->imm) {
                bytes = chcr_sg_ent_in_wr(req->src, req->dst, 0,
                                          CIP_SPACE_LEFT(ablkctx->enckey_len),
                                          0, 0);
                if ((bytes + reqctx->processed) >= req->cryptlen)
                        bytes  = req->cryptlen - reqctx->processed;
                else
                        bytes = rounddown(bytes, 16);
        } else {
                bytes = req->cryptlen;
        }
        if (subtype == CRYPTO_ALG_SUB_TYPE_CTR) {
                bytes = adjust_ctr_overflow(req->iv, bytes);
        }
        if (subtype == CRYPTO_ALG_SUB_TYPE_CTR_RFC3686) {
                memcpy(reqctx->iv, ablkctx->nonce, CTR_RFC3686_NONCE_SIZE);
                memcpy(reqctx->iv + CTR_RFC3686_NONCE_SIZE, req->iv,
                                CTR_RFC3686_IV_SIZE);

                /* initialize counter portion of counter block */
                *(__be32 *)(reqctx->iv + CTR_RFC3686_NONCE_SIZE +
                        CTR_RFC3686_IV_SIZE) = cpu_to_be32(1);
                memcpy(reqctx->init_iv, reqctx->iv, IV);

        } else {

                memcpy(reqctx->iv, req->iv, IV);
                memcpy(reqctx->init_iv, req->iv, IV);
        }
        if (unlikely(bytes == 0)) {
                chcr_cipher_dma_unmap(&ULD_CTX(c_ctx(tfm))->lldi.pdev->dev,
                                      req);
fallback:       atomic_inc(&adap->chcr_stats.fallback);
                err = chcr_cipher_fallback(ablkctx->sw_cipher, req,
                                           subtype ==
                                           CRYPTO_ALG_SUB_TYPE_CTR_RFC3686 ?
                                           reqctx->iv : req->iv,
                                           op_type);
                goto error;
        }
        reqctx->op = op_type;
        reqctx->srcsg = req->src;
        reqctx->dstsg = req->dst;
        reqctx->src_ofst = 0;
        reqctx->dst_ofst = 0;
        wrparam.qid = qid;
        wrparam.req = req;
        wrparam.bytes = bytes;
        *skb = create_cipher_wr(&wrparam);
        if (IS_ERR(*skb)) {
                err = PTR_ERR(*skb);
                goto unmap;
        }
        reqctx->processed = bytes;
        reqctx->last_req_len = bytes;
        reqctx->partial_req = !!(req->cryptlen - reqctx->processed);

        return 0;
unmap:
        chcr_cipher_dma_unmap(&ULD_CTX(c_ctx(tfm))->lldi.pdev->dev, req);
error:
        return err;
}

static int chcr_aes_encrypt(struct skcipher_request *req)
{
        struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
        struct chcr_skcipher_req_ctx *reqctx = skcipher_request_ctx(req);
        struct chcr_dev *dev = c_ctx(tfm)->dev;
        struct sk_buff *skb = NULL;
        int err;
        struct uld_ctx *u_ctx = ULD_CTX(c_ctx(tfm));
        struct chcr_context *ctx = c_ctx(tfm);
        unsigned int cpu;

        cpu = get_cpu();
        reqctx->txqidx = cpu % ctx->ntxq;
        reqctx->rxqidx = cpu % ctx->nrxq;
        put_cpu();

        err = chcr_inc_wrcount(dev);
        if (err)
                return -ENXIO;
        if (unlikely(cxgb4_is_crypto_q_full(u_ctx->lldi.ports[0],
                                                reqctx->txqidx) &&
                (!(req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG)))) {
                        err = -ENOSPC;
                        goto error;
        }

        err = process_cipher(req, u_ctx->lldi.rxq_ids[reqctx->rxqidx],
                             &skb, CHCR_ENCRYPT_OP);
        if (err || !skb)
                return  err;
        skb->dev = u_ctx->lldi.ports[0];
        set_wr_txq(skb, CPL_PRIORITY_DATA, reqctx->txqidx);
        chcr_send_wr(skb);
        if (get_cryptoalg_subtype(tfm) ==
                CRYPTO_ALG_SUB_TYPE_CBC && req->base.flags ==
                        CRYPTO_TFM_REQ_MAY_SLEEP ) {
                        reqctx->partial_req = 1;
                        wait_for_completion(&ctx->cbc_aes_aio_done);
        }
        return -EINPROGRESS;
error:
        chcr_dec_wrcount(dev);
        return err;
}

static int chcr_aes_decrypt(struct skcipher_request *req)
{
        struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
        struct chcr_skcipher_req_ctx *reqctx = skcipher_request_ctx(req);
        struct uld_ctx *u_ctx = ULD_CTX(c_ctx(tfm));
        struct chcr_dev *dev = c_ctx(tfm)->dev;
        struct sk_buff *skb = NULL;
        int err;
        struct chcr_context *ctx = c_ctx(tfm);
        unsigned int cpu;

        cpu = get_cpu();
        reqctx->txqidx = cpu % ctx->ntxq;
        reqctx->rxqidx = cpu % ctx->nrxq;
        put_cpu();

        err = chcr_inc_wrcount(dev);
        if (err)
                return -ENXIO;

        if (unlikely(cxgb4_is_crypto_q_full(u_ctx->lldi.ports[0],
                                                reqctx->txqidx) &&
                (!(req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG))))
                        return -ENOSPC;
        err = process_cipher(req, u_ctx->lldi.rxq_ids[reqctx->rxqidx],
                             &skb, CHCR_DECRYPT_OP);
        if (err || !skb)
                return err;
        skb->dev = u_ctx->lldi.ports[0];
        set_wr_txq(skb, CPL_PRIORITY_DATA, reqctx->txqidx);
        chcr_send_wr(skb);
        return -EINPROGRESS;
}
static int chcr_device_init(struct chcr_context *ctx)
{
        struct uld_ctx *u_ctx = NULL;
        int txq_perchan, ntxq;
        int err = 0, rxq_perchan;

        if (!ctx->dev) {
                u_ctx = assign_chcr_device();
                if (!u_ctx) {
                        err = -ENXIO;
                        pr_err("chcr device assignment fails\n");
                        goto out;
                }
                ctx->dev = &u_ctx->dev;
                ntxq = u_ctx->lldi.ntxq;
                rxq_perchan = u_ctx->lldi.nrxq / u_ctx->lldi.nchan;
                txq_perchan = ntxq / u_ctx->lldi.nchan;
                ctx->ntxq = ntxq;
                ctx->nrxq = u_ctx->lldi.nrxq;
                ctx->rxq_perchan = rxq_perchan;
                ctx->txq_perchan = txq_perchan;
        }
out:
        return err;
}

static int chcr_init_tfm(struct crypto_skcipher *tfm)
{
        struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
        struct chcr_context *ctx = crypto_skcipher_ctx(tfm);
        struct ablk_ctx *ablkctx = ABLK_CTX(ctx);

        ablkctx->sw_cipher = crypto_alloc_skcipher(alg->base.cra_name, 0,
                                CRYPTO_ALG_NEED_FALLBACK);
        if (IS_ERR(ablkctx->sw_cipher)) {
                pr_err("failed to allocate fallback for %s\n", alg->base.cra_name);
                return PTR_ERR(ablkctx->sw_cipher);
        }
        init_completion(&ctx->cbc_aes_aio_done);
        crypto_skcipher_set_reqsize(tfm, sizeof(struct chcr_skcipher_req_ctx) +
                                         crypto_skcipher_reqsize(ablkctx->sw_cipher));

        return chcr_device_init(ctx);
}

static int chcr_rfc3686_init(struct crypto_skcipher *tfm)
{
        struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
        struct chcr_context *ctx = crypto_skcipher_ctx(tfm);
        struct ablk_ctx *ablkctx = ABLK_CTX(ctx);

        /*RFC3686 initialises IV counter value to 1, rfc3686(ctr(aes))
         * cannot be used as fallback in chcr_handle_cipher_response
         */
        ablkctx->sw_cipher = crypto_alloc_skcipher("ctr(aes)", 0,
                                CRYPTO_ALG_NEED_FALLBACK);
        if (IS_ERR(ablkctx->sw_cipher)) {
                pr_err("failed to allocate fallback for %s\n", alg->base.cra_name);
                return PTR_ERR(ablkctx->sw_cipher);
        }
        crypto_skcipher_set_reqsize(tfm, sizeof(struct chcr_skcipher_req_ctx) +
                                    crypto_skcipher_reqsize(ablkctx->sw_cipher));
        return chcr_device_init(ctx);
}


static void chcr_exit_tfm(struct crypto_skcipher *tfm)
{
        struct chcr_context *ctx = crypto_skcipher_ctx(tfm);
        struct ablk_ctx *ablkctx = ABLK_CTX(ctx);

        crypto_free_skcipher(ablkctx->sw_cipher);
}

static int get_alg_config(struct algo_param *params,
                          unsigned int auth_size)
{
        switch (auth_size) {
        case SHA1_DIGEST_SIZE:
                params->mk_size = CHCR_KEYCTX_MAC_KEY_SIZE_160;
                params->auth_mode = CHCR_SCMD_AUTH_MODE_SHA1;
                params->result_size = SHA1_DIGEST_SIZE;
                break;
        case SHA224_DIGEST_SIZE:
                params->mk_size = CHCR_KEYCTX_MAC_KEY_SIZE_256;
                params->auth_mode = CHCR_SCMD_AUTH_MODE_SHA224;
                params->result_size = SHA256_DIGEST_SIZE;
                break;
        case SHA256_DIGEST_SIZE:
                params->mk_size = CHCR_KEYCTX_MAC_KEY_SIZE_256;
                params->auth_mode = CHCR_SCMD_AUTH_MODE_SHA256;
                params->result_size = SHA256_DIGEST_SIZE;
                break;
        case SHA384_DIGEST_SIZE:
                params->mk_size = CHCR_KEYCTX_MAC_KEY_SIZE_512;
                params->auth_mode = CHCR_SCMD_AUTH_MODE_SHA512_384;
                params->result_size = SHA512_DIGEST_SIZE;
                break;
        case SHA512_DIGEST_SIZE:
                params->mk_size = CHCR_KEYCTX_MAC_KEY_SIZE_512;
                params->auth_mode = CHCR_SCMD_AUTH_MODE_SHA512_512;
                params->result_size = SHA512_DIGEST_SIZE;
                break;
        default:
                pr_err("ERROR, unsupported digest size\n");
                return -EINVAL;
        }
        return 0;
}

static inline void chcr_free_shash(struct crypto_shash *base_hash)
{
                crypto_free_shash(base_hash);
}

/**
 *      create_hash_wr - Create hash work request
 *      @req - Cipher req base
 */
static struct sk_buff *create_hash_wr(struct ahash_request *req,
                                      struct hash_wr_param *param)
{
        struct chcr_ahash_req_ctx *req_ctx = ahash_request_ctx(req);
        struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
        struct chcr_context *ctx = h_ctx(tfm);
        struct hmac_ctx *hmacctx = HMAC_CTX(ctx);
        struct sk_buff *skb = NULL;
        struct uld_ctx *u_ctx = ULD_CTX(ctx);
        struct chcr_wr *chcr_req;
        struct ulptx_sgl *ulptx;
        unsigned int nents = 0, transhdr_len;
        unsigned int temp = 0;
        gfp_t flags = req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP ? GFP_KERNEL :
                GFP_ATOMIC;
        struct adapter *adap = padap(h_ctx(tfm)->dev);
        int error = 0;
        unsigned int rx_channel_id = req_ctx->rxqidx / ctx->rxq_perchan;

        transhdr_len = HASH_TRANSHDR_SIZE(param->kctx_len);
        req_ctx->hctx_wr.imm = (transhdr_len + param->bfr_len +
                                param->sg_len) <= SGE_MAX_WR_LEN;
        nents = sg_nents_xlen(req_ctx->hctx_wr.srcsg, param->sg_len,
                      CHCR_SRC_SG_SIZE, req_ctx->hctx_wr.src_ofst);
        nents += param->bfr_len ? 1 : 0;
        transhdr_len += req_ctx->hctx_wr.imm ? roundup(param->bfr_len +
                                param->sg_len, 16) : (sgl_len(nents) * 8);
        transhdr_len = roundup(transhdr_len, 16);

        skb = alloc_skb(transhdr_len, flags);
        if (!skb)
                return ERR_PTR(-ENOMEM);
        chcr_req = __skb_put_zero(skb, transhdr_len);

        chcr_req->sec_cpl.op_ivinsrtofst =
                FILL_SEC_CPL_OP_IVINSR(rx_channel_id, 2, 0);

        chcr_req->sec_cpl.pldlen = htonl(param->bfr_len + param->sg_len);

        chcr_req->sec_cpl.aadstart_cipherstop_hi =
                FILL_SEC_CPL_CIPHERSTOP_HI(0, 0, 0, 0);
        chcr_req->sec_cpl.cipherstop_lo_authinsert =
                FILL_SEC_CPL_AUTHINSERT(0, 1, 0, 0);
        chcr_req->sec_cpl.seqno_numivs =
                FILL_SEC_CPL_SCMD0_SEQNO(0, 0, 0, param->alg_prm.auth_mode,
                                         param->opad_needed, 0);

        chcr_req->sec_cpl.ivgen_hdrlen =
                FILL_SEC_CPL_IVGEN_HDRLEN(param->last, param->more, 0, 1, 0, 0);

        memcpy(chcr_req->key_ctx.key, req_ctx->partial_hash,
               param->alg_prm.result_size);

        if (param->opad_needed)
                memcpy(chcr_req->key_ctx.key +
                       ((param->alg_prm.result_size <= 32) ? 32 :
                        CHCR_HASH_MAX_DIGEST_SIZE),
                       hmacctx->opad, param->alg_prm.result_size);

        chcr_req->key_ctx.ctx_hdr = FILL_KEY_CTX_HDR(CHCR_KEYCTX_NO_KEY,
                                            param->alg_prm.mk_size, 0,
                                            param->opad_needed,
                                            ((param->kctx_len +
                                             sizeof(chcr_req->key_ctx)) >> 4));
        chcr_req->sec_cpl.scmd1 = cpu_to_be64((u64)param->scmd1);
        ulptx = (struct ulptx_sgl *)((u8 *)(chcr_req + 1) + param->kctx_len +
                                     DUMMY_BYTES);
        if (param->bfr_len != 0) {
                req_ctx->hctx_wr.dma_addr =
                        dma_map_single(&u_ctx->lldi.pdev->dev, req_ctx->reqbfr,
                                       param->bfr_len, DMA_TO_DEVICE);
                if (dma_mapping_error(&u_ctx->lldi.pdev->dev,
                                       req_ctx->hctx_wr. dma_addr)) {
                        error = -ENOMEM;
                        goto err;
                }
                req_ctx->hctx_wr.dma_len = param->bfr_len;
        } else {
                req_ctx->hctx_wr.dma_addr = 0;
        }
        chcr_add_hash_src_ent(req, ulptx, param);
        /* Request upto max wr size */
        temp = param->kctx_len + DUMMY_BYTES + (req_ctx->hctx_wr.imm ?
                                (param->sg_len + param->bfr_len) : 0);
        atomic_inc(&adap->chcr_stats.digest_rqst);
        create_wreq(h_ctx(tfm), chcr_req, &req->base, req_ctx->hctx_wr.imm,
                    param->hash_size, transhdr_len,
                    temp,  0);
        req_ctx->hctx_wr.skb = skb;
        return skb;
err:
        kfree_skb(skb);
        return  ERR_PTR(error);
}

static int chcr_ahash_update(struct ahash_request *req)
{
        struct chcr_ahash_req_ctx *req_ctx = ahash_request_ctx(req);
        struct crypto_ahash *rtfm = crypto_ahash_reqtfm(req);
        struct uld_ctx *u_ctx = ULD_CTX(h_ctx(rtfm));
        struct chcr_context *ctx = h_ctx(rtfm);
        struct chcr_dev *dev = h_ctx(rtfm)->dev;
        struct sk_buff *skb;
        u8 remainder = 0, bs;
        unsigned int nbytes = req->nbytes;
        struct hash_wr_param params;
        int error;
        unsigned int cpu;

        cpu = get_cpu();
        req_ctx->txqidx = cpu % ctx->ntxq;
        req_ctx->rxqidx = cpu % ctx->nrxq;
        put_cpu();

        bs = crypto_tfm_alg_blocksize(crypto_ahash_tfm(rtfm));

        if (nbytes + req_ctx->reqlen >= bs) {
                remainder = (nbytes + req_ctx->reqlen) % bs;
                nbytes = nbytes + req_ctx->reqlen - remainder;
        } else {
                sg_pcopy_to_buffer(req->src, sg_nents(req->src), req_ctx->reqbfr
                                   + req_ctx->reqlen, nbytes, 0);
                req_ctx->reqlen += nbytes;
                return 0;
        }
        error = chcr_inc_wrcount(dev);
        if (error)
                return -ENXIO;
        /* Detach state for CHCR means lldi or padap is freed. Increasing
         * inflight count for dev guarantees that lldi and padap is valid
         */
        if (unlikely(cxgb4_is_crypto_q_full(u_ctx->lldi.ports[0],
                                                req_ctx->txqidx) &&
                (!(req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG)))) {
                        error = -ENOSPC;
                        goto err;
        }

        chcr_init_hctx_per_wr(req_ctx);
        error = chcr_hash_dma_map(&u_ctx->lldi.pdev->dev, req);
        if (error) {
                error = -ENOMEM;
                goto err;
        }
        get_alg_config(&params.alg_prm, crypto_ahash_digestsize(rtfm));
        params.kctx_len = roundup(params.alg_prm.result_size, 16);
        params.sg_len = chcr_hash_ent_in_wr(req->src, !!req_ctx->reqlen,
                                     HASH_SPACE_LEFT(params.kctx_len), 0);
        if (params.sg_len > req->nbytes)
                params.sg_len = req->nbytes;
        params.sg_len = rounddown(params.sg_len + req_ctx->reqlen, bs) -
                        req_ctx->reqlen;
        params.opad_needed = 0;
        params.more = 1;
        params.last = 0;
        params.bfr_len = req_ctx->reqlen;
        params.scmd1 = 0;
        req_ctx->hctx_wr.srcsg = req->src;

        params.hash_size = params.alg_prm.result_size;
        req_ctx->data_len += params.sg_len + params.bfr_len;
        skb = create_hash_wr(req, &params);
        if (IS_ERR(skb)) {
                error = PTR_ERR(skb);
                goto unmap;
        }

        req_ctx->hctx_wr.processed += params.sg_len;
        if (remainder) {
                /* Swap buffers */
                swap(req_ctx->reqbfr, req_ctx->skbfr);
                sg_pcopy_to_buffer(req->src, sg_nents(req->src),
                                   req_ctx->reqbfr, remainder, req->nbytes -
                                   remainder);
        }
        req_ctx->reqlen = remainder;
        skb->dev = u_ctx->lldi.ports[0];
        set_wr_txq(skb, CPL_PRIORITY_DATA, req_ctx->txqidx);
        chcr_send_wr(skb);
        return -EINPROGRESS;
unmap:
        chcr_hash_dma_unmap(&u_ctx->lldi.pdev->dev, req);
err:
        chcr_dec_wrcount(dev);
        return error;
}

static void create_last_hash_block(char *bfr_ptr, unsigned int bs, u64 scmd1)
{
        memset(bfr_ptr, 0, bs);
        *bfr_ptr = 0x80;
        if (bs == 64)
                *(__be64 *)(bfr_ptr + 56) = cpu_to_be64(scmd1  << 3);
        else
                *(__be64 *)(bfr_ptr + 120) =  cpu_to_be64(scmd1  << 3);
}

static int chcr_ahash_final(struct ahash_request *req)
{
        struct chcr_ahash_req_ctx *req_ctx = ahash_request_ctx(req);
        struct crypto_ahash *rtfm = crypto_ahash_reqtfm(req);
        struct chcr_dev *dev = h_ctx(rtfm)->dev;
        struct hash_wr_param params;
        struct sk_buff *skb;
        struct uld_ctx *u_ctx = ULD_CTX(h_ctx(rtfm));
        struct chcr_context *ctx = h_ctx(rtfm);
        u8 bs = crypto_tfm_alg_blocksize(crypto_ahash_tfm(rtfm));
        int error;
        unsigned int cpu;

        cpu = get_cpu();
        req_ctx->txqidx = cpu % ctx->ntxq;
        req_ctx->rxqidx = cpu % ctx->nrxq;
        put_cpu();

        error = chcr_inc_wrcount(dev);
        if (error)
                return -ENXIO;

        chcr_init_hctx_per_wr(req_ctx);
        if (is_hmac(crypto_ahash_tfm(rtfm)))
                params.opad_needed = 1;
        else
                params.opad_needed = 0;
        params.sg_len = 0;
        req_ctx->hctx_wr.isfinal = 1;
        get_alg_config(&params.alg_prm, crypto_ahash_digestsize(rtfm));
        params.kctx_len = roundup(params.alg_prm.result_size, 16);
        if (is_hmac(crypto_ahash_tfm(rtfm))) {
                params.opad_needed = 1;
                params.kctx_len *= 2;
        } else {
                params.opad_needed = 0;
        }

        req_ctx->hctx_wr.result = 1;
        params.bfr_len = req_ctx->reqlen;
        req_ctx->data_len += params.bfr_len + params.sg_len;
        req_ctx->hctx_wr.srcsg = req->src;
        if (req_ctx->reqlen == 0) {
                create_last_hash_block(req_ctx->reqbfr, bs, req_ctx->data_len);
                params.last = 0;
                params.more = 1;
                params.scmd1 = 0;
                params.bfr_len = bs;

        } else {
                params.scmd1 = req_ctx->data_len;
                params.last = 1;
                params.more = 0;
        }
        params.hash_size = crypto_ahash_digestsize(rtfm);
        skb = create_hash_wr(req, &params);
        if (IS_ERR(skb)) {
                error = PTR_ERR(skb);
                goto err;
        }
        req_ctx->reqlen = 0;
        skb->dev = u_ctx->lldi.ports[0];
        set_wr_txq(skb, CPL_PRIORITY_DATA, req_ctx->txqidx);
        chcr_send_wr(skb);
        return -EINPROGRESS;
err:
        chcr_dec_wrcount(dev);
        return error;
}

static int chcr_ahash_finup(struct ahash_request *req)
{
        struct chcr_ahash_req_ctx *req_ctx = ahash_request_ctx(req);
        struct crypto_ahash *rtfm = crypto_ahash_reqtfm(req);
        struct chcr_dev *dev = h_ctx(rtfm)->dev;
        struct uld_ctx *u_ctx = ULD_CTX(h_ctx(rtfm));
        struct chcr_context *ctx = h_ctx(rtfm);
        struct sk_buff *skb;
        struct hash_wr_param params;
        u8  bs;
        int error;
        unsigned int cpu;

        cpu = get_cpu();
        req_ctx->txqidx = cpu % ctx->ntxq;
        req_ctx->rxqidx = cpu % ctx->nrxq;
        put_cpu();

        bs = crypto_tfm_alg_blocksize(crypto_ahash_tfm(rtfm));
        error = chcr_inc_wrcount(dev);
        if (error)
                return -ENXIO;

        if (unlikely(cxgb4_is_crypto_q_full(u_ctx->lldi.ports[0],
                                                req_ctx->txqidx) &&
                (!(req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG)))) {
                        error = -ENOSPC;
                        goto err;
        }
        chcr_init_hctx_per_wr(req_ctx);
        error = chcr_hash_dma_map(&u_ctx->lldi.pdev->dev, req);
        if (error) {
                error = -ENOMEM;
                goto err;
        }

        get_alg_config(&params.alg_prm, crypto_ahash_digestsize(rtfm));
        params.kctx_len = roundup(params.alg_prm.result_size, 16);
        if (is_hmac(crypto_ahash_tfm(rtfm))) {
                params.kctx_len *= 2;
                params.opad_needed = 1;
        } else {
                params.opad_needed = 0;
        }

        params.sg_len = chcr_hash_ent_in_wr(req->src, !!req_ctx->reqlen,
                                    HASH_SPACE_LEFT(params.kctx_len), 0);
        if (params.sg_len < req->nbytes) {
                if (is_hmac(crypto_ahash_tfm(rtfm))) {
                        params.kctx_len /= 2;
                        params.opad_needed = 0;
                }
                params.last = 0;
                params.more = 1;
                params.sg_len = rounddown(params.sg_len + req_ctx->reqlen, bs)
                                        - req_ctx->reqlen;
                params.hash_size = params.alg_prm.result_size;
                params.scmd1 = 0;
        } else {
                params.last = 1;
                params.more = 0;
                params.sg_len = req->nbytes;
                params.hash_size = crypto_ahash_digestsize(rtfm);
                params.scmd1 = req_ctx->data_len + req_ctx->reqlen +
                                params.sg_len;
        }
        params.bfr_len = req_ctx->reqlen;
        req_ctx->data_len += params.bfr_len + params.sg_len;
        req_ctx->hctx_wr.result = 1;
        req_ctx->hctx_wr.srcsg = req->src;
        if ((req_ctx->reqlen + req->nbytes) == 0) {
                create_last_hash_block(req_ctx->reqbfr, bs, req_ctx->data_len);
                params.last = 0;
                params.more = 1;
                params.scmd1 = 0;
                params.bfr_len = bs;
        }
        skb = create_hash_wr(req, &params);
        if (IS_ERR(skb)) {
                error = PTR_ERR(skb);
                goto unmap;
        }
        req_ctx->reqlen = 0;
        req_ctx->hctx_wr.processed += params.sg_len;
        skb->dev = u_ctx->lldi.ports[0];
        set_wr_txq(skb, CPL_PRIORITY_DATA, req_ctx->txqidx);
        chcr_send_wr(skb);
        return -EINPROGRESS;
unmap:
        chcr_hash_dma_unmap(&u_ctx->lldi.pdev->dev, req);
err:
        chcr_dec_wrcount(dev);
        return error;
}

static int chcr_ahash_digest(struct ahash_request *req)
{
        struct chcr_ahash_req_ctx *req_ctx = ahash_request_ctx(req);
        struct crypto_ahash *rtfm = crypto_ahash_reqtfm(req);
        struct chcr_dev *dev = h_ctx(rtfm)->dev;
        struct uld_ctx *u_ctx = ULD_CTX(h_ctx(rtfm));
        struct chcr_context *ctx = h_ctx(rtfm);
        struct sk_buff *skb;
        struct hash_wr_param params;
        u8  bs;
        int error;
        unsigned int cpu;

        cpu = get_cpu();
        req_ctx->txqidx = cpu % ctx->ntxq;
        req_ctx->rxqidx = cpu % ctx->nrxq;
        put_cpu();

        rtfm->init(req);
        bs = crypto_tfm_alg_blocksize(crypto_ahash_tfm(rtfm));
        error = chcr_inc_wrcount(dev);
        if (error)
                return -ENXIO;

        if (unlikely(cxgb4_is_crypto_q_full(u_ctx->lldi.ports[0],
                                                req_ctx->txqidx) &&
                (!(req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG)))) {
                        error = -ENOSPC;
                        goto err;
        }

        chcr_init_hctx_per_wr(req_ctx);
        error = chcr_hash_dma_map(&u_ctx->lldi.pdev->dev, req);
        if (error) {
                error = -ENOMEM;
                goto err;
        }

        get_alg_config(&params.alg_prm, crypto_ahash_digestsize(rtfm));
        params.kctx_len = roundup(params.alg_prm.result_size, 16);
        if (is_hmac(crypto_ahash_tfm(rtfm))) {
                params.kctx_len *= 2;
                params.opad_needed = 1;
        } else {
                params.opad_needed = 0;
        }
        params.sg_len = chcr_hash_ent_in_wr(req->src, !!req_ctx->reqlen,
                                HASH_SPACE_LEFT(params.kctx_len), 0);
        if (params.sg_len < req->nbytes) {
                if (is_hmac(crypto_ahash_tfm(rtfm))) {
                        params.kctx_len /= 2;
                        params.opad_needed = 0;
                }
                params.last = 0;
                params.more = 1;
                params.scmd1 = 0;
                params.sg_len = rounddown(params.sg_len, bs);
                params.hash_size = params.alg_prm.result_size;
        } else {
                params.sg_len = req->nbytes;
                params.hash_size = crypto_ahash_digestsize(rtfm);
                params.last = 1;
                params.more = 0;
                params.scmd1 = req->nbytes + req_ctx->data_len;

        }
        params.bfr_len = 0;
        req_ctx->hctx_wr.result = 1;
        req_ctx->hctx_wr.srcsg = req->src;
        req_ctx->data_len += params.bfr_len + params.sg_len;

        if (req->nbytes == 0) {
                create_last_hash_block(req_ctx->reqbfr, bs, req_ctx->data_len);
                params.more = 1;
                params.bfr_len = bs;
        }

        skb = create_hash_wr(req, &params);
        if (IS_ERR(skb)) {
                error = PTR_ERR(skb);
                goto unmap;
        }
        req_ctx->hctx_wr.processed += params.sg_len;
        skb->dev = u_ctx->lldi.ports[0];
        set_wr_txq(skb, CPL_PRIORITY_DATA, req_ctx->txqidx);
        chcr_send_wr(skb);
        return -EINPROGRESS;
unmap:
        chcr_hash_dma_unmap(&u_ctx->lldi.pdev->dev, req);
err:
        chcr_dec_wrcount(dev);
        return error;
}

static int chcr_ahash_continue(struct ahash_request *req)
{
        struct chcr_ahash_req_ctx *reqctx = ahash_request_ctx(req);
        struct chcr_hctx_per_wr *hctx_wr = &reqctx->hctx_wr;
        struct crypto_ahash *rtfm = crypto_ahash_reqtfm(req);
        struct chcr_context *ctx = h_ctx(rtfm);
        struct uld_ctx *u_ctx = ULD_CTX(ctx);
        struct sk_buff *skb;
        struct hash_wr_param params;
        u8  bs;
        int error;
        unsigned int cpu;

        cpu = get_cpu();
        reqctx->txqidx = cpu % ctx->ntxq;
        reqctx->rxqidx = cpu % ctx->nrxq;
        put_cpu();

        bs = crypto_tfm_alg_blocksize(crypto_ahash_tfm(rtfm));
        get_alg_config(&params.alg_prm, crypto_ahash_digestsize(rtfm));
        params.kctx_len = roundup(params.alg_prm.result_size, 16);
        if (is_hmac(crypto_ahash_tfm(rtfm))) {
                params.kctx_len *= 2;
                params.opad_needed = 1;
        } else {
                params.opad_needed = 0;
        }
        params.sg_len = chcr_hash_ent_in_wr(hctx_wr->srcsg, 0,
                                            HASH_SPACE_LEFT(params.kctx_len),
                                            hctx_wr->src_ofst);
        if ((params.sg_len + hctx_wr->processed) > req->nbytes)
                params.sg_len = req->nbytes - hctx_wr->processed;
        if (!hctx_wr->result ||
            ((params.sg_len + hctx_wr->processed) < req->nbytes)) {
                if (is_hmac(crypto_ahash_tfm(rtfm))) {
                        params.kctx_len /= 2;
                        params.opad_needed = 0;
                }
                params.last = 0;
                params.more = 1;
                params.sg_len = rounddown(params.sg_len, bs);
                params.hash_size = params.alg_prm.result_size;
                params.scmd1 = 0;
        } else {
                params.last = 1;
                params.more = 0;
                params.hash_size = crypto_ahash_digestsize(rtfm);
                params.scmd1 = reqctx->data_len + params.sg_len;
        }
        params.bfr_len = 0;
        reqctx->data_len += params.sg_len;
        skb = create_hash_wr(req, &params);
        if (IS_ERR(skb)) {
                error = PTR_ERR(skb);
                goto err;
        }
        hctx_wr->processed += params.sg_len;
        skb->dev = u_ctx->lldi.ports[0];
        set_wr_txq(skb, CPL_PRIORITY_DATA, reqctx->txqidx);
        chcr_send_wr(skb);
        return 0;
err:
        return error;
}

static inline void chcr_handle_ahash_resp(struct ahash_request *req,
                                          unsigned char *input,
                                          int err)
{
        struct chcr_ahash_req_ctx *reqctx = ahash_request_ctx(req);
        struct chcr_hctx_per_wr *hctx_wr = &reqctx->hctx_wr;
        int digestsize, updated_digestsize;
        struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
        struct uld_ctx *u_ctx = ULD_CTX(h_ctx(tfm));
        struct chcr_dev *dev = h_ctx(tfm)->dev;

        if (input == NULL)
                goto out;
        digestsize = crypto_ahash_digestsize(crypto_ahash_reqtfm(req));
        updated_digestsize = digestsize;
        if (digestsize == SHA224_DIGEST_SIZE)
                updated_digestsize = SHA256_DIGEST_SIZE;
        else if (digestsize == SHA384_DIGEST_SIZE)
                updated_digestsize = SHA512_DIGEST_SIZE;

        if (hctx_wr->dma_addr) {
                dma_unmap_single(&u_ctx->lldi.pdev->dev, hctx_wr->dma_addr,
                                 hctx_wr->dma_len, DMA_TO_DEVICE);
                hctx_wr->dma_addr = 0;
        }
        if (hctx_wr->isfinal || ((hctx_wr->processed + reqctx->reqlen) ==
                                 req->nbytes)) {
                if (hctx_wr->result == 1) {
                        hctx_wr->result = 0;
                        memcpy(req->result, input + sizeof(struct cpl_fw6_pld),
                               digestsize);
                } else {
                        memcpy(reqctx->partial_hash,
                               input + sizeof(struct cpl_fw6_pld),
                               updated_digestsize);

                }
                goto unmap;
        }
        memcpy(reqctx->partial_hash, input + sizeof(struct cpl_fw6_pld),
               updated_digestsize);

        err = chcr_ahash_continue(req);
        if (err)
                goto unmap;
        return;
unmap:
        if (hctx_wr->is_sg_map)
                chcr_hash_dma_unmap(&u_ctx->lldi.pdev->dev, req);


out:
        chcr_dec_wrcount(dev);
        req->base.complete(&req->base, err);
}

/*
 *      chcr_handle_resp - Unmap the DMA buffers associated with the request
 *      @req: crypto request
 */
int chcr_handle_resp(struct crypto_async_request *req, unsigned char *input,
                         int err)
{
        struct crypto_tfm *tfm = req->tfm;
        struct chcr_context *ctx = crypto_tfm_ctx(tfm);
        struct adapter *adap = padap(ctx->dev);

        switch (tfm->__crt_alg->cra_flags & CRYPTO_ALG_TYPE_MASK) {
        case CRYPTO_ALG_TYPE_AEAD:
                err = chcr_handle_aead_resp(aead_request_cast(req), input, err);
                break;

        case CRYPTO_ALG_TYPE_SKCIPHER:
                 chcr_handle_cipher_resp(skcipher_request_cast(req),
                                               input, err);
                break;
        case CRYPTO_ALG_TYPE_AHASH:
                chcr_handle_ahash_resp(ahash_request_cast(req), input, err);
                }
        atomic_inc(&adap->chcr_stats.complete);
        return err;
}
static int chcr_ahash_export(struct ahash_request *areq, void *out)
{
        struct chcr_ahash_req_ctx *req_ctx = ahash_request_ctx(areq);
        struct chcr_ahash_req_ctx *state = out;

        state->reqlen = req_ctx->reqlen;
        state->data_len = req_ctx->data_len;
        memcpy(state->bfr1, req_ctx->reqbfr, req_ctx->reqlen);
        memcpy(state->partial_hash, req_ctx->partial_hash,
               CHCR_HASH_MAX_DIGEST_SIZE);
        chcr_init_hctx_per_wr(state);
        return 0;
}

static int chcr_ahash_import(struct ahash_request *areq, const void *in)
{
        struct chcr_ahash_req_ctx *req_ctx = ahash_request_ctx(areq);
        struct chcr_ahash_req_ctx *state = (struct chcr_ahash_req_ctx *)in;

        req_ctx->reqlen = state->reqlen;
        req_ctx->data_len = state->data_len;
        req_ctx->reqbfr = req_ctx->bfr1;
        req_ctx->skbfr = req_ctx->bfr2;
        memcpy(req_ctx->bfr1, state->bfr1, CHCR_HASH_MAX_BLOCK_SIZE_128);
        memcpy(req_ctx->partial_hash, state->partial_hash,
               CHCR_HASH_MAX_DIGEST_SIZE);
        chcr_init_hctx_per_wr(req_ctx);
        return 0;
}

static int chcr_ahash_setkey(struct crypto_ahash *tfm, const u8 *key,
                             unsigned int keylen)
{
        struct hmac_ctx *hmacctx = HMAC_CTX(h_ctx(tfm));
        unsigned int digestsize = crypto_ahash_digestsize(tfm);
        unsigned int bs = crypto_tfm_alg_blocksize(crypto_ahash_tfm(tfm));
        unsigned int i, err = 0, updated_digestsize;

        SHASH_DESC_ON_STACK(shash, hmacctx->base_hash);

        /* use the key to calculate the ipad and opad. ipad will sent with the
         * first request's data. opad will be sent with the final hash result
         * ipad in hmacctx->ipad and opad in hmacctx->opad location
         */
        shash->tfm = hmacctx->base_hash;
        if (keylen > bs) {
                err = crypto_shash_digest(shash, key, keylen,
                                          hmacctx->ipad);
                if (err)
                        goto out;
                keylen = digestsize;
        } else {
                memcpy(hmacctx->ipad, key, keylen);
        }
        memset(hmacctx->ipad + keylen, 0, bs - keylen);
        memcpy(hmacctx->opad, hmacctx->ipad, bs);

        for (i = 0; i < bs / sizeof(int); i++) {
                *((unsigned int *)(&hmacctx->ipad) + i) ^= IPAD_DATA;
                *((unsigned int *)(&hmacctx->opad) + i) ^= OPAD_DATA;
        }

        updated_digestsize = digestsize;
        if (digestsize == SHA224_DIGEST_SIZE)
                updated_digestsize = SHA256_DIGEST_SIZE;
        else if (digestsize == SHA384_DIGEST_SIZE)
                updated_digestsize = SHA512_DIGEST_SIZE;
        err = chcr_compute_partial_hash(shash, hmacctx->ipad,
                                        hmacctx->ipad, digestsize);
        if (err)
                goto out;
        chcr_change_order(hmacctx->ipad, updated_digestsize);

        err = chcr_compute_partial_hash(shash, hmacctx->opad,
                                        hmacctx->opad, digestsize);
        if (err)
                goto out;
        chcr_change_order(hmacctx->opad, updated_digestsize);
out:
        return err;
}

static int chcr_aes_xts_setkey(struct crypto_skcipher *cipher, const u8 *key,
                               unsigned int key_len)
{
        struct ablk_ctx *ablkctx = ABLK_CTX(c_ctx(cipher));
        unsigned short context_size = 0;
        int err;

        err = chcr_cipher_fallback_setkey(cipher, key, key_len);
        if (err)
                goto badkey_err;

        memcpy(ablkctx->key, key, key_len);
        ablkctx->enckey_len = key_len;
        get_aes_decrypt_key(ablkctx->rrkey, ablkctx->key, key_len << 2);
        context_size = (KEY_CONTEXT_HDR_SALT_AND_PAD + key_len) >> 4;
        /* Both keys for xts must be aligned to 16 byte boundary
         * by padding with zeros. So for 24 byte keys padding 8 zeroes.
         */
        if (key_len == 48) {
                context_size = (KEY_CONTEXT_HDR_SALT_AND_PAD + key_len
                                + 16) >> 4;
                memmove(ablkctx->key + 32, ablkctx->key + 24, 24);
                memset(ablkctx->key + 24, 0, 8);
                memset(ablkctx->key + 56, 0, 8);
                ablkctx->enckey_len = 64;
                ablkctx->key_ctx_hdr =
                        FILL_KEY_CTX_HDR(CHCR_KEYCTX_CIPHER_KEY_SIZE_192,
                                         CHCR_KEYCTX_NO_KEY, 1,
                                         0, context_size);
        } else {
                ablkctx->key_ctx_hdr =
                FILL_KEY_CTX_HDR((key_len == AES_KEYSIZE_256) ?
                                 CHCR_KEYCTX_CIPHER_KEY_SIZE_128 :
                                 CHCR_KEYCTX_CIPHER_KEY_SIZE_256,
                                 CHCR_KEYCTX_NO_KEY, 1,
                                 0, context_size);
        }
        ablkctx->ciph_mode = CHCR_SCMD_CIPHER_MODE_AES_XTS;
        return 0;
badkey_err:
        ablkctx->enckey_len = 0;

        return err;
}

static int chcr_sha_init(struct ahash_request *areq)
{
        struct chcr_ahash_req_ctx *req_ctx = ahash_request_ctx(areq);
        struct crypto_ahash *tfm = crypto_ahash_reqtfm(areq);
        int digestsize =  crypto_ahash_digestsize(tfm);

        req_ctx->data_len = 0;
        req_ctx->reqlen = 0;
        req_ctx->reqbfr = req_ctx->bfr1;
        req_ctx->skbfr = req_ctx->bfr2;
        copy_hash_init_values(req_ctx->partial_hash, digestsize);

        return 0;
}

static int chcr_sha_cra_init(struct crypto_tfm *tfm)
{
        crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
                                 sizeof(struct chcr_ahash_req_ctx));
        return chcr_device_init(crypto_tfm_ctx(tfm));
}

static int chcr_hmac_init(struct ahash_request *areq)
{
        struct chcr_ahash_req_ctx *req_ctx = ahash_request_ctx(areq);
        struct crypto_ahash *rtfm = crypto_ahash_reqtfm(areq);
        struct hmac_ctx *hmacctx = HMAC_CTX(h_ctx(rtfm));
        unsigned int digestsize = crypto_ahash_digestsize(rtfm);
        unsigned int bs = crypto_tfm_alg_blocksize(crypto_ahash_tfm(rtfm));

        chcr_sha_init(areq);
        req_ctx->data_len = bs;
        if (is_hmac(crypto_ahash_tfm(rtfm))) {
                if (digestsize == SHA224_DIGEST_SIZE)
                        memcpy(req_ctx->partial_hash, hmacctx->ipad,
                               SHA256_DIGEST_SIZE);
                else if (digestsize == SHA384_DIGEST_SIZE)
                        memcpy(req_ctx->partial_hash, hmacctx->ipad,
                               SHA512_DIGEST_SIZE);
                else
                        memcpy(req_ctx->partial_hash, hmacctx->ipad,
                               digestsize);
        }
        return 0;
}

static int chcr_hmac_cra_init(struct crypto_tfm *tfm)
{
        struct chcr_context *ctx = crypto_tfm_ctx(tfm);
        struct hmac_ctx *hmacctx = HMAC_CTX(ctx);
        unsigned int digestsize =
                crypto_ahash_digestsize(__crypto_ahash_cast(tfm));

        crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
                                 sizeof(struct chcr_ahash_req_ctx));
        hmacctx->base_hash = chcr_alloc_shash(digestsize);
        if (IS_ERR(hmacctx->base_hash))
                return PTR_ERR(hmacctx->base_hash);
        return chcr_device_init(crypto_tfm_ctx(tfm));
}

static void chcr_hmac_cra_exit(struct crypto_tfm *tfm)
{
        struct chcr_context *ctx = crypto_tfm_ctx(tfm);
        struct hmac_ctx *hmacctx = HMAC_CTX(ctx);

        if (hmacctx->base_hash) {
                chcr_free_shash(hmacctx->base_hash);
                hmacctx->base_hash = NULL;
        }
}

inline void chcr_aead_common_exit(struct aead_request *req)
{
        struct chcr_aead_reqctx  *reqctx = aead_request_ctx(req);
        struct crypto_aead *tfm = crypto_aead_reqtfm(req);
        struct uld_ctx *u_ctx = ULD_CTX(a_ctx(tfm));

        chcr_aead_dma_unmap(&u_ctx->lldi.pdev->dev, req, reqctx->op);
}

static int chcr_aead_common_init(struct aead_request *req)
{
        struct crypto_aead *tfm = crypto_aead_reqtfm(req);
        struct chcr_aead_ctx *aeadctx = AEAD_CTX(a_ctx(tfm));
        struct chcr_aead_reqctx  *reqctx = aead_request_ctx(req);
        unsigned int authsize = crypto_aead_authsize(tfm);
        int error = -EINVAL;

        /* validate key size */
        if (aeadctx->enckey_len == 0)
                goto err;
        if (reqctx->op && req->cryptlen < authsize)
                goto err;
        if (reqctx->b0_len)
                reqctx->scratch_pad = reqctx->iv + IV;
        else
                reqctx->scratch_pad = NULL;

        error = chcr_aead_dma_map(&ULD_CTX(a_ctx(tfm))->lldi.pdev->dev, req,
                                  reqctx->op);
        if (error) {
                error = -ENOMEM;
                goto err;
        }

        return 0;
err:
        return error;
}

static int chcr_aead_need_fallback(struct aead_request *req, int dst_nents,
                                   int aadmax, int wrlen,
                                   unsigned short op_type)
{
        unsigned int authsize = crypto_aead_authsize(crypto_aead_reqtfm(req));

        if (((req->cryptlen - (op_type ? authsize : 0)) == 0) ||
            dst_nents > MAX_DSGL_ENT ||
            (req->assoclen > aadmax) ||
            (wrlen > SGE_MAX_WR_LEN))
                return 1;
        return 0;
}

static int chcr_aead_fallback(struct aead_request *req, unsigned short op_type)
{
        struct crypto_aead *tfm = crypto_aead_reqtfm(req);
        struct chcr_aead_ctx *aeadctx = AEAD_CTX(a_ctx(tfm));
        struct aead_request *subreq = aead_request_ctx(req);

        aead_request_set_tfm(subreq, aeadctx->sw_cipher);
        aead_request_set_callback(subreq, req->base.flags,
                                  req->base.complete, req->base.data);
        aead_request_set_crypt(subreq, req->src, req->dst, req->cryptlen,
                                 req->iv);
        aead_request_set_ad(subreq, req->assoclen);
        return op_type ? crypto_aead_decrypt(subreq) :
                crypto_aead_encrypt(subreq);
}

static struct sk_buff *create_authenc_wr(struct aead_request *req,
                                         unsigned short qid,
                                         int size)
{
        struct crypto_aead *tfm = crypto_aead_reqtfm(req);
        struct chcr_context *ctx = a_ctx(tfm);
        struct chcr_aead_ctx *aeadctx = AEAD_CTX(ctx);
        struct chcr_authenc_ctx *actx = AUTHENC_CTX(aeadctx);
        struct chcr_aead_reqctx *reqctx = aead_request_ctx(req);
        struct sk_buff *skb = NULL;
        struct chcr_wr *chcr_req;
        struct cpl_rx_phys_dsgl *phys_cpl;
        struct ulptx_sgl *ulptx;
        unsigned int transhdr_len;
        unsigned int dst_size = 0, temp, subtype = get_aead_subtype(tfm);
        unsigned int   kctx_len = 0, dnents, snents;
        unsigned int  authsize = crypto_aead_authsize(tfm);
        int error = -EINVAL;
        u8 *ivptr;
        int null = 0;
        gfp_t flags = req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP ? GFP_KERNEL :
                GFP_ATOMIC;
        struct adapter *adap = padap(ctx->dev);
        unsigned int rx_channel_id = reqctx->rxqidx / ctx->rxq_perchan;

        if (req->cryptlen == 0)
                return NULL;

        reqctx->b0_len = 0;
        error = chcr_aead_common_init(req);
        if (error)
                return ERR_PTR(error);

        if (subtype == CRYPTO_ALG_SUB_TYPE_CBC_NULL ||
                subtype == CRYPTO_ALG_SUB_TYPE_CTR_NULL) {
                null = 1;
        }
        dnents = sg_nents_xlen(req->dst, req->assoclen + req->cryptlen +
                (reqctx->op ? -authsize : authsize), CHCR_DST_SG_SIZE, 0);
        dnents += MIN_AUTH_SG; // For IV
        snents = sg_nents_xlen(req->src, req->assoclen + req->cryptlen,
                               CHCR_SRC_SG_SIZE, 0);
        dst_size = get_space_for_phys_dsgl(dnents);
        kctx_len = (KEY_CONTEXT_CTX_LEN_G(ntohl(aeadctx->key_ctx_hdr)) << 4)
                - sizeof(chcr_req->key_ctx);
        transhdr_len = CIPHER_TRANSHDR_SIZE(kctx_len, dst_size);
        reqctx->imm = (transhdr_len + req->assoclen + req->cryptlen) <
                        SGE_MAX_WR_LEN;
        temp = reqctx->imm ? roundup(req->assoclen + req->cryptlen, 16)
                        : (sgl_len(snents) * 8);
        transhdr_len += temp;
        transhdr_len = roundup(transhdr_len, 16);

        if (chcr_aead_need_fallback(req, dnents, T6_MAX_AAD_SIZE,
                                    transhdr_len, reqctx->op)) {
                atomic_inc(&adap->chcr_stats.fallback);
                chcr_aead_common_exit(req);
                return ERR_PTR(chcr_aead_fallback(req, reqctx->op));
        }
        skb = alloc_skb(transhdr_len, flags);
        if (!skb) {
                error = -ENOMEM;
                goto err;
        }

        chcr_req = __skb_put_zero(skb, transhdr_len);

        temp  = (reqctx->op == CHCR_ENCRYPT_OP) ? 0 : authsize;

        /*
         * Input order  is AAD,IV and Payload. where IV should be included as
         * the part of authdata. All other fields should be filled according
         * to the hardware spec
         */
        chcr_req->sec_cpl.op_ivinsrtofst =
                                FILL_SEC_CPL_OP_IVINSR(rx_channel_id, 2, 1);
        chcr_req->sec_cpl.pldlen = htonl(req->assoclen + IV + req->cryptlen);
        chcr_req->sec_cpl.aadstart_cipherstop_hi = FILL_SEC_CPL_CIPHERSTOP_HI(
                                        null ? 0 : 1 + IV,
                                        null ? 0 : IV + req->assoclen,
                                        req->assoclen + IV + 1,
                                        (temp & 0x1F0) >> 4);
        chcr_req->sec_cpl.cipherstop_lo_authinsert = FILL_SEC_CPL_AUTHINSERT(
                                        temp & 0xF,
                                        null ? 0 : req->assoclen + IV + 1,
                                        temp, temp);
        if (subtype == CRYPTO_ALG_SUB_TYPE_CTR_NULL ||
            subtype == CRYPTO_ALG_SUB_TYPE_CTR_SHA)
                temp = CHCR_SCMD_CIPHER_MODE_AES_CTR;
        else
                temp = CHCR_SCMD_CIPHER_MODE_AES_CBC;
        chcr_req->sec_cpl.seqno_numivs = FILL_SEC_CPL_SCMD0_SEQNO(reqctx->op,
                                        (reqctx->op == CHCR_ENCRYPT_OP) ? 1 : 0,
                                        temp,
                                        actx->auth_mode, aeadctx->hmac_ctrl,
                                        IV >> 1);
        chcr_req->sec_cpl.ivgen_hdrlen =  FILL_SEC_CPL_IVGEN_HDRLEN(0, 0, 1,
                                         0, 0, dst_size);

        chcr_req->key_ctx.ctx_hdr = aeadctx->key_ctx_hdr;
        if (reqctx->op == CHCR_ENCRYPT_OP ||
                subtype == CRYPTO_ALG_SUB_TYPE_CTR_SHA ||
                subtype == CRYPTO_ALG_SUB_TYPE_CTR_NULL)
                memcpy(chcr_req->key_ctx.key, aeadctx->key,
                       aeadctx->enckey_len);
        else
                memcpy(chcr_req->key_ctx.key, actx->dec_rrkey,
                       aeadctx->enckey_len);

        memcpy(chcr_req->key_ctx.key + roundup(aeadctx->enckey_len, 16),
               actx->h_iopad, kctx_len - roundup(aeadctx->enckey_len, 16));
        phys_cpl = (struct cpl_rx_phys_dsgl *)((u8 *)(chcr_req + 1) + kctx_len);
        ivptr = (u8 *)(phys_cpl + 1) + dst_size;
        ulptx = (struct ulptx_sgl *)(ivptr + IV);
        if (subtype == CRYPTO_ALG_SUB_TYPE_CTR_SHA ||
            subtype == CRYPTO_ALG_SUB_TYPE_CTR_NULL) {
                memcpy(ivptr, aeadctx->nonce, CTR_RFC3686_NONCE_SIZE);
                memcpy(ivptr + CTR_RFC3686_NONCE_SIZE, req->iv,
                                CTR_RFC3686_IV_SIZE);
                *(__be32 *)(ivptr + CTR_RFC3686_NONCE_SIZE +
                        CTR_RFC3686_IV_SIZE) = cpu_to_be32(1);
        } else {
                memcpy(ivptr, req->iv, IV);
        }
        chcr_add_aead_dst_ent(req, phys_cpl, qid);
        chcr_add_aead_src_ent(req, ulptx);
        atomic_inc(&adap->chcr_stats.cipher_rqst);
        temp = sizeof(struct cpl_rx_phys_dsgl) + dst_size + IV +
                kctx_len + (reqctx->imm ? (req->assoclen + req->cryptlen) : 0);
        create_wreq(a_ctx(tfm), chcr_req, &req->base, reqctx->imm, size,
                   transhdr_len, temp, 0);
        reqctx->skb = skb;

        return skb;
err:
        chcr_aead_common_exit(req);

        return ERR_PTR(error);
}

int chcr_aead_dma_map(struct device *dev,
                      struct aead_request *req,
                      unsigned short op_type)
{
        int error;
        struct chcr_aead_reqctx  *reqctx = aead_request_ctx(req);
        struct crypto_aead *tfm = crypto_aead_reqtfm(req);
        unsigned int authsize = crypto_aead_authsize(tfm);
        int src_len, dst_len;

        /* calculate and handle src and dst sg length separately
         * for inplace and out-of place operations
         */
        if (req->src == req->dst) {
                src_len = req->assoclen + req->cryptlen + (op_type ?
                                                        0 : authsize);
                dst_len = src_len;
        } else {
                src_len = req->assoclen + req->cryptlen;
                dst_len = req->assoclen + req->cryptlen + (op_type ?
                                                        -authsize : authsize);
        }

        if (!req->cryptlen || !src_len || !dst_len)
                return 0;
        reqctx->iv_dma = dma_map_single(dev, reqctx->iv, (IV + reqctx->b0_len),
                                        DMA_BIDIRECTIONAL);
        if (dma_mapping_error(dev, reqctx->iv_dma))
                return -ENOMEM;
        if (reqctx->b0_len)
                reqctx->b0_dma = reqctx->iv_dma + IV;
        else
                reqctx->b0_dma = 0;
        if (req->src == req->dst) {
                error = dma_map_sg(dev, req->src,
                                sg_nents_for_len(req->src, src_len),
                                        DMA_BIDIRECTIONAL);
                if (!error)
                        goto err;
        } else {
                error = dma_map_sg(dev, req->src,
                                   sg_nents_for_len(req->src, src_len),
                                   DMA_TO_DEVICE);
                if (!error)
                        goto err;
                error = dma_map_sg(dev, req->dst,
                                   sg_nents_for_len(req->dst, dst_len),
                                   DMA_FROM_DEVICE);
                if (!error) {
                        dma_unmap_sg(dev, req->src,
                                     sg_nents_for_len(req->src, src_len),
                                     DMA_TO_DEVICE);
                        goto err;
                }
        }

        return 0;
err:
        dma_unmap_single(dev, reqctx->iv_dma, IV, DMA_BIDIRECTIONAL);
        return -ENOMEM;
}

void chcr_aead_dma_unmap(struct device *dev,
                         struct aead_request *req,
                         unsigned short op_type)
{
        struct chcr_aead_reqctx  *reqctx = aead_request_ctx(req);
        struct crypto_aead *tfm = crypto_aead_reqtfm(req);
        unsigned int authsize = crypto_aead_authsize(tfm);
        int src_len, dst_len;

        /* calculate and handle src and dst sg length separately
         * for inplace and out-of place operations
         */
        if (req->src == req->dst) {
                src_len = req->assoclen + req->cryptlen + (op_type ?
                                                        0 : authsize);
                dst_len = src_len;
        } else {
                src_len = req->assoclen + req->cryptlen;
                dst_len = req->assoclen + req->cryptlen + (op_type ?
                                                -authsize : authsize);
        }

        if (!req->cryptlen || !src_len || !dst_len)
                return;

        dma_unmap_single(dev, reqctx->iv_dma, (IV + reqctx->b0_len),
                                        DMA_BIDIRECTIONAL);
        if (req->src == req->dst) {
                dma_unmap_sg(dev, req->src,
                             sg_nents_for_len(req->src, src_len),
                             DMA_BIDIRECTIONAL);
        } else {
                dma_unmap_sg(dev, req->src,
                             sg_nents_for_len(req->src, src_len),
                             DMA_TO_DEVICE);
                dma_unmap_sg(dev, req->dst,
                             sg_nents_for_len(req->dst, dst_len),
                             DMA_FROM_DEVICE);
        }
}

void chcr_add_aead_src_ent(struct aead_request *req,
                           struct ulptx_sgl *ulptx)
{
        struct ulptx_walk ulp_walk;
        struct chcr_aead_reqctx  *reqctx = aead_request_ctx(req);

        if (reqctx->imm) {
                u8 *buf = (u8 *)ulptx;

                if (reqctx->b0_len) {
                        memcpy(buf, reqctx->scratch_pad, reqctx->b0_len);
                        buf += reqctx->b0_len;
                }
                sg_pcopy_to_buffer(req->src, sg_nents(req->src),
                                   buf, req->cryptlen + req->assoclen, 0);
        } else {
                ulptx_walk_init(&ulp_walk, ulptx);
                if (reqctx->b0_len)
                        ulptx_walk_add_page(&ulp_walk, reqctx->b0_len,
                                            reqctx->b0_dma);
                ulptx_walk_add_sg(&ulp_walk, req->src, req->cryptlen +
                                  req->assoclen,  0);
                ulptx_walk_end(&ulp_walk);
        }
}

void chcr_add_aead_dst_ent(struct aead_request *req,
                           struct cpl_rx_phys_dsgl *phys_cpl,
                           unsigned short qid)
{
        struct chcr_aead_reqctx  *reqctx = aead_request_ctx(req);
        struct crypto_aead *tfm = crypto_aead_reqtfm(req);
        struct dsgl_walk dsgl_walk;
        unsigned int authsize = crypto_aead_authsize(tfm);
        struct chcr_context *ctx = a_ctx(tfm);
        u32 temp;
        unsigned int rx_channel_id = reqctx->rxqidx / ctx->rxq_perchan;

        dsgl_walk_init(&dsgl_walk, phys_cpl);
        dsgl_walk_add_page(&dsgl_walk, IV + reqctx->b0_len, reqctx->iv_dma);
        temp = req->assoclen + req->cryptlen +
                (reqctx->op ? -authsize : authsize);
        dsgl_walk_add_sg(&dsgl_walk, req->dst, temp, 0);
        dsgl_walk_end(&dsgl_walk, qid, rx_channel_id);
}

void chcr_add_cipher_src_ent(struct skcipher_request *req,
                             void *ulptx,
                             struct  cipher_wr_param *wrparam)
{
        struct ulptx_walk ulp_walk;
        struct chcr_skcipher_req_ctx *reqctx = skcipher_request_ctx(req);
        u8 *buf = ulptx;

        memcpy(buf, reqctx->iv, IV);
        buf += IV;
        if (reqctx->imm) {
                sg_pcopy_to_buffer(req->src, sg_nents(req->src),
                                   buf, wrparam->bytes, reqctx->processed);
        } else {
                ulptx_walk_init(&ulp_walk, (struct ulptx_sgl *)buf);
                ulptx_walk_add_sg(&ulp_walk, reqctx->srcsg, wrparam->bytes,
                                  reqctx->src_ofst);
                reqctx->srcsg = ulp_walk.last_sg;
                reqctx->src_ofst = ulp_walk.last_sg_len;
                ulptx_walk_end(&ulp_walk);
        }
}

void chcr_add_cipher_dst_ent(struct skcipher_request *req,
                             struct cpl_rx_phys_dsgl *phys_cpl,
                             struct  cipher_wr_param *wrparam,
                             unsigned short qid)
{
        struct chcr_skcipher_req_ctx *reqctx = skcipher_request_ctx(req);
        struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(wrparam->req);
        struct chcr_context *ctx = c_ctx(tfm);
        struct dsgl_walk dsgl_walk;
        unsigned int rx_channel_id = reqctx->rxqidx / ctx->rxq_perchan;

        dsgl_walk_init(&dsgl_walk, phys_cpl);
        dsgl_walk_add_sg(&dsgl_walk, reqctx->dstsg, wrparam->bytes,
                         reqctx->dst_ofst);
        reqctx->dstsg = dsgl_walk.last_sg;
        reqctx->dst_ofst = dsgl_walk.last_sg_len;
        dsgl_walk_end(&dsgl_walk, qid, rx_channel_id);
}

void chcr_add_hash_src_ent(struct ahash_request *req,
                           struct ulptx_sgl *ulptx,
                           struct hash_wr_param *param)
{
        struct ulptx_walk ulp_walk;
        struct chcr_ahash_req_ctx *reqctx = ahash_request_ctx(req);

        if (reqctx->hctx_wr.imm) {
                u8 *buf = (u8 *)ulptx;

                if (param->bfr_len) {
                        memcpy(buf, reqctx->reqbfr, param->bfr_len);
                        buf += param->bfr_len;
                }

                sg_pcopy_to_buffer(reqctx->hctx_wr.srcsg,
                                   sg_nents(reqctx->hctx_wr.srcsg), buf,
                                   param->sg_len, 0);
        } else {
                ulptx_walk_init(&ulp_walk, ulptx);
                if (param->bfr_len)
                        ulptx_walk_add_page(&ulp_walk, param->bfr_len,
                                            reqctx->hctx_wr.dma_addr);
                ulptx_walk_add_sg(&ulp_walk, reqctx->hctx_wr.srcsg,
                                  param->sg_len, reqctx->hctx_wr.src_ofst);
                reqctx->hctx_wr.srcsg = ulp_walk.last_sg;
                reqctx->hctx_wr.src_ofst = ulp_walk.last_sg_len;
                ulptx_walk_end(&ulp_walk);
        }
}

int chcr_hash_dma_map(struct device *dev,
                      struct ahash_request *req)
{
        struct chcr_ahash_req_ctx *req_ctx = ahash_request_ctx(req);
        int error = 0;

        if (!req->nbytes)
                return 0;
        error = dma_map_sg(dev, req->src, sg_nents(req->src),
                           DMA_TO_DEVICE);
        if (!error)
                return -ENOMEM;
        req_ctx->hctx_wr.is_sg_map = 1;
        return 0;
}

void chcr_hash_dma_unmap(struct device *dev,
                         struct ahash_request *req)
{
        struct chcr_ahash_req_ctx *req_ctx = ahash_request_ctx(req);

        if (!req->nbytes)
                return;

        dma_unmap_sg(dev, req->src, sg_nents(req->src),
                           DMA_TO_DEVICE);
        req_ctx->hctx_wr.is_sg_map = 0;

}

int chcr_cipher_dma_map(struct device *dev,
                        struct skcipher_request *req)
{
        int error;

        if (req->src == req->dst) {
                error = dma_map_sg(dev, req->src, sg_nents(req->src),
                                   DMA_BIDIRECTIONAL);
                if (!error)
                        goto err;
        } else {
                error = dma_map_sg(dev, req->src, sg_nents(req->src),
                                   DMA_TO_DEVICE);
                if (!error)
                        goto err;
                error = dma_map_sg(dev, req->dst, sg_nents(req->dst),
                                   DMA_FROM_DEVICE);
                if (!error) {
                        dma_unmap_sg(dev, req->src, sg_nents(req->src),
                                   DMA_TO_DEVICE);
                        goto err;
                }
        }

        return 0;
err:
        return -ENOMEM;
}

void chcr_cipher_dma_unmap(struct device *dev,
                           struct skcipher_request *req)
{
        if (req->src == req->dst) {
                dma_unmap_sg(dev, req->src, sg_nents(req->src),
                                   DMA_BIDIRECTIONAL);
        } else {
                dma_unmap_sg(dev, req->src, sg_nents(req->src),
                                   DMA_TO_DEVICE);
                dma_unmap_sg(dev, req->dst, sg_nents(req->dst),
                                   DMA_FROM_DEVICE);
        }
}

static int set_msg_len(u8 *block, unsigned int msglen, int csize)
{
        __be32 data;

        memset(block, 0, csize);
        block += csize;

        if (csize >= 4)
                csize = 4;
        else if (msglen > (unsigned int)(1 << (8 * csize)))
                return -EOVERFLOW;

        data = cpu_to_be32(msglen);
        memcpy(block - csize, (u8 *)&data + 4 - csize, csize);

        return 0;
}

static int generate_b0(struct aead_request *req, u8 *ivptr,
                        unsigned short op_type)
{
        unsigned int l, lp, m;
        int rc;
        struct crypto_aead *aead = crypto_aead_reqtfm(req);
        struct chcr_aead_reqctx *reqctx = aead_request_ctx(req);
        u8 *b0 = reqctx->scratch_pad;

        m = crypto_aead_authsize(aead);

        memcpy(b0, ivptr, 16);

        lp = b0[0];
        l = lp + 1;

        /* set m, bits 3-5 */
        *b0 |= (8 * ((m - 2) / 2));

        /* set adata, bit 6, if associated data is used */
        if (req->assoclen)
                *b0 |= 64;
        rc = set_msg_len(b0 + 16 - l,
                         (op_type == CHCR_DECRYPT_OP) ?
                         req->cryptlen - m : req->cryptlen, l);

        return rc;
}

static inline int crypto_ccm_check_iv(const u8 *iv)
{
        /* 2 <= L <= 8, so 1 <= L' <= 7. */
        if (iv[0] < 1 || iv[0] > 7)
                return -EINVAL;

        return 0;
}

static int ccm_format_packet(struct aead_request *req,
                             u8 *ivptr,
                             unsigned int sub_type,
                             unsigned short op_type,
                             unsigned int assoclen)
{
        struct chcr_aead_reqctx *reqctx = aead_request_ctx(req);
        struct crypto_aead *tfm = crypto_aead_reqtfm(req);
        struct chcr_aead_ctx *aeadctx = AEAD_CTX(a_ctx(tfm));
        int rc = 0;

        if (sub_type == CRYPTO_ALG_SUB_TYPE_AEAD_RFC4309) {
                ivptr[0] = 3;
                memcpy(ivptr + 1, &aeadctx->salt[0], 3);
                memcpy(ivptr + 4, req->iv, 8);
                memset(ivptr + 12, 0, 4);
        } else {
                memcpy(ivptr, req->iv, 16);
        }
        if (assoclen)
                put_unaligned_be16(assoclen, &reqctx->scratch_pad[16]);

        rc = generate_b0(req, ivptr, op_type);
        /* zero the ctr value */
        memset(ivptr + 15 - ivptr[0], 0, ivptr[0] + 1);
        return rc;
}

static void fill_sec_cpl_for_aead(struct cpl_tx_sec_pdu *sec_cpl,
                                  unsigned int dst_size,
                                  struct aead_request *req,
                                  unsigned short op_type)
{
        struct crypto_aead *tfm = crypto_aead_reqtfm(req);
        struct chcr_context *ctx = a_ctx(tfm);
        struct chcr_aead_ctx *aeadctx = AEAD_CTX(ctx);
        struct chcr_aead_reqctx *reqctx = aead_request_ctx(req);
        unsigned int cipher_mode = CHCR_SCMD_CIPHER_MODE_AES_CCM;
        unsigned int mac_mode = CHCR_SCMD_AUTH_MODE_CBCMAC;
        unsigned int rx_channel_id = reqctx->rxqidx / ctx->rxq_perchan;
        unsigned int ccm_xtra;
        unsigned int tag_offset = 0, auth_offset = 0;
        unsigned int assoclen;

        if (get_aead_subtype(tfm) == CRYPTO_ALG_SUB_TYPE_AEAD_RFC4309)
                assoclen = req->assoclen - 8;
        else
                assoclen = req->assoclen;
        ccm_xtra = CCM_B0_SIZE +
                ((assoclen) ? CCM_AAD_FIELD_SIZE : 0);

        auth_offset = req->cryptlen ?
                (req->assoclen + IV + 1 + ccm_xtra) : 0;
        if (op_type == CHCR_DECRYPT_OP) {
                if (crypto_aead_authsize(tfm) != req->cryptlen)
                        tag_offset = crypto_aead_authsize(tfm);
                else
                        auth_offset = 0;
        }

        sec_cpl->op_ivinsrtofst = FILL_SEC_CPL_OP_IVINSR(rx_channel_id, 2, 1);
        sec_cpl->pldlen =
                htonl(req->assoclen + IV + req->cryptlen + ccm_xtra);
        /* For CCM there wil be b0 always. So AAD start will be 1 always */
        sec_cpl->aadstart_cipherstop_hi = FILL_SEC_CPL_CIPHERSTOP_HI(
                                1 + IV, IV + assoclen + ccm_xtra,
                                req->assoclen + IV + 1 + ccm_xtra, 0);

        sec_cpl->cipherstop_lo_authinsert = FILL_SEC_CPL_AUTHINSERT(0,
                                        auth_offset, tag_offset,
                                        (op_type == CHCR_ENCRYPT_OP) ? 0 :
                                        crypto_aead_authsize(tfm));
        sec_cpl->seqno_numivs =  FILL_SEC_CPL_SCMD0_SEQNO(op_type,
                                        (op_type == CHCR_ENCRYPT_OP) ? 0 : 1,
                                        cipher_mode, mac_mode,
                                        aeadctx->hmac_ctrl, IV >> 1);