1227614Sluigi/* 2262151Sluigi * Copyright (C) 2011-2014 Luigi Rizzo. All rights reserved. 3227614Sluigi * 4227614Sluigi * Redistribution and use in source and binary forms, with or without 5227614Sluigi * modification, are permitted provided that the following conditions 6227614Sluigi * are met: 7227614Sluigi * 1. Redistributions of source code must retain the above copyright 8227614Sluigi * notice, this list of conditions and the following disclaimer. 9227614Sluigi * 2. Redistributions in binary form must reproduce the above copyright 10227614Sluigi * notice, this list of conditions and the following disclaimer in the 11227614Sluigi * documentation and/or other materials provided with the distribution. 12227614Sluigi * 13227614Sluigi * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14227614Sluigi * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15227614Sluigi * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16227614Sluigi * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17227614Sluigi * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18227614Sluigi * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19227614Sluigi * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20227614Sluigi * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21227614Sluigi * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22227614Sluigi * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23227614Sluigi * SUCH DAMAGE. 24227614Sluigi */ 25227614Sluigi 26227614Sluigi/* 27227614Sluigi * $FreeBSD: releng/10.3/sys/dev/netmap/if_re_netmap.h 278779 2015-02-14 19:41:26Z luigi $ 28227614Sluigi * 29262151Sluigi * netmap support for: re 30262151Sluigi * 31262151Sluigi * For more details on netmap support please see ixgbe_netmap.h 32227614Sluigi */ 33227614Sluigi 34232238Sluigi 35227614Sluigi#include <net/netmap.h> 36227614Sluigi#include <sys/selinfo.h> 37227614Sluigi#include <vm/vm.h> 38227614Sluigi#include <vm/pmap.h> /* vtophys ? */ 39227614Sluigi#include <dev/netmap/netmap_kern.h> 40227614Sluigi 41227614Sluigi 42227614Sluigi/* 43262151Sluigi * Register/unregister. We are already under netmap lock. 44227614Sluigi */ 45227614Sluigistatic int 46262151Sluigire_netmap_reg(struct netmap_adapter *na, int onoff) 47227614Sluigi{ 48262151Sluigi struct ifnet *ifp = na->ifp; 49227614Sluigi struct rl_softc *adapter = ifp->if_softc; 50227614Sluigi 51262151Sluigi RL_LOCK(adapter); 52262151Sluigi re_stop(adapter); /* also clears IFF_DRV_RUNNING */ 53227614Sluigi if (onoff) { 54262151Sluigi nm_set_native_flags(na); 55227614Sluigi } else { 56262151Sluigi nm_clear_native_flags(na); 57227614Sluigi } 58262151Sluigi re_init_locked(adapter); /* also enables intr */ 59262151Sluigi RL_UNLOCK(adapter); 60262151Sluigi return (ifp->if_drv_flags & IFF_DRV_RUNNING ? 0 : 1); 61227614Sluigi} 62227614Sluigi 63227614Sluigi 64227614Sluigi/* 65227614Sluigi * Reconcile kernel and user view of the transmit ring. 66227614Sluigi */ 67227614Sluigistatic int 68270252Sluigire_netmap_txsync(struct netmap_kring *kring, int flags) 69227614Sluigi{ 70270252Sluigi struct netmap_adapter *na = kring->na; 71262151Sluigi struct ifnet *ifp = na->ifp; 72227614Sluigi struct netmap_ring *ring = kring->ring; 73262151Sluigi u_int nm_i; /* index into the netmap ring */ 74262151Sluigi u_int nic_i; /* index into the NIC ring */ 75262151Sluigi u_int n; 76262151Sluigi u_int const lim = kring->nkr_num_slots - 1; 77262151Sluigi u_int const head = kring->rhead; 78227614Sluigi 79262151Sluigi /* device-specific */ 80262151Sluigi struct rl_softc *sc = ifp->if_softc; 81262151Sluigi struct rl_txdesc *txd = sc->rl_ldata.rl_tx_desc; 82227614Sluigi 83227614Sluigi bus_dmamap_sync(sc->rl_ldata.rl_tx_list_tag, 84262151Sluigi sc->rl_ldata.rl_tx_list_map, 85262151Sluigi BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE); // XXX extra postwrite ? 86227614Sluigi 87262151Sluigi /* 88262151Sluigi * First part: process new packets to send. 89262151Sluigi */ 90262151Sluigi nm_i = kring->nr_hwcur; 91262151Sluigi if (nm_i != head) { /* we have new packets to send */ 92262151Sluigi nic_i = sc->rl_ldata.rl_tx_prodidx; 93262151Sluigi // XXX or netmap_idx_k2n(kring, nm_i); 94227614Sluigi 95262151Sluigi for (n = 0; nm_i != head; n++) { 96262151Sluigi struct netmap_slot *slot = &ring->slot[nm_i]; 97262151Sluigi u_int len = slot->len; 98262151Sluigi uint64_t paddr; 99270252Sluigi void *addr = PNMB(na, slot, &paddr); 100250184Sluigi 101262151Sluigi /* device-specific */ 102262151Sluigi struct rl_desc *desc = &sc->rl_ldata.rl_tx_list[nic_i]; 103227614Sluigi int cmd = slot->len | RL_TDESC_CMD_EOF | 104227614Sluigi RL_TDESC_CMD_OWN | RL_TDESC_CMD_SOF ; 105227614Sluigi 106270252Sluigi NM_CHECK_ADDR_LEN(na, addr, len); 107250184Sluigi 108262151Sluigi if (nic_i == lim) /* mark end of ring */ 109227614Sluigi cmd |= RL_TDESC_CMD_EOR; 110227614Sluigi 111227614Sluigi if (slot->flags & NS_BUF_CHANGED) { 112262151Sluigi /* buffer has changed, reload map */ 113227614Sluigi desc->rl_bufaddr_lo = htole32(RL_ADDR_LO(paddr)); 114227614Sluigi desc->rl_bufaddr_hi = htole32(RL_ADDR_HI(paddr)); 115270252Sluigi netmap_reload_map(na, sc->rl_ldata.rl_tx_mtag, 116262151Sluigi txd[nic_i].tx_dmamap, addr); 117227614Sluigi } 118262151Sluigi slot->flags &= ~(NS_REPORT | NS_BUF_CHANGED); 119262151Sluigi 120262151Sluigi /* Fill the slot in the NIC ring. */ 121227614Sluigi desc->rl_cmdstat = htole32(cmd); 122262151Sluigi 123262151Sluigi /* make sure changes to the buffer are synced */ 124227614Sluigi bus_dmamap_sync(sc->rl_ldata.rl_tx_mtag, 125262151Sluigi txd[nic_i].tx_dmamap, 126262151Sluigi BUS_DMASYNC_PREWRITE); 127262151Sluigi 128262151Sluigi nm_i = nm_next(nm_i, lim); 129262151Sluigi nic_i = nm_next(nic_i, lim); 130227614Sluigi } 131262151Sluigi sc->rl_ldata.rl_tx_prodidx = nic_i; 132262151Sluigi kring->nr_hwcur = head; 133227614Sluigi 134262151Sluigi /* synchronize the NIC ring */ 135227614Sluigi bus_dmamap_sync(sc->rl_ldata.rl_tx_list_tag, 136262151Sluigi sc->rl_ldata.rl_tx_list_map, 137262151Sluigi BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE); 138227614Sluigi 139227614Sluigi /* start ? */ 140227614Sluigi CSR_WRITE_1(sc, sc->rl_txstart, RL_TXSTART_START); 141227614Sluigi } 142262151Sluigi 143262151Sluigi /* 144262151Sluigi * Second part: reclaim buffers for completed transmissions. 145262151Sluigi */ 146262151Sluigi if (flags & NAF_FORCE_RECLAIM || nm_kr_txempty(kring)) { 147262151Sluigi nic_i = sc->rl_ldata.rl_tx_considx; 148262151Sluigi for (n = 0; nic_i != sc->rl_ldata.rl_tx_prodidx; 149262151Sluigi n++, nic_i = RL_TX_DESC_NXT(sc, nic_i)) { 150262151Sluigi uint32_t cmdstat = 151262151Sluigi le32toh(sc->rl_ldata.rl_tx_list[nic_i].rl_cmdstat); 152262151Sluigi if (cmdstat & RL_TDESC_STAT_OWN) 153262151Sluigi break; 154262151Sluigi } 155262151Sluigi if (n > 0) { 156262151Sluigi sc->rl_ldata.rl_tx_considx = nic_i; 157262151Sluigi sc->rl_ldata.rl_tx_free += n; 158262151Sluigi kring->nr_hwtail = nm_prev(netmap_idx_n2k(kring, nic_i), lim); 159262151Sluigi } 160262151Sluigi } 161262151Sluigi 162262151Sluigi nm_txsync_finalize(kring); 163262151Sluigi 164227614Sluigi return 0; 165227614Sluigi} 166227614Sluigi 167227614Sluigi 168227614Sluigi/* 169227614Sluigi * Reconcile kernel and user view of the receive ring. 170227614Sluigi */ 171227614Sluigistatic int 172270252Sluigire_netmap_rxsync(struct netmap_kring *kring, int flags) 173227614Sluigi{ 174270252Sluigi struct netmap_adapter *na = kring->na; 175262151Sluigi struct ifnet *ifp = na->ifp; 176227614Sluigi struct netmap_ring *ring = kring->ring; 177262151Sluigi u_int nm_i; /* index into the netmap ring */ 178262151Sluigi u_int nic_i; /* index into the NIC ring */ 179262151Sluigi u_int n; 180262151Sluigi u_int const lim = kring->nkr_num_slots - 1; 181262151Sluigi u_int const head = nm_rxsync_prologue(kring); 182262151Sluigi int force_update = (flags & NAF_FORCE_READ) || kring->nr_kflags & NKR_PENDINTR; 183227614Sluigi 184262151Sluigi /* device-specific */ 185262151Sluigi struct rl_softc *sc = ifp->if_softc; 186262151Sluigi struct rl_rxdesc *rxd = sc->rl_ldata.rl_rx_desc; 187262151Sluigi 188262151Sluigi if (head > lim) 189227614Sluigi return netmap_ring_reinit(kring); 190227614Sluigi 191227614Sluigi bus_dmamap_sync(sc->rl_ldata.rl_rx_list_tag, 192262151Sluigi sc->rl_ldata.rl_rx_list_map, 193262151Sluigi BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE); 194227614Sluigi 195227614Sluigi /* 196262151Sluigi * First part: import newly received packets. 197232238Sluigi * 198262151Sluigi * This device uses all the buffers in the ring, so we need 199227614Sluigi * another termination condition in addition to RL_RDESC_STAT_OWN 200262151Sluigi * cleared (all buffers could have it cleared). The easiest one 201262151Sluigi * is to stop right before nm_hwcur. 202227614Sluigi */ 203232238Sluigi if (netmap_no_pendintr || force_update) { 204245579Sluigi uint16_t slot_flags = kring->nkr_slot_flags; 205262151Sluigi uint32_t stop_i = nm_prev(kring->nr_hwcur, lim); 206245579Sluigi 207262151Sluigi nic_i = sc->rl_ldata.rl_rx_prodidx; /* next pkt to check */ 208262151Sluigi nm_i = netmap_idx_n2k(kring, nic_i); 209262151Sluigi 210262151Sluigi while (nm_i != stop_i) { 211262151Sluigi struct rl_desc *cur_rx = &sc->rl_ldata.rl_rx_list[nic_i]; 212232238Sluigi uint32_t rxstat = le32toh(cur_rx->rl_cmdstat); 213232238Sluigi uint32_t total_len; 214227614Sluigi 215232238Sluigi if ((rxstat & RL_RDESC_STAT_OWN) != 0) 216232238Sluigi break; 217232238Sluigi total_len = rxstat & sc->rl_rxlenmask; 218232238Sluigi /* XXX subtract crc */ 219232238Sluigi total_len = (total_len < 4) ? 0 : total_len - 4; 220262151Sluigi ring->slot[nm_i].len = total_len; 221262151Sluigi ring->slot[nm_i].flags = slot_flags; 222232238Sluigi /* sync was in re_newbuf() */ 223232238Sluigi bus_dmamap_sync(sc->rl_ldata.rl_rx_mtag, 224262151Sluigi rxd[nic_i].rx_dmamap, BUS_DMASYNC_POSTREAD); 225278779Sluigi // if_inc_counter(sc->rl_ifp, IFCOUNTER_IPACKETS, 1); 226262151Sluigi nm_i = nm_next(nm_i, lim); 227262151Sluigi nic_i = nm_next(nic_i, lim); 228232238Sluigi } 229262151Sluigi sc->rl_ldata.rl_rx_prodidx = nic_i; 230262151Sluigi kring->nr_hwtail = nm_i; 231232238Sluigi kring->nr_kflags &= ~NKR_PENDINTR; 232227614Sluigi } 233227614Sluigi 234262151Sluigi /* 235262151Sluigi * Second part: skip past packets that userspace has released. 236262151Sluigi */ 237262151Sluigi nm_i = kring->nr_hwcur; 238262151Sluigi if (nm_i != head) { 239262151Sluigi nic_i = netmap_idx_k2n(kring, nm_i); 240262151Sluigi for (n = 0; nm_i != head; n++) { 241262151Sluigi struct netmap_slot *slot = &ring->slot[nm_i]; 242229939Sluigi uint64_t paddr; 243270252Sluigi void *addr = PNMB(na, slot, &paddr); 244227614Sluigi 245262151Sluigi struct rl_desc *desc = &sc->rl_ldata.rl_rx_list[nic_i]; 246270252Sluigi int cmd = NETMAP_BUF_SIZE(na) | RL_RDESC_CMD_OWN; 247227614Sluigi 248270252Sluigi if (addr == NETMAP_BUF_BASE(na)) /* bad buf */ 249262151Sluigi goto ring_reset; 250262151Sluigi 251262151Sluigi if (nic_i == lim) /* mark end of ring */ 252227614Sluigi cmd |= RL_RDESC_CMD_EOR; 253227614Sluigi 254227614Sluigi if (slot->flags & NS_BUF_CHANGED) { 255262151Sluigi /* buffer has changed, reload map */ 256227614Sluigi desc->rl_bufaddr_lo = htole32(RL_ADDR_LO(paddr)); 257227614Sluigi desc->rl_bufaddr_hi = htole32(RL_ADDR_HI(paddr)); 258270252Sluigi netmap_reload_map(na, sc->rl_ldata.rl_rx_mtag, 259262151Sluigi rxd[nic_i].rx_dmamap, addr); 260227614Sluigi slot->flags &= ~NS_BUF_CHANGED; 261227614Sluigi } 262232238Sluigi desc->rl_cmdstat = htole32(cmd); 263227614Sluigi bus_dmamap_sync(sc->rl_ldata.rl_rx_mtag, 264262151Sluigi rxd[nic_i].rx_dmamap, 265262151Sluigi BUS_DMASYNC_PREREAD); 266262151Sluigi nm_i = nm_next(nm_i, lim); 267262151Sluigi nic_i = nm_next(nic_i, lim); 268227614Sluigi } 269262151Sluigi kring->nr_hwcur = head; 270227614Sluigi 271227614Sluigi bus_dmamap_sync(sc->rl_ldata.rl_rx_list_tag, 272227614Sluigi sc->rl_ldata.rl_rx_list_map, 273262151Sluigi BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE); 274227614Sluigi } 275262151Sluigi 276262151Sluigi /* tell userspace that there might be new packets */ 277262151Sluigi nm_rxsync_finalize(kring); 278262151Sluigi 279227614Sluigi return 0; 280262151Sluigi 281262151Sluigiring_reset: 282262151Sluigi return netmap_ring_reinit(kring); 283227614Sluigi} 284227614Sluigi 285262151Sluigi 286228276Sluigi/* 287228276Sluigi * Additional routines to init the tx and rx rings. 288228276Sluigi * In other drivers we do that inline in the main code. 289228276Sluigi */ 290227614Sluigistatic void 291227614Sluigire_netmap_tx_init(struct rl_softc *sc) 292250184Sluigi{ 293227614Sluigi struct rl_txdesc *txd; 294227614Sluigi struct rl_desc *desc; 295228276Sluigi int i, n; 296227614Sluigi struct netmap_adapter *na = NA(sc->rl_ifp); 297262151Sluigi struct netmap_slot *slot; 298227614Sluigi 299262151Sluigi slot = netmap_reset(na, NR_TX, 0, 0); 300270252Sluigi /* slot is NULL if we are not in native netmap mode */ 301227614Sluigi if (!slot) 302270252Sluigi return; 303227614Sluigi /* in netmap mode, overwrite addresses and maps */ 304227614Sluigi txd = sc->rl_ldata.rl_tx_desc; 305227614Sluigi desc = sc->rl_ldata.rl_tx_list; 306228276Sluigi n = sc->rl_ldata.rl_tx_desc_cnt; 307227614Sluigi 308228276Sluigi /* l points in the netmap ring, i points in the NIC ring */ 309228276Sluigi for (i = 0; i < n; i++) { 310228276Sluigi uint64_t paddr; 311232238Sluigi int l = netmap_idx_n2k(&na->tx_rings[0], i); 312270252Sluigi void *addr = PNMB(na, slot + l, &paddr); 313227614Sluigi 314227614Sluigi desc[i].rl_bufaddr_lo = htole32(RL_ADDR_LO(paddr)); 315227614Sluigi desc[i].rl_bufaddr_hi = htole32(RL_ADDR_HI(paddr)); 316270252Sluigi netmap_load_map(na, sc->rl_ldata.rl_tx_mtag, 317229939Sluigi txd[i].tx_dmamap, addr); 318227614Sluigi } 319227614Sluigi} 320227614Sluigi 321227614Sluigistatic void 322227614Sluigire_netmap_rx_init(struct rl_softc *sc) 323227614Sluigi{ 324227614Sluigi struct netmap_adapter *na = NA(sc->rl_ifp); 325227614Sluigi struct netmap_slot *slot = netmap_reset(na, NR_RX, 0, 0); 326227614Sluigi struct rl_desc *desc = sc->rl_ldata.rl_rx_list; 327227614Sluigi uint32_t cmdstat; 328262151Sluigi uint32_t nic_i, max_avail; 329262151Sluigi uint32_t const n = sc->rl_ldata.rl_rx_desc_cnt; 330227614Sluigi 331227614Sluigi if (!slot) 332227614Sluigi return; 333231796Sluigi /* 334262151Sluigi * Do not release the slots owned by userspace, 335262151Sluigi * and also keep one empty. 336231796Sluigi */ 337262151Sluigi max_avail = n - 1 - nm_kr_rxspace(&na->rx_rings[0]); 338262151Sluigi for (nic_i = 0; nic_i < n; nic_i++) { 339228276Sluigi void *addr; 340228276Sluigi uint64_t paddr; 341262151Sluigi uint32_t nm_i = netmap_idx_n2k(&na->rx_rings[0], nic_i); 342227614Sluigi 343270252Sluigi addr = PNMB(na, slot + nm_i, &paddr); 344229939Sluigi 345270252Sluigi netmap_reload_map(na, sc->rl_ldata.rl_rx_mtag, 346262151Sluigi sc->rl_ldata.rl_rx_desc[nic_i].rx_dmamap, addr); 347229939Sluigi bus_dmamap_sync(sc->rl_ldata.rl_rx_mtag, 348262151Sluigi sc->rl_ldata.rl_rx_desc[nic_i].rx_dmamap, BUS_DMASYNC_PREREAD); 349262151Sluigi desc[nic_i].rl_bufaddr_lo = htole32(RL_ADDR_LO(paddr)); 350262151Sluigi desc[nic_i].rl_bufaddr_hi = htole32(RL_ADDR_HI(paddr)); 351270252Sluigi cmdstat = NETMAP_BUF_SIZE(na); 352262151Sluigi if (nic_i == n - 1) /* mark the end of ring */ 353227614Sluigi cmdstat |= RL_RDESC_CMD_EOR; 354262151Sluigi if (nic_i < max_avail) 355228276Sluigi cmdstat |= RL_RDESC_CMD_OWN; 356262151Sluigi desc[nic_i].rl_cmdstat = htole32(cmdstat); 357227614Sluigi } 358227614Sluigi} 359232238Sluigi 360232238Sluigi 361232238Sluigistatic void 362232238Sluigire_netmap_attach(struct rl_softc *sc) 363232238Sluigi{ 364232238Sluigi struct netmap_adapter na; 365232238Sluigi 366232238Sluigi bzero(&na, sizeof(na)); 367232238Sluigi 368232238Sluigi na.ifp = sc->rl_ifp; 369262151Sluigi na.na_flags = NAF_BDG_MAYSLEEP; 370232238Sluigi na.num_tx_desc = sc->rl_ldata.rl_tx_desc_cnt; 371232238Sluigi na.num_rx_desc = sc->rl_ldata.rl_rx_desc_cnt; 372232238Sluigi na.nm_txsync = re_netmap_txsync; 373232238Sluigi na.nm_rxsync = re_netmap_rxsync; 374232238Sluigi na.nm_register = re_netmap_reg; 375262151Sluigi na.num_tx_rings = na.num_rx_rings = 1; 376262151Sluigi netmap_attach(&na); 377232238Sluigi} 378262151Sluigi 379232238Sluigi/* end of file */ 380