1331722Seadler/* 2260368Sluigi * Copyright (C) 2011-2014 Matteo Landi, 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 26232238Sluigi 27227614Sluigi/* 28227614Sluigi * $FreeBSD: stable/11/sys/dev/netmap/if_lem_netmap.h 343771 2019-02-05 10:33:22Z vmaffione $ 29227614Sluigi * 30259412Sluigi * netmap support for: lem 31228276Sluigi * 32232238Sluigi * For details on netmap support please see ixgbe_netmap.h 33227614Sluigi */ 34227614Sluigi 35259412Sluigi 36227614Sluigi#include <net/netmap.h> 37227614Sluigi#include <sys/selinfo.h> 38227614Sluigi#include <dev/netmap/netmap_kern.h> 39227614Sluigi 40227614Sluigi/* 41259412Sluigi * Register/unregister. We are already under netmap lock. 42227614Sluigi */ 43227614Sluigistatic int 44259412Sluigilem_netmap_reg(struct netmap_adapter *na, int onoff) 45228276Sluigi{ 46259412Sluigi struct ifnet *ifp = na->ifp; 47228276Sluigi struct adapter *adapter = ifp->if_softc; 48228276Sluigi 49257529Sluigi EM_CORE_LOCK(adapter); 50257529Sluigi 51228276Sluigi lem_disable_intr(adapter); 52228276Sluigi 53228276Sluigi /* Tell the stack that the interface is no longer active */ 54228276Sluigi ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | IFF_DRV_OACTIVE); 55228276Sluigi 56228276Sluigi#ifndef EM_LEGACY_IRQ // XXX do we need this ? 57228276Sluigi taskqueue_block(adapter->tq); 58228276Sluigi taskqueue_drain(adapter->tq, &adapter->rxtx_task); 59228276Sluigi taskqueue_drain(adapter->tq, &adapter->link_task); 60228276Sluigi#endif /* !EM_LEGCY_IRQ */ 61259412Sluigi 62259412Sluigi /* enable or disable flags and callbacks in na and ifp */ 63228276Sluigi if (onoff) { 64259412Sluigi nm_set_native_flags(na); 65228276Sluigi } else { 66259412Sluigi nm_clear_native_flags(na); 67228276Sluigi } 68259412Sluigi lem_init_locked(adapter); /* also enable intr */ 69228276Sluigi 70228276Sluigi#ifndef EM_LEGACY_IRQ 71228276Sluigi taskqueue_unblock(adapter->tq); // XXX do we need this ? 72228276Sluigi#endif /* !EM_LEGCY_IRQ */ 73228276Sluigi 74257529Sluigi EM_CORE_UNLOCK(adapter); 75257529Sluigi 76259412Sluigi return (ifp->if_drv_flags & IFF_DRV_RUNNING ? 0 : 1); 77228276Sluigi} 78228276Sluigi 79228276Sluigi 80341477Svmaffionestatic void 81341477Svmaffionelem_netmap_intr(struct netmap_adapter *na, int onoff) 82341477Svmaffione{ 83341477Svmaffione struct ifnet *ifp = na->ifp; 84341477Svmaffione struct adapter *adapter = ifp->if_softc; 85341477Svmaffione 86341477Svmaffione EM_CORE_LOCK(adapter); 87341477Svmaffione if (onoff) { 88341477Svmaffione lem_enable_intr(adapter); 89341477Svmaffione } else { 90341477Svmaffione lem_disable_intr(adapter); 91341477Svmaffione } 92341477Svmaffione EM_CORE_UNLOCK(adapter); 93341477Svmaffione} 94341477Svmaffione 95341477Svmaffione 96228276Sluigi/* 97232238Sluigi * Reconcile kernel and user view of the transmit ring. 98228276Sluigi */ 99228276Sluigistatic int 100270063Sluigilem_netmap_txsync(struct netmap_kring *kring, int flags) 101227614Sluigi{ 102270063Sluigi struct netmap_adapter *na = kring->na; 103259412Sluigi struct ifnet *ifp = na->ifp; 104227614Sluigi struct netmap_ring *ring = kring->ring; 105259412Sluigi u_int nm_i; /* index into the netmap ring */ 106259412Sluigi u_int nic_i; /* index into the NIC ring */ 107259412Sluigi u_int const lim = kring->nkr_num_slots - 1; 108260368Sluigi u_int const head = kring->rhead; 109227614Sluigi /* generate an interrupt approximately every half ring */ 110259412Sluigi u_int report_frequency = kring->nkr_num_slots >> 1; 111227614Sluigi 112259412Sluigi /* device-specific */ 113259412Sluigi struct adapter *adapter = ifp->if_softc; 114259412Sluigi 115227614Sluigi bus_dmamap_sync(adapter->txdma.dma_tag, adapter->txdma.dma_map, 116227614Sluigi BUS_DMASYNC_POSTREAD); 117259412Sluigi 118232238Sluigi /* 119259412Sluigi * First part: process new packets to send. 120231778Sluigi */ 121259412Sluigi 122259412Sluigi nm_i = kring->nr_hwcur; 123260368Sluigi if (nm_i != head) { /* we have new packets to send */ 124259412Sluigi nic_i = netmap_idx_k2n(kring, nm_i); 125260368Sluigi while (nm_i != head) { 126259412Sluigi struct netmap_slot *slot = &ring->slot[nm_i]; 127259412Sluigi u_int len = slot->len; 128231778Sluigi uint64_t paddr; 129270063Sluigi void *addr = PNMB(na, slot, &paddr); 130227614Sluigi 131259412Sluigi /* device-specific */ 132259412Sluigi struct e1000_tx_desc *curr = &adapter->tx_desc_base[nic_i]; 133259412Sluigi struct em_buffer *txbuf = &adapter->tx_buffer_area[nic_i]; 134259412Sluigi int flags = (slot->flags & NS_REPORT || 135259412Sluigi nic_i == 0 || nic_i == report_frequency) ? 136259412Sluigi E1000_TXD_CMD_RS : 0; 137227614Sluigi 138270063Sluigi NM_CHECK_ADDR_LEN(na, addr, len); 139259412Sluigi 140259412Sluigi if (slot->flags & NS_BUF_CHANGED) { 141228276Sluigi /* buffer has changed, reload map */ 142259412Sluigi curr->buffer_addr = htole64(paddr); 143270063Sluigi netmap_reload_map(na, adapter->txtag, txbuf->map, addr); 144227614Sluigi } 145259412Sluigi slot->flags &= ~(NS_REPORT | NS_BUF_CHANGED); 146259412Sluigi 147259412Sluigi /* Fill the slot in the NIC ring. */ 148232238Sluigi curr->upper.data = 0; 149259412Sluigi curr->lower.data = htole32(adapter->txd_cmd | len | 150232238Sluigi (E1000_TXD_CMD_EOP | flags) ); 151259412Sluigi bus_dmamap_sync(adapter->txtag, txbuf->map, 152259412Sluigi BUS_DMASYNC_PREWRITE); 153227614Sluigi 154259412Sluigi nm_i = nm_next(nm_i, lim); 155259412Sluigi nic_i = nm_next(nic_i, lim); 156270063Sluigi // XXX might try an early kick 157227614Sluigi } 158260368Sluigi kring->nr_hwcur = head; 159227614Sluigi 160259412Sluigi /* synchronize the NIC ring */ 161227614Sluigi bus_dmamap_sync(adapter->txdma.dma_tag, adapter->txdma.dma_map, 162259412Sluigi BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE); 163227614Sluigi 164259412Sluigi /* (re)start the tx unit up to slot nic_i (excluded) */ 165259412Sluigi E1000_WRITE_REG(&adapter->hw, E1000_TDT(0), nic_i); 166227614Sluigi } 167228276Sluigi 168259412Sluigi /* 169259412Sluigi * Second part: reclaim buffers for completed transmissions. 170259412Sluigi */ 171260368Sluigi if (ticks != kring->last_reclaim || flags & NAF_FORCE_RECLAIM || nm_kr_txempty(kring)) { 172260368Sluigi kring->last_reclaim = ticks; 173228276Sluigi /* record completed transmissions using TDH */ 174259412Sluigi nic_i = E1000_READ_REG(&adapter->hw, E1000_TDH(0)); 175343771Svmaffione if (unlikely(nic_i >= kring->nkr_num_slots)) { 176343771Svmaffione nm_prerr("TDH wrap at idx %d", nic_i); 177259412Sluigi nic_i -= kring->nkr_num_slots; 178228276Sluigi } 179260368Sluigi adapter->next_tx_to_clean = nic_i; 180260368Sluigi kring->nr_hwtail = nm_prev(netmap_idx_n2k(kring, nic_i), lim); 181228276Sluigi } 182231198Sluigi 183227614Sluigi return 0; 184227614Sluigi} 185227614Sluigi 186227614Sluigi 187227614Sluigi/* 188228276Sluigi * Reconcile kernel and user view of the receive ring. 189227614Sluigi */ 190227614Sluigistatic int 191270063Sluigilem_netmap_rxsync(struct netmap_kring *kring, int flags) 192227614Sluigi{ 193270063Sluigi struct netmap_adapter *na = kring->na; 194259412Sluigi struct ifnet *ifp = na->ifp; 195227614Sluigi struct netmap_ring *ring = kring->ring; 196259412Sluigi u_int nm_i; /* index into the netmap ring */ 197259412Sluigi u_int nic_i; /* index into the NIC ring */ 198260368Sluigi u_int n; 199259412Sluigi u_int const lim = kring->nkr_num_slots - 1; 200285349Sluigi u_int const head = kring->rhead; 201257529Sluigi int force_update = (flags & NAF_FORCE_READ) || kring->nr_kflags & NKR_PENDINTR; 202227614Sluigi 203259412Sluigi /* device-specific */ 204259412Sluigi struct adapter *adapter = ifp->if_softc; 205259412Sluigi 206260368Sluigi if (head > lim) 207227614Sluigi return netmap_ring_reinit(kring); 208227614Sluigi 209227614Sluigi /* XXX check sync modes */ 210227614Sluigi bus_dmamap_sync(adapter->rxdma.dma_tag, adapter->rxdma.dma_map, 211227614Sluigi BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE); 212227614Sluigi 213232238Sluigi /* 214259412Sluigi * First part: import newly received packets. 215231778Sluigi */ 216232238Sluigi if (netmap_no_pendintr || force_update) { 217259412Sluigi nic_i = adapter->next_rx_desc_to_check; 218259412Sluigi nm_i = netmap_idx_n2k(kring, nic_i); 219259412Sluigi 220232238Sluigi for (n = 0; ; n++) { 221259412Sluigi struct e1000_rx_desc *curr = &adapter->rx_desc_base[nic_i]; 222232238Sluigi uint32_t staterr = le32toh(curr->status); 223232238Sluigi int len; 224227614Sluigi 225232238Sluigi if ((staterr & E1000_RXD_STAT_DD) == 0) 226232238Sluigi break; 227232238Sluigi len = le16toh(curr->length) - 4; // CRC 228232238Sluigi if (len < 0) { 229343771Svmaffione nm_prlim(2, "bogus pkt (%d) size %d nic idx %d", n, len, nic_i); 230232238Sluigi len = 0; 231232238Sluigi } 232259412Sluigi ring->slot[nm_i].len = len; 233341477Svmaffione ring->slot[nm_i].flags = 0; 234232238Sluigi bus_dmamap_sync(adapter->rxtag, 235259412Sluigi adapter->rx_buffer_area[nic_i].map, 236259412Sluigi BUS_DMASYNC_POSTREAD); 237259412Sluigi nm_i = nm_next(nm_i, lim); 238259412Sluigi nic_i = nm_next(nic_i, lim); 239227614Sluigi } 240232238Sluigi if (n) { /* update the state variables */ 241343771Svmaffione nm_prdis("%d new packets at nic %d nm %d tail %d", 242260368Sluigi n, 243260368Sluigi adapter->next_rx_desc_to_check, 244260368Sluigi netmap_idx_n2k(kring, adapter->next_rx_desc_to_check), 245260368Sluigi kring->nr_hwtail); 246259412Sluigi adapter->next_rx_desc_to_check = nic_i; 247271849Sglebius // if_inc_counter(ifp, IFCOUNTER_IPACKETS, n); 248260368Sluigi kring->nr_hwtail = nm_i; 249232238Sluigi } 250232238Sluigi kring->nr_kflags &= ~NKR_PENDINTR; 251227614Sluigi } 252227614Sluigi 253259412Sluigi /* 254259412Sluigi * Second part: skip past packets that userspace has released. 255259412Sluigi */ 256259412Sluigi nm_i = kring->nr_hwcur; 257260368Sluigi if (nm_i != head) { 258259412Sluigi nic_i = netmap_idx_k2n(kring, nm_i); 259260368Sluigi for (n = 0; nm_i != head; n++) { 260259412Sluigi struct netmap_slot *slot = &ring->slot[nm_i]; 261229939Sluigi uint64_t paddr; 262270063Sluigi void *addr = PNMB(na, slot, &paddr); 263227614Sluigi 264259412Sluigi struct e1000_rx_desc *curr = &adapter->rx_desc_base[nic_i]; 265259412Sluigi struct em_buffer *rxbuf = &adapter->rx_buffer_area[nic_i]; 266231778Sluigi 267270063Sluigi if (addr == NETMAP_BUF_BASE(na)) /* bad buf */ 268259412Sluigi goto ring_reset; 269259412Sluigi 270227614Sluigi if (slot->flags & NS_BUF_CHANGED) { 271231796Sluigi /* buffer has changed, reload map */ 272259412Sluigi curr->buffer_addr = htole64(paddr); 273270063Sluigi netmap_reload_map(na, adapter->rxtag, rxbuf->map, addr); 274227614Sluigi slot->flags &= ~NS_BUF_CHANGED; 275227614Sluigi } 276232238Sluigi curr->status = 0; 277227614Sluigi bus_dmamap_sync(adapter->rxtag, rxbuf->map, 278228276Sluigi BUS_DMASYNC_PREREAD); 279259412Sluigi nm_i = nm_next(nm_i, lim); 280259412Sluigi nic_i = nm_next(nic_i, lim); 281227614Sluigi } 282260368Sluigi kring->nr_hwcur = head; 283227614Sluigi bus_dmamap_sync(adapter->rxdma.dma_tag, adapter->rxdma.dma_map, 284228276Sluigi BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE); 285227614Sluigi /* 286227614Sluigi * IMPORTANT: we must leave one free slot in the ring, 287259412Sluigi * so move nic_i back by one unit 288227614Sluigi */ 289260368Sluigi nic_i = nm_prev(nic_i, lim); 290259412Sluigi E1000_WRITE_REG(&adapter->hw, E1000_RDT(0), nic_i); 291227614Sluigi } 292259412Sluigi 293227614Sluigi return 0; 294259412Sluigi 295259412Sluigiring_reset: 296259412Sluigi return netmap_ring_reinit(kring); 297227614Sluigi} 298232238Sluigi 299232238Sluigi 300232238Sluigistatic void 301232238Sluigilem_netmap_attach(struct adapter *adapter) 302232238Sluigi{ 303232238Sluigi struct netmap_adapter na; 304232238Sluigi 305232238Sluigi bzero(&na, sizeof(na)); 306232238Sluigi 307232238Sluigi na.ifp = adapter->ifp; 308257529Sluigi na.na_flags = NAF_BDG_MAYSLEEP; 309232238Sluigi na.num_tx_desc = adapter->num_tx_desc; 310232238Sluigi na.num_rx_desc = adapter->num_rx_desc; 311232238Sluigi na.nm_txsync = lem_netmap_txsync; 312232238Sluigi na.nm_rxsync = lem_netmap_rxsync; 313232238Sluigi na.nm_register = lem_netmap_reg; 314259412Sluigi na.num_tx_rings = na.num_rx_rings = 1; 315341477Svmaffione na.nm_intr = lem_netmap_intr; 316259412Sluigi netmap_attach(&na); 317232238Sluigi} 318232238Sluigi 319231198Sluigi/* end of file */ 320