1 /*-
2 * Copyright (c) 2010-2016 Solarflare Communications Inc.
3 * All rights reserved.
4 *
5 * This software was developed in part by Philip Paeps under contract for
6 * Solarflare Communications, Inc.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright notice,
12 * this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright notice,
14 * this list of conditions and the following disclaimer in the documentation
15 * and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
19 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
20 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
21 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
22 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
23 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
24 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
25 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
26 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
27 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 *
29 * The views and conclusions contained in the software and documentation are
30 * those of the authors and should not be interpreted as representing official
31 * policies, either expressed or implied, of the FreeBSD Project.
32 *
33 * $FreeBSD: releng/11.2/sys/dev/sfxge/sfxge_tx.h 331722 2018-03-29 02:50:57Z eadler $
34 */
35
36 #ifndef _SFXGE_TX_H
37 #define _SFXGE_TX_H
38
39 #include <netinet/in.h>
40 #include <netinet/ip.h>
41 #include <netinet/tcp.h>
42
43 /* If defined, parse TX packets directly in if_transmit
44 * for better cache locality and reduced time under TX lock
45 */
46 #define SFXGE_TX_PARSE_EARLY 1
47
48 /* Maximum size of TSO packet */
49 #define SFXGE_TSO_MAX_SIZE (65535)
50
51 /*
52 * Maximum number of segments to be created for a TSO packet.
53 * Allow for a reasonable minimum MSS of 512.
54 */
55 #define SFXGE_TSO_MAX_SEGS howmany(SFXGE_TSO_MAX_SIZE, 512)
56
57 /* Maximum number of DMA segments needed to map an mbuf chain. With
58 * TSO, the mbuf length may be just over 64K, divided into 2K mbuf
59 * clusters taking into account that the first may be not 2K cluster
60 * boundary aligned.
61 * Packet header may be split into two segments because of, for example,
62 * VLAN header insertion.
63 * The chain could be longer than this initially, but can be shortened
64 * with m_collapse().
65 */
66 #define SFXGE_TX_MAPPING_MAX_SEG \
67 (2 + howmany(SFXGE_TSO_MAX_SIZE, MCLBYTES) + 1)
68
69 /*
70 * Buffer mapping flags.
71 *
72 * Buffers and DMA mappings must be freed when the last descriptor
73 * referring to them is completed. Set the TX_BUF_UNMAP and
74 * TX_BUF_MBUF flags on the last descriptor generated for an mbuf
75 * chain. Set only the TX_BUF_UNMAP flag on a descriptor referring to
76 * a heap buffer.
77 */
78 enum sfxge_tx_buf_flags {
79 TX_BUF_UNMAP = 1,
80 TX_BUF_MBUF = 2,
81 };
82
83 /*
84 * Buffer mapping information for descriptors in flight.
85 */
86 struct sfxge_tx_mapping {
87 union {
88 struct mbuf *mbuf;
89 caddr_t heap_buf;
90 } u;
91 bus_dmamap_t map;
92 enum sfxge_tx_buf_flags flags;
93 };
94
95 #define SFXGE_TX_DPL_GET_PKT_LIMIT_DEFAULT (64 * 1024)
96 #define SFXGE_TX_DPL_GET_NON_TCP_PKT_LIMIT_DEFAULT 1024
97 #define SFXGE_TX_DPL_PUT_PKT_LIMIT_DEFAULT 1024
98
99 /*
100 * Deferred packet list.
101 */
102 struct sfxge_tx_dpl {
103 unsigned int std_get_max; /* Maximum number of packets
104 * in get list */
105 unsigned int std_get_non_tcp_max; /* Maximum number
106 * of non-TCP packets
107 * in get list */
108 unsigned int std_put_max; /* Maximum number of packets
109 * in put list */
110 uintptr_t std_put; /* Head of put list. */
111 struct mbuf *std_get; /* Head of get list. */
112 struct mbuf **std_getp; /* Tail of get list. */
113 unsigned int std_get_count; /* Packets in get list. */
114 unsigned int std_get_non_tcp_count; /* Non-TCP packets
115 * in get list */
116 unsigned int std_get_hiwat; /* Packets in get list
117 * high watermark */
118 unsigned int std_put_hiwat; /* Packets in put list
119 * high watermark */
120 };
121
122
123 #define SFXGE_TX_BUFFER_SIZE 0x400
124 #define SFXGE_TX_HEADER_SIZE 0x100
125 #define SFXGE_TX_COPY_THRESHOLD 0x200
126
127 enum sfxge_txq_state {
128 SFXGE_TXQ_UNINITIALIZED = 0,
129 SFXGE_TXQ_INITIALIZED,
130 SFXGE_TXQ_STARTED
131 };
132
133 enum sfxge_txq_type {
134 SFXGE_TXQ_NON_CKSUM = 0,
135 SFXGE_TXQ_IP_CKSUM,
136 SFXGE_TXQ_IP_TCP_UDP_CKSUM,
137 SFXGE_TXQ_NTYPES
138 };
139
140 #define SFXGE_TXQ_UNBLOCK_LEVEL(_entries) (EFX_TXQ_LIMIT(_entries) / 4)
141
142 #define SFXGE_TX_BATCH 64
143
144 #define SFXGE_TXQ_LOCK_INIT(_txq, _ifname, _txq_index) \
145 do { \
146 struct sfxge_txq *__txq = (_txq); \
147 \
148 snprintf((__txq)->lock_name, \
149 sizeof((__txq)->lock_name), \
150 "%s:txq%u", (_ifname), (_txq_index)); \
151 mtx_init(&(__txq)->lock, (__txq)->lock_name, \
152 NULL, MTX_DEF); \
153 } while (B_FALSE)
154 #define SFXGE_TXQ_LOCK_DESTROY(_txq) \
155 mtx_destroy(&(_txq)->lock)
156 #define SFXGE_TXQ_LOCK(_txq) \
157 mtx_lock(&(_txq)->lock)
158 #define SFXGE_TXQ_TRYLOCK(_txq) \
159 mtx_trylock(&(_txq)->lock)
160 #define SFXGE_TXQ_UNLOCK(_txq) \
161 mtx_unlock(&(_txq)->lock)
162 #define SFXGE_TXQ_LOCK_ASSERT_OWNED(_txq) \
163 mtx_assert(&(_txq)->lock, MA_OWNED)
164 #define SFXGE_TXQ_LOCK_ASSERT_NOTOWNED(_txq) \
165 mtx_assert(&(_txq)->lock, MA_NOTOWNED)
166
167
168 struct sfxge_txq {
169 /* The following fields should be written very rarely */
170 struct sfxge_softc *sc;
171 enum sfxge_txq_state init_state;
172 enum sfxge_flush_state flush_state;
173 unsigned int tso_fw_assisted;
174 enum sfxge_txq_type type;
175 unsigned int txq_index;
176 unsigned int evq_index;
177 efsys_mem_t mem;
178 unsigned int buf_base_id;
179 unsigned int entries;
180 unsigned int ptr_mask;
181 unsigned int max_pkt_desc;
182
183 struct sfxge_tx_mapping *stmp; /* Packets in flight. */
184 bus_dma_tag_t packet_dma_tag;
185 efx_desc_t *pend_desc;
186 efx_txq_t *common;
187
188 efsys_mem_t *tsoh_buffer;
189
190 char lock_name[SFXGE_LOCK_NAME_MAX];
191
192 /* This field changes more often and is read regularly on both
193 * the initiation and completion paths
194 */
195 int blocked __aligned(CACHE_LINE_SIZE);
196
197 /* The following fields change more often, and are used mostly
198 * on the initiation path
199 */
200 struct mtx lock __aligned(CACHE_LINE_SIZE);
201 struct sfxge_tx_dpl dpl; /* Deferred packet list. */
202 unsigned int n_pend_desc;
203 unsigned int added;
204 unsigned int reaped;
205
206 /* The last VLAN TCI seen on the queue if FW-assisted tagging is
207 used */
208 uint16_t hw_vlan_tci;
209
210 /* Statistics */
211 unsigned long tso_bursts;
212 unsigned long tso_packets;
213 unsigned long tso_long_headers;
214 unsigned long collapses;
215 unsigned long drops;
216 unsigned long get_overflow;
217 unsigned long get_non_tcp_overflow;
218 unsigned long put_overflow;
219 unsigned long netdown_drops;
220 unsigned long tso_pdrop_too_many;
221 unsigned long tso_pdrop_no_rsrc;
222
223 /* The following fields change more often, and are used mostly
224 * on the completion path
225 */
226 unsigned int pending __aligned(CACHE_LINE_SIZE);
227 unsigned int completed;
228 struct sfxge_txq *next;
229 };
230
231 struct sfxge_evq;
232
233 extern uint64_t sfxge_tx_get_drops(struct sfxge_softc *sc);
234
235 extern int sfxge_tx_init(struct sfxge_softc *sc);
236 extern void sfxge_tx_fini(struct sfxge_softc *sc);
237 extern int sfxge_tx_start(struct sfxge_softc *sc);
238 extern void sfxge_tx_stop(struct sfxge_softc *sc);
239 extern void sfxge_tx_qcomplete(struct sfxge_txq *txq, struct sfxge_evq *evq);
240 extern void sfxge_tx_qflush_done(struct sfxge_txq *txq);
241 extern void sfxge_if_qflush(struct ifnet *ifp);
242 extern int sfxge_if_transmit(struct ifnet *ifp, struct mbuf *m);
243
244 #endif
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