2 * Copyright (C) 2011-2014 Universita` di Pisa. All rights reserved.
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5 * modification, are permitted provided that the following conditions
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13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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29 * Netmap support for igb, partly contributed by Ahmed Kooli
30 * For details on netmap support please see ixgbe_netmap.h
34 #include <net/netmap.h>
35 #include <sys/selinfo.h>
37 #include <vm/pmap.h> /* vtophys ? */
38 #include <dev/netmap/netmap_kern.h>
41 * Adaptation to different versions of the driver.
44 #ifndef IGB_MEDIA_RESET
45 /* at the same time as IGB_MEDIA_RESET was defined, the
46 * tx buffer descriptor was renamed, so use this to revert
47 * back to the old name.
49 #define igb_tx_buf igb_tx_buffer
54 * Register/unregister. We are already under netmap lock.
57 igb_netmap_reg(struct netmap_adapter *na, int onoff)
59 struct ifnet *ifp = na->ifp;
60 struct adapter *adapter = ifp->if_softc;
62 IGB_CORE_LOCK(adapter);
63 igb_disable_intr(adapter);
65 /* Tell the stack that the interface is no longer active */
66 ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | IFF_DRV_OACTIVE);
68 /* enable or disable flags and callbacks in na and ifp */
70 nm_set_native_flags(na);
72 nm_clear_native_flags(na);
74 igb_init_locked(adapter); /* also enable intr */
75 IGB_CORE_UNLOCK(adapter);
76 return (ifp->if_drv_flags & IFF_DRV_RUNNING ? 0 : 1);
81 * Reconcile kernel and user view of the transmit ring.
84 igb_netmap_txsync(struct netmap_kring *kring, int flags)
86 struct netmap_adapter *na = kring->na;
87 struct ifnet *ifp = na->ifp;
88 struct netmap_ring *ring = kring->ring;
89 u_int nm_i; /* index into the netmap ring */
90 u_int nic_i; /* index into the NIC ring */
92 u_int const lim = kring->nkr_num_slots - 1;
93 u_int const head = kring->rhead;
94 /* generate an interrupt approximately every half ring */
95 u_int report_frequency = kring->nkr_num_slots >> 1;
98 struct adapter *adapter = ifp->if_softc;
99 struct tx_ring *txr = &adapter->tx_rings[kring->ring_id];
100 /* 82575 needs the queue index added */
102 (adapter->hw.mac.type == e1000_82575) ? (txr->me << 4) : 0;
104 bus_dmamap_sync(txr->txdma.dma_tag, txr->txdma.dma_map,
105 BUS_DMASYNC_POSTREAD);
108 * First part: process new packets to send.
111 nm_i = kring->nr_hwcur;
112 if (nm_i != head) { /* we have new packets to send */
113 nic_i = netmap_idx_k2n(kring, nm_i);
114 for (n = 0; nm_i != head; n++) {
115 struct netmap_slot *slot = &ring->slot[nm_i];
116 u_int len = slot->len;
118 void *addr = PNMB(na, slot, &paddr);
120 /* device-specific */
121 union e1000_adv_tx_desc *curr =
122 (union e1000_adv_tx_desc *)&txr->tx_base[nic_i];
123 struct igb_tx_buf *txbuf = &txr->tx_buffers[nic_i];
124 int flags = (slot->flags & NS_REPORT ||
125 nic_i == 0 || nic_i == report_frequency) ?
126 E1000_ADVTXD_DCMD_RS : 0;
128 NM_CHECK_ADDR_LEN(na, addr, len);
130 if (slot->flags & NS_BUF_CHANGED) {
131 /* buffer has changed, reload map */
132 netmap_reload_map(na, txr->txtag, txbuf->map, addr);
134 slot->flags &= ~(NS_REPORT | NS_BUF_CHANGED);
136 /* Fill the slot in the NIC ring. */
137 curr->read.buffer_addr = htole64(paddr);
138 // XXX check olinfo and cmd_type_len
139 curr->read.olinfo_status =
140 htole32(olinfo_status |
141 (len<< E1000_ADVTXD_PAYLEN_SHIFT));
142 curr->read.cmd_type_len =
143 htole32(len | E1000_ADVTXD_DTYP_DATA |
144 E1000_ADVTXD_DCMD_IFCS |
145 E1000_ADVTXD_DCMD_DEXT |
146 E1000_ADVTXD_DCMD_EOP | flags);
148 /* make sure changes to the buffer are synced */
149 bus_dmamap_sync(txr->txtag, txbuf->map,
150 BUS_DMASYNC_PREWRITE);
152 nm_i = nm_next(nm_i, lim);
153 nic_i = nm_next(nic_i, lim);
155 kring->nr_hwcur = head;
157 /* Set the watchdog XXX ? */
158 txr->queue_status = IGB_QUEUE_WORKING;
159 txr->watchdog_time = ticks;
161 /* synchronize the NIC ring */
162 bus_dmamap_sync(txr->txdma.dma_tag, txr->txdma.dma_map,
163 BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
165 /* (re)start the tx unit up to slot nic_i (excluded) */
166 E1000_WRITE_REG(&adapter->hw, E1000_TDT(txr->me), nic_i);
170 * Second part: reclaim buffers for completed transmissions.
172 if (flags & NAF_FORCE_RECLAIM || nm_kr_txempty(kring)) {
173 /* record completed transmissions using TDH */
174 nic_i = E1000_READ_REG(&adapter->hw, E1000_TDH(kring->ring_id));
175 if (nic_i >= kring->nkr_num_slots) { /* XXX can it happen ? */
176 D("TDH wrap %d", nic_i);
177 nic_i -= kring->nkr_num_slots;
179 txr->next_to_clean = nic_i;
180 kring->nr_hwtail = nm_prev(netmap_idx_n2k(kring, nic_i), lim);
183 nm_txsync_finalize(kring);
190 * Reconcile kernel and user view of the receive ring.
193 igb_netmap_rxsync(struct netmap_kring *kring, int flags)
195 struct netmap_adapter *na = kring->na;
196 struct ifnet *ifp = na->ifp;
197 struct netmap_ring *ring = kring->ring;
198 u_int nm_i; /* index into the netmap ring */
199 u_int nic_i; /* index into the NIC ring */
201 u_int const lim = kring->nkr_num_slots - 1;
202 u_int const head = nm_rxsync_prologue(kring);
203 int force_update = (flags & NAF_FORCE_READ) || kring->nr_kflags & NKR_PENDINTR;
205 /* device-specific */
206 struct adapter *adapter = ifp->if_softc;
207 struct rx_ring *rxr = &adapter->rx_rings[kring->ring_id];
210 return netmap_ring_reinit(kring);
212 /* XXX check sync modes */
213 bus_dmamap_sync(rxr->rxdma.dma_tag, rxr->rxdma.dma_map,
214 BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
217 * First part: import newly received packets.
219 if (netmap_no_pendintr || force_update) {
220 uint16_t slot_flags = kring->nkr_slot_flags;
222 nic_i = rxr->next_to_check;
223 nm_i = netmap_idx_n2k(kring, nic_i);
226 union e1000_adv_rx_desc *curr = &rxr->rx_base[nic_i];
227 uint32_t staterr = le32toh(curr->wb.upper.status_error);
229 if ((staterr & E1000_RXD_STAT_DD) == 0)
231 ring->slot[nm_i].len = le16toh(curr->wb.upper.length);
232 ring->slot[nm_i].flags = slot_flags;
233 bus_dmamap_sync(rxr->ptag,
234 rxr->rx_buffers[nic_i].pmap, BUS_DMASYNC_POSTREAD);
235 nm_i = nm_next(nm_i, lim);
236 nic_i = nm_next(nic_i, lim);
238 if (n) { /* update the state variables */
239 rxr->next_to_check = nic_i;
240 kring->nr_hwtail = nm_i;
242 kring->nr_kflags &= ~NKR_PENDINTR;
246 * Second part: skip past packets that userspace has released.
248 nm_i = kring->nr_hwcur;
250 nic_i = netmap_idx_k2n(kring, nm_i);
251 for (n = 0; nm_i != head; n++) {
252 struct netmap_slot *slot = &ring->slot[nm_i];
254 void *addr = PNMB(na, slot, &paddr);
256 union e1000_adv_rx_desc *curr = &rxr->rx_base[nic_i];
257 struct igb_rx_buf *rxbuf = &rxr->rx_buffers[nic_i];
259 if (addr == NETMAP_BUF_BASE(na)) /* bad buf */
262 if (slot->flags & NS_BUF_CHANGED) {
263 /* buffer has changed, reload map */
264 netmap_reload_map(na, rxr->ptag, rxbuf->pmap, addr);
265 slot->flags &= ~NS_BUF_CHANGED;
267 curr->wb.upper.status_error = 0;
268 curr->read.pkt_addr = htole64(paddr);
269 bus_dmamap_sync(rxr->ptag, rxbuf->pmap,
270 BUS_DMASYNC_PREREAD);
271 nm_i = nm_next(nm_i, lim);
272 nic_i = nm_next(nic_i, lim);
274 kring->nr_hwcur = head;
276 bus_dmamap_sync(rxr->rxdma.dma_tag, rxr->rxdma.dma_map,
277 BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
279 * IMPORTANT: we must leave one free slot in the ring,
280 * so move nic_i back by one unit
282 nic_i = nm_prev(nic_i, lim);
283 E1000_WRITE_REG(&adapter->hw, E1000_RDT(rxr->me), nic_i);
286 /* tell userspace that there might be new packets */
287 nm_rxsync_finalize(kring);
292 return netmap_ring_reinit(kring);
297 igb_netmap_attach(struct adapter *adapter)
299 struct netmap_adapter na;
301 bzero(&na, sizeof(na));
303 na.ifp = adapter->ifp;
304 na.na_flags = NAF_BDG_MAYSLEEP;
305 na.num_tx_desc = adapter->num_tx_desc;
306 na.num_rx_desc = adapter->num_rx_desc;
307 na.nm_txsync = igb_netmap_txsync;
308 na.nm_rxsync = igb_netmap_rxsync;
309 na.nm_register = igb_netmap_reg;
310 na.num_tx_rings = na.num_rx_rings = adapter->num_queues;