LXR linux/drivers/net/ethernet/chelsio/cxgb4/srq.c

   1/*
   2 * This file is part of the Chelsio T6 Ethernet driver for Linux.
   3 *
   4 * Copyright (c) 2017-2018 Chelsio Communications, Inc. All rights reserved.
   5 *
   6 * This software is available to you under a choice of one of two
   7 * licenses.  You may choose to be licensed under the terms of the GNU
   8 * General Public License (GPL) Version 2, available from the file
   9 * COPYING in the main directory of this source tree, or the
  10 * OpenIB.org BSD license below:
  11 *
  12 *     Redistribution and use in source and binary forms, with or
  13 *     without modification, are permitted provided that the following
  14 *     conditions are met:
  15 *
  16 *      - Redistributions of source code must retain the above
  17 *        copyright notice, this list of conditions and the following
  18 *        disclaimer.
  19 *
  20 *      - Redistributions in binary form must reproduce the above
  21 *        copyright notice, this list of conditions and the following
  22 *        disclaimer in the documentation and/or other materials
  23 *        provided with the distribution.
  24 *
  25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  32 * SOFTWARE.
  33 */
  34
  35#include "cxgb4.h"
  36#include "t4_msg.h"
  37#include "srq.h"
  38
  39struct srq_data *t4_init_srq(int srq_size)
  40{
  41        struct srq_data *s;
  42
  43        s = kvzalloc(sizeof(*s), GFP_KERNEL);
  44        if (!s)
  45                return NULL;
  46
  47        s->srq_size = srq_size;
  48        init_completion(&s->comp);
  49        mutex_init(&s->lock);
  50
  51        return s;
  52}
  53
  54/* cxgb4_get_srq_entry: read the SRQ table entry
  55 * @dev: Pointer to the net_device
  56 * @idx: Index to the srq
  57 * @entryp: pointer to the srq entry
  58 *
  59 * Sends CPL_SRQ_TABLE_REQ message for the given index.
  60 * Contents will be returned in CPL_SRQ_TABLE_RPL message.
  61 *
  62 * Returns zero if the read is successful, else a error
  63 * number will be returned. Caller should not use the srq
  64 * entry if the return value is non-zero.
  65 *
  66 *
  67 */
  68int cxgb4_get_srq_entry(struct net_device *dev,
  69                        int srq_idx, struct srq_entry *entryp)
  70{
  71        struct cpl_srq_table_req *req;
  72        struct adapter *adap;
  73        struct sk_buff *skb;
  74        struct srq_data *s;
  75        int rc = -ENODEV;
  76
  77        adap = netdev2adap(dev);
  78        s = adap->srq;
  79
  80        if (!(adap->flags & FULL_INIT_DONE) || !s)
  81                goto out;
  82
  83        skb = alloc_skb(sizeof(*req), GFP_KERNEL);
  84        if (!skb)
  85                return -ENOMEM;
  86        req = (struct cpl_srq_table_req *)
  87                __skb_put_zero(skb, sizeof(*req));
  88        INIT_TP_WR(req, 0);
  89        OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SRQ_TABLE_REQ,
  90                                              TID_TID_V(srq_idx) |
  91                                TID_QID_V(adap->sge.fw_evtq.abs_id)));
  92        req->idx = srq_idx;
  93
  94        mutex_lock(&s->lock);
  95
  96        s->entryp = entryp;
  97        t4_mgmt_tx(adap, skb);
  98
  99        rc = wait_for_completion_timeout(&s->comp, SRQ_WAIT_TO);
 100        if (rc)
 101                rc = 0;
 102        else /* !rc means we timed out */
 103                rc = -ETIMEDOUT;
 104
 105        WARN_ON_ONCE(entryp->idx != srq_idx);
 106        mutex_unlock(&s->lock);
 107out:
 108        return rc;
 109}
 110EXPORT_SYMBOL(cxgb4_get_srq_entry);
 111
 112void do_srq_table_rpl(struct adapter *adap,
 113                      const struct cpl_srq_table_rpl *rpl)
 114{
 115        unsigned int idx = TID_TID_G(GET_TID(rpl));
 116        struct srq_data *s = adap->srq;
 117        struct srq_entry *e;
 118
 119        if (unlikely(rpl->status != CPL_CONTAINS_READ_RPL)) {
 120                dev_err(adap->pdev_dev,
 121                        "Unexpected SRQ_TABLE_RPL status %u for entry %u\n",
 122                                rpl->status, idx);
 123                goto out;
 124        }
 125
 126        /* Store the read entry */
 127        e = s->entryp;
 128        e->valid = 1;
 129        e->idx = idx;
 130        e->pdid = SRQT_PDID_G(be64_to_cpu(rpl->rsvd_pdid));
 131        e->qlen = SRQT_QLEN_G(be32_to_cpu(rpl->qlen_qbase));
 132        e->qbase = SRQT_QBASE_G(be32_to_cpu(rpl->qlen_qbase));
 133        e->cur_msn = be16_to_cpu(rpl->cur_msn);
 134        e->max_msn = be16_to_cpu(rpl->max_msn);
 135out:
 136        complete(&s->comp);
 137}
 138