LXR linux/drivers/net/ethernet/chelsio/libcxgb/libcxgb

   1/*
   2 * Copyright (c) 2016 Chelsio Communications, Inc. All rights reserved.
   3 *
   4 * This software is available to you under a choice of one of two
   5 * licenses.  You may choose to be licensed under the terms of the GNU
   6 * General Public License (GPL) Version 2, available from the file
   7 * COPYING in the main directory of this source tree, or the
   8 * OpenIB.org BSD license below:
   9 *
  10 *     Redistribution and use in source and binary forms, with or
  11 *     without modification, are permitted provided that the following
  12 *     conditions are met:
  13 *
  14 *      - Redistributions of source code must retain the above
  15 *        copyright notice, this list of conditions and the following
  16 *        disclaimer.
  17 *
  18 *      - Redistributions in binary form must reproduce the above
  19 *        copyright notice, this list of conditions and the following
  20 *        disclaimer in the documentation and/or other materials
  21 *        provided with the distribution.
  22 *
  23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30 * SOFTWARE.
  31 */
  32
  33#ifndef __LIBCXGB_CM_H__
  34#define __LIBCXGB_CM_H__
  35
  36
  37#include <net/tcp.h>
  38
  39#include <cxgb4.h>
  40#include <t4_msg.h>
  41#include <l2t.h>
  42
  43void
  44cxgb_get_4tuple(struct cpl_pass_accept_req *, enum chip_type,
  45                int *, __u8 *, __u8 *, __be16 *, __be16 *);
  46struct dst_entry *
  47cxgb_find_route(struct cxgb4_lld_info *,
  48                struct net_device *(*)(struct net_device *),
  49                __be32, __be32, __be16, __be16, u8);
  50struct dst_entry *
  51cxgb_find_route6(struct cxgb4_lld_info *,
  52                 struct net_device *(*)(struct net_device *),
  53                 __u8 *, __u8 *, __be16, __be16, u8, __u32);
  54
  55/* Returns whether a CPL status conveys negative advice.
  56 */
  57static inline bool cxgb_is_neg_adv(unsigned int status)
  58{
  59        return status == CPL_ERR_RTX_NEG_ADVICE ||
  60               status == CPL_ERR_PERSIST_NEG_ADVICE ||
  61               status == CPL_ERR_KEEPALV_NEG_ADVICE;
  62}
  63
  64static inline void
  65cxgb_best_mtu(const unsigned short *mtus, unsigned short mtu,
  66              unsigned int *idx, int use_ts, int ipv6)
  67{
  68        unsigned short hdr_size = (ipv6 ?
  69                                   sizeof(struct ipv6hdr) :
  70                                   sizeof(struct iphdr)) +
  71                                  sizeof(struct tcphdr) +
  72                                  (use_ts ?
  73                                   round_up(TCPOLEN_TIMESTAMP, 4) : 0);
  74        unsigned short data_size = mtu - hdr_size;
  75
  76        cxgb4_best_aligned_mtu(mtus, hdr_size, data_size, 8, idx);
  77}
  78
  79static inline u32 cxgb_compute_wscale(u32 win)
  80{
  81        u32 wscale = 0;
  82
  83        while (wscale < 14 && (65535 << wscale) < win)
  84                wscale++;
  85        return wscale;
  86}
  87
  88static inline void
  89cxgb_mk_tid_release(struct sk_buff *skb, u32 len, u32 tid, u16 chan)
  90{
  91        struct cpl_tid_release *req;
  92
  93        req = __skb_put_zero(skb, len);
  94
  95        INIT_TP_WR(req, tid);
  96        OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_TID_RELEASE, tid));
  97        set_wr_txq(skb, CPL_PRIORITY_SETUP, chan);
  98}
  99
 100static inline void
 101cxgb_mk_close_con_req(struct sk_buff *skb, u32 len, u32 tid, u16 chan,
 102                      void *handle, arp_err_handler_t handler)
 103{
 104        struct cpl_close_con_req *req;
 105
 106        req = __skb_put_zero(skb, len);
 107
 108        INIT_TP_WR(req, tid);
 109        OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_CLOSE_CON_REQ, tid));
 110        set_wr_txq(skb, CPL_PRIORITY_DATA, chan);
 111        t4_set_arp_err_handler(skb, handle, handler);
 112}
 113
 114static inline void
 115cxgb_mk_abort_req(struct sk_buff *skb, u32 len, u32 tid, u16 chan,
 116                  void *handle, arp_err_handler_t handler)
 117{
 118        struct cpl_abort_req *req;
 119
 120        req = __skb_put_zero(skb, len);
 121
 122        INIT_TP_WR(req, tid);
 123        OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_ABORT_REQ, tid));
 124        req->cmd = CPL_ABORT_SEND_RST;
 125        set_wr_txq(skb, CPL_PRIORITY_DATA, chan);
 126        t4_set_arp_err_handler(skb, handle, handler);
 127}
 128
 129static inline void
 130cxgb_mk_abort_rpl(struct sk_buff *skb, u32 len, u32 tid, u16 chan)
 131{
 132        struct cpl_abort_rpl *rpl;
 133
 134        rpl = __skb_put_zero(skb, len);
 135
 136        INIT_TP_WR(rpl, tid);
 137        OPCODE_TID(rpl) = cpu_to_be32(MK_OPCODE_TID(CPL_ABORT_RPL, tid));
 138        rpl->cmd = CPL_ABORT_NO_RST;
 139        set_wr_txq(skb, CPL_PRIORITY_DATA, chan);
 140}
 141
 142static inline void
 143cxgb_mk_rx_data_ack(struct sk_buff *skb, u32 len, u32 tid, u16 chan,
 144                    u32 credit_dack)
 145{
 146        struct cpl_rx_data_ack *req;
 147
 148        req = __skb_put_zero(skb, len);
 149
 150        INIT_TP_WR(req, tid);
 151        OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_RX_DATA_ACK, tid));
 152        req->credit_dack = cpu_to_be32(credit_dack);
 153        set_wr_txq(skb, CPL_PRIORITY_ACK, chan);
 154}
 155#endif
 156