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