2 * Copyright (c) 2010-2015 Solarflare Communications Inc.
5 * This software was developed in part by Philip Paeps under contract for
6 * Solarflare Communications, Inc.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are met:
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.
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.
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.
39 #include <netinet/in.h>
40 #include <netinet/ip.h>
41 #include <netinet/tcp.h>
43 /* Maximum size of TSO packet */
44 #define SFXGE_TSO_MAX_SIZE (65535)
47 * Maximum number of segments to be created for a TSO packet.
48 * Allow for a reasonable minimum MSS of 512.
50 #define SFXGE_TSO_MAX_SEGS howmany(SFXGE_TSO_MAX_SIZE, 512)
52 /* Maximum number of DMA segments needed to map an mbuf chain. With
53 * TSO, the mbuf length may be just over 64K, divided into 2K mbuf
54 * clusters. (The chain could be longer than this initially, but can
55 * be shortened with m_collapse().)
57 #define SFXGE_TX_MAPPING_MAX_SEG \
58 (1 + howmany(SFXGE_TSO_MAX_SIZE, MCLBYTES))
61 * Buffer mapping flags.
63 * Buffers and DMA mappings must be freed when the last descriptor
64 * referring to them is completed. Set the TX_BUF_UNMAP and
65 * TX_BUF_MBUF flags on the last descriptor generated for an mbuf
66 * chain. Set only the TX_BUF_UNMAP flag on a descriptor referring to
69 enum sfxge_tx_buf_flags {
75 * Buffer mapping information for descriptors in flight.
77 struct sfxge_tx_mapping {
83 enum sfxge_tx_buf_flags flags;
86 #define SFXGE_TX_DPL_GET_PKT_LIMIT_DEFAULT (64 * 1024)
87 #define SFXGE_TX_DPL_GET_NON_TCP_PKT_LIMIT_DEFAULT 1024
88 #define SFXGE_TX_DPL_PUT_PKT_LIMIT_DEFAULT 1024
91 * Deferred packet list.
94 unsigned int std_get_max; /* Maximum number of packets
96 unsigned int std_get_non_tcp_max; /* Maximum number
99 unsigned int std_put_max; /* Maximum number of packets
101 uintptr_t std_put; /* Head of put list. */
102 struct mbuf *std_get; /* Head of get list. */
103 struct mbuf **std_getp; /* Tail of get list. */
104 unsigned int std_get_count; /* Packets in get list. */
105 unsigned int std_get_non_tcp_count; /* Non-TCP packets
107 unsigned int std_get_hiwat; /* Packets in get list
109 unsigned int std_put_hiwat; /* Packets in put list
114 #define SFXGE_TX_BUFFER_SIZE 0x400
115 #define SFXGE_TX_HEADER_SIZE 0x100
116 #define SFXGE_TX_COPY_THRESHOLD 0x200
118 enum sfxge_txq_state {
119 SFXGE_TXQ_UNINITIALIZED = 0,
120 SFXGE_TXQ_INITIALIZED,
124 enum sfxge_txq_type {
125 SFXGE_TXQ_NON_CKSUM = 0,
127 SFXGE_TXQ_IP_TCP_UDP_CKSUM,
131 #define SFXGE_TXQ_UNBLOCK_LEVEL(_entries) (EFX_TXQ_LIMIT(_entries) / 4)
133 #define SFXGE_TX_BATCH 64
135 #define SFXGE_TXQ_LOCK_INIT(_txq, _ifname, _txq_index) \
137 struct sfxge_txq *__txq = (_txq); \
139 snprintf((__txq)->lock_name, \
140 sizeof((__txq)->lock_name), \
141 "%s:txq%u", (_ifname), (_txq_index)); \
142 mtx_init(&(__txq)->lock, (__txq)->lock_name, \
145 #define SFXGE_TXQ_LOCK_DESTROY(_txq) \
146 mtx_destroy(&(_txq)->lock)
147 #define SFXGE_TXQ_LOCK(_txq) \
148 mtx_lock(&(_txq)->lock)
149 #define SFXGE_TXQ_TRYLOCK(_txq) \
150 mtx_trylock(&(_txq)->lock)
151 #define SFXGE_TXQ_UNLOCK(_txq) \
152 mtx_unlock(&(_txq)->lock)
153 #define SFXGE_TXQ_LOCK_ASSERT_OWNED(_txq) \
154 mtx_assert(&(_txq)->lock, MA_OWNED)
155 #define SFXGE_TXQ_LOCK_ASSERT_NOTOWNED(_txq) \
156 mtx_assert(&(_txq)->lock, MA_NOTOWNED)
160 /* The following fields should be written very rarely */
161 struct sfxge_softc *sc;
162 enum sfxge_txq_state init_state;
163 enum sfxge_flush_state flush_state;
164 enum sfxge_txq_type type;
165 unsigned int txq_index;
166 unsigned int evq_index;
168 unsigned int buf_base_id;
169 unsigned int entries;
170 unsigned int ptr_mask;
171 unsigned int max_pkt_desc;
173 struct sfxge_tx_mapping *stmp; /* Packets in flight. */
174 bus_dma_tag_t packet_dma_tag;
175 efx_desc_t *pend_desc;
178 efsys_mem_t *tsoh_buffer;
180 char lock_name[SFXGE_LOCK_NAME_MAX];
182 /* This field changes more often and is read regularly on both
183 * the initiation and completion paths
185 int blocked __aligned(CACHE_LINE_SIZE);
187 /* The following fields change more often, and are used mostly
188 * on the initiation path
190 struct mtx lock __aligned(CACHE_LINE_SIZE);
191 struct sfxge_tx_dpl dpl; /* Deferred packet list. */
192 unsigned int n_pend_desc;
196 /* The last VLAN TCI seen on the queue if FW-assisted tagging is
198 uint16_t hw_vlan_tci;
201 unsigned long tso_bursts;
202 unsigned long tso_packets;
203 unsigned long tso_long_headers;
204 unsigned long collapses;
206 unsigned long get_overflow;
207 unsigned long get_non_tcp_overflow;
208 unsigned long put_overflow;
209 unsigned long netdown_drops;
210 unsigned long tso_pdrop_too_many;
211 unsigned long tso_pdrop_no_rsrc;
213 /* The following fields change more often, and are used mostly
214 * on the completion path
216 unsigned int pending __aligned(CACHE_LINE_SIZE);
217 unsigned int completed;
218 struct sfxge_txq *next;
224 extern int sfxge_tx_init(struct sfxge_softc *sc);
225 extern void sfxge_tx_fini(struct sfxge_softc *sc);
226 extern int sfxge_tx_start(struct sfxge_softc *sc);
227 extern void sfxge_tx_stop(struct sfxge_softc *sc);
228 extern void sfxge_tx_qcomplete(struct sfxge_txq *txq, struct sfxge_evq *evq);
229 extern void sfxge_tx_qflush_done(struct sfxge_txq *txq);
230 extern void sfxge_if_qflush(struct ifnet *ifp);
231 extern int sfxge_if_transmit(struct ifnet *ifp, struct mbuf *m);