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/param.h>
37 #include <sys/bus.h>
38 #include <sys/kernel.h>
39 #include <sys/malloc.h>
40 #include <sys/queue.h>
41 #include <sys/taskqueue.h>
42
43 #include <machine/bus.h>
44
45 #include "common/efx.h"
46
47 #include "sfxge.h"
48
49 static void
sfxge_dma_cb(void * arg,bus_dma_segment_t * segs,int nseg,int error)50 sfxge_dma_cb(void *arg, bus_dma_segment_t *segs, int nseg, int error)
51 {
52 bus_addr_t *addr;
53
54 addr = arg;
55
56 if (error != 0) {
57 *addr = 0;
58 return;
59 }
60
61 *addr = segs[0].ds_addr;
62 }
63
64 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)65 sfxge_dma_map_sg_collapse(bus_dma_tag_t tag, bus_dmamap_t map,
66 struct mbuf **mp, bus_dma_segment_t *segs,
67 int *nsegs, int maxsegs)
68 {
69 bus_dma_segment_t *psegs;
70 struct mbuf *m;
71 int seg_count;
72 int defragged;
73 int err;
74
75 m = *mp;
76 defragged = err = seg_count = 0;
77
78 KASSERT(m->m_pkthdr.len, ("packet has zero header length"));
79
80 retry:
81 psegs = segs;
82 seg_count = 0;
83 if (m->m_next == NULL) {
84 sfxge_map_mbuf_fast(tag, map, m, segs);
85 *nsegs = 1;
86 return (0);
87 }
88 #if defined(__i386__) || defined(__amd64__)
89 while (m != NULL && seg_count < maxsegs) {
90 /*
91 * firmware doesn't like empty segments
92 */
93 if (m->m_len != 0) {
94 seg_count++;
95 sfxge_map_mbuf_fast(tag, map, m, psegs);
96 psegs++;
97 }
98 m = m->m_next;
99 }
100 #else
101 err = bus_dmamap_load_mbuf_sg(tag, map, *mp, segs, &seg_count, 0);
102 #endif
103 if (seg_count == 0) {
104 err = EFBIG;
105 goto err_out;
106 } else if (err == EFBIG || seg_count >= maxsegs) {
107 if (!defragged) {
108 m = m_defrag(*mp, M_NOWAIT);
109 if (m == NULL) {
110 err = ENOBUFS;
111 goto err_out;
112 }
113 *mp = m;
114 defragged = 1;
115 goto retry;
116 }
117 err = EFBIG;
118 goto err_out;
119 }
120 *nsegs = seg_count;
121
122 err_out:
123 return (err);
124 }
125
126 void
sfxge_dma_free(efsys_mem_t * esmp)127 sfxge_dma_free(efsys_mem_t *esmp)
128 {
129
130 bus_dmamap_unload(esmp->esm_tag, esmp->esm_map);
131 bus_dmamem_free(esmp->esm_tag, esmp->esm_base, esmp->esm_map);
132 bus_dma_tag_destroy(esmp->esm_tag);
133
134 esmp->esm_addr = 0;
135 esmp->esm_base = NULL;
136 esmp->esm_size = 0;
137 }
138
139 int
sfxge_dma_alloc(struct sfxge_softc * sc,bus_size_t len,efsys_mem_t * esmp)140 sfxge_dma_alloc(struct sfxge_softc *sc, bus_size_t len, efsys_mem_t *esmp)
141 {
142 void *vaddr;
143
144 /* Create the child DMA tag. */
145 if (bus_dma_tag_create(sc->parent_dma_tag, PAGE_SIZE, 0,
146 MIN(0x3FFFFFFFFFFFUL, BUS_SPACE_MAXADDR), BUS_SPACE_MAXADDR, NULL,
147 NULL, len, 1, len, 0, NULL, NULL, &esmp->esm_tag) != 0) {
148 device_printf(sc->dev, "Couldn't allocate txq DMA tag\n");
149 goto fail_tag_create;
150 }
151
152 /* Allocate kernel memory. */
153 if (bus_dmamem_alloc(esmp->esm_tag, (void **)&vaddr,
154 BUS_DMA_WAITOK | BUS_DMA_COHERENT | BUS_DMA_ZERO,
155 &esmp->esm_map) != 0) {
156 device_printf(sc->dev, "Couldn't allocate DMA memory\n");
157 goto fail_alloc;
158 }
159
160 /* Load map into device memory. */
161 if (bus_dmamap_load(esmp->esm_tag, esmp->esm_map, vaddr, len,
162 sfxge_dma_cb, &esmp->esm_addr, 0) != 0) {
163 device_printf(sc->dev, "Couldn't load DMA mapping\n");
164 goto fail_load;
165 }
166
167 /*
168 * The callback gets error information about the mapping
169 * and will have set esm_addr to 0 if something went
170 * wrong.
171 */
172 if (esmp->esm_addr == 0)
173 goto fail_load_check;
174
175 esmp->esm_base = vaddr;
176 esmp->esm_size = len;
177
178 return (0);
179
180 fail_load_check:
181 fail_load:
182 bus_dmamem_free(esmp->esm_tag, vaddr, esmp->esm_map);
183 fail_alloc:
184 bus_dma_tag_destroy(esmp->esm_tag);
185 fail_tag_create:
186 return (ENOMEM);
187 }
188
189 void
sfxge_dma_fini(struct sfxge_softc * sc)190 sfxge_dma_fini(struct sfxge_softc *sc)
191 {
192
193 bus_dma_tag_destroy(sc->parent_dma_tag);
194 }
195
196 int
sfxge_dma_init(struct sfxge_softc * sc)197 sfxge_dma_init(struct sfxge_softc *sc)
198 {
199
200 /* Create the parent dma tag. */
201 if (bus_dma_tag_create(bus_get_dma_tag(sc->dev), /* parent */
202 1, 0, /* algnmnt, boundary */
203 BUS_SPACE_MAXADDR, /* lowaddr */
204 BUS_SPACE_MAXADDR, /* highaddr */
205 NULL, NULL, /* filter, filterarg */
206 BUS_SPACE_MAXSIZE_32BIT, /* maxsize */
207 BUS_SPACE_UNRESTRICTED, /* nsegments */
208 BUS_SPACE_MAXSIZE_32BIT, /* maxsegsize */
209 0, /* flags */
210 NULL, NULL, /* lock, lockarg */
211 &sc->parent_dma_tag) != 0) {
212 device_printf(sc->dev, "Cannot allocate parent DMA tag\n");
213 return (ENOMEM);
214 }
215
216 return (0);
217 }
218