1/* $OpenBSD: if_rtwn.c,v 1.6 2015/08/28 00:03:53 deraadt Exp $ */ 2 3/*- 4 * Copyright (c) 2010 Damien Bergamini <damien.bergamini@free.fr> 5 * Copyright (c) 2015 Stefan Sperling <stsp@openbsd.org> 6 * Copyright (c) 2016 Andriy Voskoboinyk <avos@FreeBSD.org> 7 * 8 * Permission to use, copy, modify, and distribute this software for any 9 * purpose with or without fee is hereby granted, provided that the above 10 * copyright notice and this permission notice appear in all copies. 11 * 12 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 13 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 14 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 15 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 16 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 17 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 18 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 19 */ 20 21#include <sys/cdefs.h> 22__FBSDID("$FreeBSD$"); 23 24#include "opt_wlan.h" 25 26#include <sys/param.h> 27#include <sys/lock.h> 28#include <sys/mutex.h> 29#include <sys/mbuf.h> 30#include <sys/kernel.h> 31#include <sys/socket.h> 32#include <sys/systm.h> 33#include <sys/malloc.h> 34#include <sys/queue.h> 35#include <sys/taskqueue.h> 36#include <sys/bus.h> 37#include <sys/endian.h> 38 39#include <machine/bus.h> 40#include <machine/resource.h> 41#include <sys/rman.h> 42 43#include <net/if.h> 44#include <net/if_var.h> 45#include <net/ethernet.h> 46#include <net/if_media.h> 47 48#include <net80211/ieee80211_var.h> 49#include <net80211/ieee80211_radiotap.h> 50 51#include <dev/rtwn/if_rtwnreg.h> 52#include <dev/rtwn/if_rtwnvar.h> 53#include <dev/rtwn/if_rtwn_debug.h> 54 55#include <dev/rtwn/pci/rtwn_pci_var.h> 56#include <dev/rtwn/pci/rtwn_pci_tx.h> 57 58#include <dev/rtwn/rtl8192c/pci/r92ce_reg.h> 59 60static struct mbuf * 61rtwn_mbuf_defrag(struct mbuf *m0, int how) 62{ 63 struct mbuf *m = NULL; 64 65 KASSERT(m0->m_flags & M_PKTHDR, 66 ("M_PKTHDR flag is absent (m %p)!", m0)); 67 68 /* NB: we need _exactly_ one mbuf (no less, no more). */ 69 if (m0->m_pkthdr.len > MJUMPAGESIZE) { 70 /* XXX MJUM9BYTES? */ 71 return (NULL); 72 } else if (m0->m_pkthdr.len > MCLBYTES) { 73 m = m_getjcl(how, MT_DATA, M_PKTHDR, MJUMPAGESIZE); 74 if (m == NULL) 75 return (NULL); 76 77 if (m_dup_pkthdr(m, m0, how) == 0) { 78 m_freem(m); 79 return (NULL); 80 } 81 82 m_copydata(m0, 0, m0->m_pkthdr.len, mtod(m, caddr_t)); 83 m->m_len = m->m_pkthdr.len; 84 m_freem(m0); 85 86 return (m); 87 } else 88 return (m_defrag(m0, how)); 89} 90 91static int 92rtwn_pci_tx_start_frame(struct rtwn_softc *sc, struct ieee80211_node *ni, 93 struct mbuf *m, uint8_t *tx_desc, uint8_t type) 94{ 95 struct rtwn_pci_softc *pc = RTWN_PCI_SOFTC(sc); 96 struct rtwn_tx_ring *ring; 97 struct rtwn_tx_data *data; 98 struct rtwn_tx_desc_common *txd; 99 bus_dma_segment_t segs[1]; 100 uint8_t qid; 101 int nsegs, error; 102 103 RTWN_ASSERT_LOCKED(sc); 104 105 switch (type) { 106 case IEEE80211_FC0_TYPE_CTL: 107 case IEEE80211_FC0_TYPE_MGT: 108 qid = RTWN_PCI_MGNT_QUEUE; 109 break; 110 default: 111 qid = M_WME_GETAC(m); 112 break; 113 } 114 115 ring = &pc->tx_ring[qid]; 116 data = &ring->tx_data[ring->cur]; 117 if (data->m != NULL) { 118 RTWN_DPRINTF(sc, RTWN_DEBUG_XMIT, 119 "%s: ring #%u is full (m %p)\n", __func__, qid, data->m); 120 return (ENOBUFS); 121 } 122 123 txd = (struct rtwn_tx_desc_common *) 124 ((uint8_t *)ring->desc + sc->txdesc_len * ring->cur); 125 if (txd->flags0 & RTWN_FLAGS0_OWN) { 126 device_printf(sc->sc_dev, 127 "%s: OWN bit is set (tx desc %d, ring %u)!\n", 128 __func__, ring->cur, qid); 129 return (ENOBUFS); 130 } 131 132 /* Copy Tx descriptor. */ 133 rtwn_pci_copy_tx_desc(pc, txd, tx_desc); 134 txd->pktlen = htole16(m->m_pkthdr.len); 135 txd->offset = sc->txdesc_len; 136 137 error = bus_dmamap_load_mbuf_sg(ring->data_dmat, data->map, m, segs, 138 &nsegs, BUS_DMA_NOWAIT); 139 if (error != 0 && error != EFBIG) { 140 device_printf(sc->sc_dev, "can't map mbuf (error %d)\n", 141 error); 142 return (error); 143 } 144 if (error != 0) { 145 struct mbuf *mnew; 146 147 mnew = rtwn_mbuf_defrag(m, M_NOWAIT); 148 if (mnew == NULL) { 149 device_printf(sc->sc_dev, "can't defragment mbuf\n"); 150 return (ENOBUFS); 151 } 152 m = mnew; 153 154 error = bus_dmamap_load_mbuf_sg(ring->data_dmat, data->map, m, 155 segs, &nsegs, BUS_DMA_NOWAIT); 156 if (error != 0) { 157 device_printf(sc->sc_dev, 158 "can't map mbuf (error %d)\n", error); 159 if (ni != NULL) { 160 if_inc_counter(ni->ni_vap->iv_ifp, 161 IFCOUNTER_OERRORS, 1); 162 ieee80211_free_node(ni); 163 } 164 m_freem(m); 165 return (0); /* XXX */ 166 } 167 } 168 169 rtwn_pci_tx_postsetup(pc, txd, segs); 170 txd->flags0 |= RTWN_FLAGS0_OWN; 171 172 /* Dump Tx descriptor. */ 173 rtwn_dump_tx_desc(sc, txd); 174 175 bus_dmamap_sync(ring->desc_dmat, ring->desc_map, 176 BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE); 177 bus_dmamap_sync(ring->data_dmat, data->map, BUS_DMASYNC_PREWRITE); 178 179 data->m = m; 180 data->ni = ni; 181 182 ring->cur = (ring->cur + 1) % RTWN_PCI_TX_LIST_COUNT; 183 184 ring->queued++; 185 if (ring->queued >= (RTWN_PCI_TX_LIST_COUNT - 1)) 186 sc->qfullmsk |= (1 << qid); 187 188#ifndef D4054 189 sc->sc_tx_timer = 5; 190#endif 191 192 /* Kick TX. */ 193 rtwn_write_2(sc, R92C_PCIE_CTRL_REG, (1 << qid)); 194 195 return (0); 196} 197 198static int 199rtwn_pci_tx_start_beacon(struct rtwn_softc *sc, struct mbuf *m, 200 uint8_t *tx_desc, int id) 201{ 202 struct rtwn_pci_softc *pc = RTWN_PCI_SOFTC(sc); 203 struct rtwn_tx_ring *ring; 204 struct rtwn_tx_data *data; 205 struct rtwn_tx_desc_common *txd; 206 bus_dma_segment_t segs[1]; 207 int nsegs, error, own; 208 209 RTWN_ASSERT_LOCKED(sc); 210 211 KASSERT(id == 0 || id == 1, ("bogus vap id %d\n", id)); 212 213 ring = &pc->tx_ring[RTWN_PCI_BEACON_QUEUE]; 214 data = &ring->tx_data[id]; 215 txd = (struct rtwn_tx_desc_common *) 216 ((uint8_t *)ring->desc + id * sc->txdesc_len); 217 218 bus_dmamap_sync(ring->desc_dmat, ring->desc_map, 219 BUS_DMASYNC_POSTREAD); 220 own = !!(txd->flags0 & RTWN_FLAGS0_OWN); 221 error = 0; 222 if (!own || txd->pktlen != htole16(m->m_pkthdr.len)) { 223 if (!own) { 224 /* Copy Tx descriptor. */ 225 rtwn_pci_copy_tx_desc(pc, txd, tx_desc); 226 txd->offset = sc->txdesc_len; 227 } else { 228 /* Reload mbuf. */ 229 bus_dmamap_unload(ring->data_dmat, data->map); 230 } 231 232 error = bus_dmamap_load_mbuf_sg(ring->data_dmat, 233 data->map, m, segs, &nsegs, BUS_DMA_NOWAIT); 234 if (error != 0) { 235 device_printf(sc->sc_dev, 236 "can't map beacon (error %d)\n", error); 237 txd->flags0 &= ~RTWN_FLAGS0_OWN; 238 goto end; 239 } 240 241 txd->pktlen = htole16(m->m_pkthdr.len); 242 rtwn_pci_tx_postsetup(pc, txd, segs); 243 txd->flags0 |= RTWN_FLAGS0_OWN; 244end: 245 bus_dmamap_sync(ring->desc_dmat, ring->desc_map, 246 BUS_DMASYNC_PREWRITE); 247 } 248 249 /* Dump Tx descriptor. */ 250 rtwn_dump_tx_desc(sc, txd); 251 252 bus_dmamap_sync(ring->data_dmat, data->map, BUS_DMASYNC_PREWRITE); 253 254 return (0); 255} 256 257int 258rtwn_pci_tx_start(struct rtwn_softc *sc, struct ieee80211_node *ni, 259 struct mbuf *m, uint8_t *tx_desc, uint8_t type, int id) 260{ 261 int error = 0; 262 263 RTWN_ASSERT_LOCKED(sc); 264 265 if (ni == NULL) /* beacon frame */ 266 error = rtwn_pci_tx_start_beacon(sc, m, tx_desc, id); 267 else 268 error = rtwn_pci_tx_start_frame(sc, ni, m, tx_desc, type); 269 270 return (error); 271} 272