drivers/net/ethernet/chelsio/libcxgb/libcxgb_cm.h

   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
  43 void
  44 cxgb_get_4tuple(struct cpl_pass_accept_req *, enum chip_type,
  45                 int *, __u8 *, __u8 *, __be16 *, __be16 *);
  46 struct dst_entry *
  47 cxgb_find_route(struct cxgb4_lld_info *,
  48                 struct net_device *(*)(struct net_device *),
  49                 __be32, __be32, __be16, __be16, u8);
  50 struct dst_entry *
  51 cxgb_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  */
  57 static 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
  64 static inline void
  65 cxgb_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
  79 static 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
  88 static inline void
  89 cxgb_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
 100 static inline void
 101 cxgb_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
 114 static inline void
 115 cxgb_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
 129 static inline void
 130 cxgb_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
 142 static inline void
 143 cxgb_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