1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2010-2016 Solarflare Communications Inc.
5 * All rights reserved.
6 *
7 * This software was developed in part by Philip Paeps under contract for
8 * Solarflare Communications, Inc.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions are met:
12 *
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.
18 *
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.
30 *
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.
34 */
35
36 #include <sys/cdefs.h>
37 #include <sys/param.h>
38 #include <sys/bus.h>
39 #include <sys/kernel.h>
40 #include <sys/malloc.h>
41 #include <sys/queue.h>
42 #include <sys/taskqueue.h>
43
44 #include <machine/bus.h>
45
46 #include "common/efx.h"
47
48 #include "sfxge.h"
49
50 static void
sfxge_dma_cb(void * arg,bus_dma_segment_t * segs,int nseg,int error)51 sfxge_dma_cb(void *arg, bus_dma_segment_t *segs, int nseg, int error)
52 {
53 bus_addr_t *addr;
54
55 addr = arg;
56
57 if (error != 0) {
58 *addr = 0;
59 return;
60 }
61
62 *addr = segs[0].ds_addr;
63 }
64
65 int
sfxge_dma_map_sg_collapse(bus_dma_tag_t tag,bus_dmamap_t map,struct mbuf ** mp,bus_dma_segment_t * segs,int * nsegs,int maxsegs)66 sfxge_dma_map_sg_collapse(bus_dma_tag_t tag, bus_dmamap_t map,
67 struct mbuf **mp, bus_dma_segment_t *segs,
68 int *nsegs, int maxsegs)
69 {
70 bus_dma_segment_t *psegs;
71 struct mbuf *m;
72 int seg_count;
73 int defragged;
74 int err;
75
76 m = *mp;
77 defragged = err = seg_count = 0;
78
79 KASSERT(m->m_pkthdr.len, ("packet has zero header length"));
80
81 retry:
82 psegs = segs;
83 seg_count = 0;
84 if (m->m_next == NULL) {
85 sfxge_map_mbuf_fast(tag, map, m, segs);
86 *nsegs = 1;
87 return (0);
88 }
89 #if defined(__i386__) || defined(__amd64__)
90 while (m != NULL && seg_count < maxsegs) {
91 /*
92 * firmware doesn't like empty segments
93 */
94 if (m->m_len != 0) {
95 seg_count++;
96 sfxge_map_mbuf_fast(tag, map, m, psegs);
97 psegs++;
98 }
99 m = m->m_next;
100 }
101 #else
102 err = bus_dmamap_load_mbuf_sg(tag, map, *mp, segs, &seg_count, 0);
103 #endif
104 if (seg_count == 0) {
105 err = EFBIG;
106 goto err_out;
107 } else if (err == EFBIG || seg_count >= maxsegs) {
108 if (!defragged) {
109 m = m_defrag(*mp, M_NOWAIT);
110 if (m == NULL) {
111 err = ENOBUFS;
112 goto err_out;
113 }
114 *mp = m;
115 defragged = 1;
116 goto retry;
117 }
118 err = EFBIG;
119 goto err_out;
120 }
121 *nsegs = seg_count;
122
123 err_out:
124 return (err);
125 }
126
127 void
sfxge_dma_free(efsys_mem_t * esmp)128 sfxge_dma_free(efsys_mem_t *esmp)
129 {
130
131 bus_dmamap_unload(esmp->esm_tag, esmp->esm_map);
132 bus_dmamem_free(esmp->esm_tag, esmp->esm_base, esmp->esm_map);
133 bus_dma_tag_destroy(esmp->esm_tag);
134
135 esmp->esm_addr = 0;
136 esmp->esm_base = NULL;
137 esmp->esm_size = 0;
138 }
139
140 int
sfxge_dma_alloc(struct sfxge_softc * sc,bus_size_t len,efsys_mem_t * esmp)141 sfxge_dma_alloc(struct sfxge_softc *sc, bus_size_t len, efsys_mem_t *esmp)
142 {
143 void *vaddr;
144
145 /* Create the child DMA tag. */
146 if (bus_dma_tag_create(sc->parent_dma_tag, PAGE_SIZE, 0,
147 MIN(0x3FFFFFFFFFFFUL, BUS_SPACE_MAXADDR), BUS_SPACE_MAXADDR, NULL,
148 NULL, len, 1, len, 0, NULL, NULL, &esmp->esm_tag) != 0) {
149 device_printf(sc->dev, "Couldn't allocate txq DMA tag\n");
150 goto fail_tag_create;
151 }
152
153 /* Allocate kernel memory. */
154 if (bus_dmamem_alloc(esmp->esm_tag, (void **)&vaddr,
155 BUS_DMA_WAITOK | BUS_DMA_COHERENT | BUS_DMA_ZERO,
156 &esmp->esm_map) != 0) {
157 device_printf(sc->dev, "Couldn't allocate DMA memory\n");
158 goto fail_alloc;
159 }
160
161 /* Load map into device memory. */
162 if (bus_dmamap_load(esmp->esm_tag, esmp->esm_map, vaddr, len,
163 sfxge_dma_cb, &esmp->esm_addr, 0) != 0) {
164 device_printf(sc->dev, "Couldn't load DMA mapping\n");
165 goto fail_load;
166 }
167
168 /*
169 * The callback gets error information about the mapping
170 * and will have set esm_addr to 0 if something went
171 * wrong.
172 */
173 if (esmp->esm_addr == 0)
174 goto fail_load_check;
175
176 esmp->esm_base = vaddr;
177 esmp->esm_size = len;
178
179 return (0);
180
181 fail_load_check:
182 fail_load:
183 bus_dmamem_free(esmp->esm_tag, vaddr, esmp->esm_map);
184 fail_alloc:
185 bus_dma_tag_destroy(esmp->esm_tag);
186 fail_tag_create:
187 return (ENOMEM);
188 }
189
190 void
sfxge_dma_fini(struct sfxge_softc * sc)191 sfxge_dma_fini(struct sfxge_softc *sc)
192 {
193
194 bus_dma_tag_destroy(sc->parent_dma_tag);
195 }
196
197 int
sfxge_dma_init(struct sfxge_softc * sc)198 sfxge_dma_init(struct sfxge_softc *sc)
199 {
200
201 /* Create the parent dma tag. */
202 if (bus_dma_tag_create(bus_get_dma_tag(sc->dev), /* parent */
203 1, 0, /* algnmnt, boundary */
204 BUS_SPACE_MAXADDR, /* lowaddr */
205 BUS_SPACE_MAXADDR, /* highaddr */
206 NULL, NULL, /* filter, filterarg */
207 BUS_SPACE_MAXSIZE_32BIT, /* maxsize */
208 BUS_SPACE_UNRESTRICTED, /* nsegments */
209 BUS_SPACE_MAXSIZE_32BIT, /* maxsegsize */
210 0, /* flags */
211 NULL, NULL, /* lock, lockarg */
212 &sc->parent_dma_tag) != 0) {
213 device_printf(sc->dev, "Cannot allocate parent DMA tag\n");
214 return (ENOMEM);
215 }
216
217 return (0);
218 }
219