2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2010-2016 Solarflare Communications Inc.
7 * This software was developed in part by Philip Paeps under contract for
8 * Solarflare Communications, Inc.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions are met:
13 * 1. Redistributions of source code must retain the above copyright notice,
14 * this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright notice,
16 * this list of conditions and the following disclaimer in the documentation
17 * and/or other materials provided with the distribution.
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
20 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
21 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
23 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
24 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
26 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
27 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
28 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
29 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 * The views and conclusions contained in the software and documentation are
32 * those of the authors and should not be interpreted as representing official
33 * policies, either expressed or implied, of the FreeBSD Project.
41 #include <netinet/in.h>
42 #include <netinet/ip.h>
43 #include <netinet/tcp.h>
45 /* If defined, parse TX packets directly in if_transmit
46 * for better cache locality and reduced time under TX lock
48 #define SFXGE_TX_PARSE_EARLY 1
50 /* Maximum size of TSO packet */
51 #define SFXGE_TSO_MAX_SIZE (65535)
54 * Maximum number of segments to be created for a TSO packet.
55 * Allow for a reasonable minimum MSS of 512.
57 #define SFXGE_TSO_MAX_SEGS howmany(SFXGE_TSO_MAX_SIZE, 512)
59 /* Maximum number of DMA segments needed to map an mbuf chain. With
60 * TSO, the mbuf length may be just over 64K, divided into 2K mbuf
61 * clusters taking into account that the first may be not 2K cluster
63 * Packet header may be split into two segments because of, for example,
64 * VLAN header insertion.
65 * The chain could be longer than this initially, but can be shortened
68 #define SFXGE_TX_MAPPING_MAX_SEG \
69 (2 + howmany(SFXGE_TSO_MAX_SIZE, MCLBYTES) + 1)
72 * Buffer mapping flags.
74 * Buffers and DMA mappings must be freed when the last descriptor
75 * referring to them is completed. Set the TX_BUF_UNMAP and
76 * TX_BUF_MBUF flags on the last descriptor generated for an mbuf
77 * chain. Set only the TX_BUF_UNMAP flag on a descriptor referring to
80 enum sfxge_tx_buf_flags {
86 * Buffer mapping information for descriptors in flight.
88 struct sfxge_tx_mapping {
94 enum sfxge_tx_buf_flags flags;
97 #define SFXGE_TX_DPL_GET_PKT_LIMIT_DEFAULT (64 * 1024)
98 #define SFXGE_TX_DPL_GET_NON_TCP_PKT_LIMIT_DEFAULT 1024
99 #define SFXGE_TX_DPL_PUT_PKT_LIMIT_DEFAULT 1024
102 * Deferred packet list.
104 struct sfxge_tx_dpl {
105 unsigned int std_get_max; /* Maximum number of packets
107 unsigned int std_get_non_tcp_max; /* Maximum number
110 unsigned int std_put_max; /* Maximum number of packets
112 uintptr_t std_put; /* Head of put list. */
113 struct mbuf *std_get; /* Head of get list. */
114 struct mbuf **std_getp; /* Tail of get list. */
115 unsigned int std_get_count; /* Packets in get list. */
116 unsigned int std_get_non_tcp_count; /* Non-TCP packets
118 unsigned int std_get_hiwat; /* Packets in get list
120 unsigned int std_put_hiwat; /* Packets in put list
125 #define SFXGE_TX_BUFFER_SIZE 0x400
126 #define SFXGE_TX_HEADER_SIZE 0x100
127 #define SFXGE_TX_COPY_THRESHOLD 0x200
129 enum sfxge_txq_state {
130 SFXGE_TXQ_UNINITIALIZED = 0,
131 SFXGE_TXQ_INITIALIZED,
135 enum sfxge_txq_type {
136 SFXGE_TXQ_NON_CKSUM = 0,
138 SFXGE_TXQ_IP_TCP_UDP_CKSUM,
142 #define SFXGE_TXQ_UNBLOCK_LEVEL(_entries) (EFX_TXQ_LIMIT(_entries) / 4)
144 #define SFXGE_TX_BATCH 64
146 #define SFXGE_TXQ_LOCK_INIT(_txq, _ifname, _txq_index) \
148 struct sfxge_txq *__txq = (_txq); \
150 snprintf((__txq)->lock_name, \
151 sizeof((__txq)->lock_name), \
152 "%s:txq%u", (_ifname), (_txq_index)); \
153 mtx_init(&(__txq)->lock, (__txq)->lock_name, \
156 #define SFXGE_TXQ_LOCK_DESTROY(_txq) \
157 mtx_destroy(&(_txq)->lock)
158 #define SFXGE_TXQ_LOCK(_txq) \
159 mtx_lock(&(_txq)->lock)
160 #define SFXGE_TXQ_TRYLOCK(_txq) \
161 mtx_trylock(&(_txq)->lock)
162 #define SFXGE_TXQ_UNLOCK(_txq) \
163 mtx_unlock(&(_txq)->lock)
164 #define SFXGE_TXQ_LOCK_ASSERT_OWNED(_txq) \
165 mtx_assert(&(_txq)->lock, MA_OWNED)
166 #define SFXGE_TXQ_LOCK_ASSERT_NOTOWNED(_txq) \
167 mtx_assert(&(_txq)->lock, MA_NOTOWNED)
171 /* The following fields should be written very rarely */
172 struct sfxge_softc *sc;
173 enum sfxge_txq_state init_state;
174 enum sfxge_flush_state flush_state;
175 unsigned int tso_fw_assisted;
176 enum sfxge_txq_type type;
177 unsigned int evq_index;
179 unsigned int buf_base_id;
180 unsigned int entries;
181 unsigned int ptr_mask;
182 unsigned int max_pkt_desc;
184 struct sfxge_tx_mapping *stmp; /* Packets in flight. */
185 bus_dma_tag_t packet_dma_tag;
186 efx_desc_t *pend_desc;
189 efsys_mem_t *tsoh_buffer;
191 char lock_name[SFXGE_LOCK_NAME_MAX];
193 /* This field changes more often and is read regularly on both
194 * the initiation and completion paths
196 int blocked __aligned(CACHE_LINE_SIZE);
198 /* The following fields change more often, and are used mostly
199 * on the initiation path
201 struct mtx lock __aligned(CACHE_LINE_SIZE);
202 struct sfxge_tx_dpl dpl; /* Deferred packet list. */
203 unsigned int n_pend_desc;
207 /* The last VLAN TCI seen on the queue if FW-assisted tagging is
209 uint16_t hw_vlan_tci;
212 unsigned long tso_bursts;
213 unsigned long tso_packets;
214 unsigned long tso_long_headers;
215 unsigned long collapses;
217 unsigned long get_overflow;
218 unsigned long get_non_tcp_overflow;
219 unsigned long put_overflow;
220 unsigned long netdown_drops;
221 unsigned long tso_pdrop_too_many;
222 unsigned long tso_pdrop_no_rsrc;
224 /* The following fields change more often, and are used mostly
225 * on the completion path
227 unsigned int pending __aligned(CACHE_LINE_SIZE);
228 unsigned int completed;
229 struct sfxge_txq *next;
234 extern uint64_t sfxge_tx_get_drops(struct sfxge_softc *sc);
236 extern int sfxge_tx_init(struct sfxge_softc *sc);
237 extern void sfxge_tx_fini(struct sfxge_softc *sc);
238 extern int sfxge_tx_start(struct sfxge_softc *sc);
239 extern void sfxge_tx_stop(struct sfxge_softc *sc);
240 extern void sfxge_tx_qcomplete(struct sfxge_txq *txq, struct sfxge_evq *evq);
241 extern void sfxge_tx_qflush_done(struct sfxge_txq *txq);
242 extern void sfxge_if_qflush(struct ifnet *ifp);
243 extern int sfxge_if_transmit(struct ifnet *ifp, struct mbuf *m);