2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2007-2008 Kip Macy <kmacy@freebsd.org>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/kernel.h>
36 #include <sys/malloc.h>
43 #include <machine/bus.h>
45 #include <cxgb_include.h>
49 #define M_SANITY m_sanity
51 #define M_SANITY(a, b)
55 busdma_map_sg_collapse(bus_dma_tag_t tag, bus_dmamap_t map,
56 struct mbuf **m, bus_dma_segment_t *segs, int *nsegs)
59 int seg_count, defragged = 0, err = 0;
60 bus_dma_segment_t *psegs;
62 KASSERT(n->m_pkthdr.len, ("packet has zero header len"));
63 if (n->m_pkthdr.len <= PIO_LEN)
68 if (n->m_next == NULL) {
69 busdma_map_mbuf_fast(tag, map, n, segs);
73 #if defined(__i386__) || defined(__amd64__)
74 while (n && seg_count < TX_MAX_SEGS) {
76 * firmware doesn't like empty segments
78 if (__predict_true(n->m_len != 0)) {
80 busdma_map_mbuf_fast(tag, map, n, psegs);
86 err = bus_dmamap_load_mbuf_sg(tag, map, *m, segs, &seg_count, 0);
90 printf("empty segment chain\n");
93 } else if (err == EFBIG || seg_count >= TX_MAX_SEGS) {
95 printf("mbuf chain too long: %d max allowed %d\n",
96 seg_count, TX_MAX_SEGS);
98 n = m_defrag(*m, M_NOWAIT);
117 busdma_map_sg_vec(bus_dma_tag_t tag, bus_dmamap_t map,
118 struct mbuf *m, bus_dma_segment_t *segs, int *nsegs)
121 for (*nsegs = 0; m != NULL ; segs++, *nsegs += 1, m = m->m_nextpkt)
122 busdma_map_mbuf_fast(tag, map, m, segs);