1 /*
2 * Copyright (C) 2011 Universita` di Pisa. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23 * SUCH DAMAGE.
24 */
25
26 /*
27 * $FreeBSD: releng/8.4/sys/dev/netmap/if_igb_netmap.h 231717 2012-02-14 22:49:34Z luigi $
28 * $Id: if_igb_netmap.h 9802 2011-12-02 18:42:37Z luigi $
29 *
30 * netmap modifications for igb
31 * contribured by Ahmed Kooli
32 */
33
34 #include <net/netmap.h>
35 #include <sys/selinfo.h>
36 #include <vm/vm.h>
37 #include <vm/pmap.h> /* vtophys ? */
38 #include <dev/netmap/netmap_kern.h>
39
40 static int igb_netmap_reg(struct ifnet *, int onoff);
41 static int igb_netmap_txsync(struct ifnet *, u_int, int);
42 static int igb_netmap_rxsync(struct ifnet *, u_int, int);
43 static void igb_netmap_lock_wrapper(struct ifnet *, int, u_int);
44
45
46 static void
47 igb_netmap_attach(struct adapter *adapter)
48 {
49 struct netmap_adapter na;
50
51 bzero(&na, sizeof(na));
52
53 na.ifp = adapter->ifp;
54 na.separate_locks = 1;
55 na.num_tx_desc = adapter->num_tx_desc;
56 na.num_rx_desc = adapter->num_rx_desc;
57 na.nm_txsync = igb_netmap_txsync;
58 na.nm_rxsync = igb_netmap_rxsync;
59 na.nm_lock = igb_netmap_lock_wrapper;
60 na.nm_register = igb_netmap_reg;
61 netmap_attach(&na, adapter->num_queues);
62 }
63
64
65 /*
66 * wrapper to export locks to the generic code
67 */
68 static void
69 igb_netmap_lock_wrapper(struct ifnet *ifp, int what, u_int queueid)
70 {
71 struct adapter *adapter = ifp->if_softc;
72
73 ASSERT(queueid < adapter->num_queues);
74 switch (what) {
75 case NETMAP_CORE_LOCK:
76 IGB_CORE_LOCK(adapter);
77 break;
78 case NETMAP_CORE_UNLOCK:
79 IGB_CORE_UNLOCK(adapter);
80 break;
81 case NETMAP_TX_LOCK:
82 IGB_TX_LOCK(&adapter->tx_rings[queueid]);
83 break;
84 case NETMAP_TX_UNLOCK:
85 IGB_TX_UNLOCK(&adapter->tx_rings[queueid]);
86 break;
87 case NETMAP_RX_LOCK:
88 IGB_RX_LOCK(&adapter->rx_rings[queueid]);
89 break;
90 case NETMAP_RX_UNLOCK:
91 IGB_RX_UNLOCK(&adapter->rx_rings[queueid]);
92 break;
93 }
94 }
95
96
97 /*
98 * support for netmap register/unregisted. We are already under core lock.
99 * only called on the first init or the last unregister.
100 */
101 static int
102 igb_netmap_reg(struct ifnet *ifp, int onoff)
103 {
104 struct adapter *adapter = ifp->if_softc;
105 struct netmap_adapter *na = NA(ifp);
106 int error = 0;
107
108 if (na == NULL)
109 return EINVAL;
110
111 igb_disable_intr(adapter);
112
113 /* Tell the stack that the interface is no longer active */
114 ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | IFF_DRV_OACTIVE);
115
116 if (onoff) {
117 ifp->if_capenable |= IFCAP_NETMAP;
118
119 /* save if_transmit to restore it later */
120 na->if_transmit = ifp->if_transmit;
121 ifp->if_transmit = netmap_start;
122
123 igb_init_locked(adapter);
124 if ((ifp->if_drv_flags & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) == 0) {
125 error = ENOMEM;
126 goto fail;
127 }
128 } else {
129 fail:
130 /* restore if_transmit */
131 ifp->if_transmit = na->if_transmit;
132 ifp->if_capenable &= ~IFCAP_NETMAP;
133 igb_init_locked(adapter); /* also enables intr */
134 }
135 return (error);
136 }
137
138
139 /*
140 * Reconcile kernel and user view of the transmit ring.
141 */
142 static int
143 igb_netmap_txsync(struct ifnet *ifp, u_int ring_nr, int do_lock)
144 {
145 struct adapter *adapter = ifp->if_softc;
146 struct tx_ring *txr = &adapter->tx_rings[ring_nr];
147 struct netmap_adapter *na = NA(adapter->ifp);
148 struct netmap_kring *kring = &na->tx_rings[ring_nr];
149 struct netmap_ring *ring = kring->ring;
150 int j, k, l, n = 0, lim = kring->nkr_num_slots - 1;
151
152 /* generate an interrupt approximately every half ring */
153 int report_frequency = kring->nkr_num_slots >> 1;
154
155 k = ring->cur;
156 if (k > lim)
157 return netmap_ring_reinit(kring);
158
159 if (do_lock)
160 IGB_TX_LOCK(txr);
161 bus_dmamap_sync(txr->txdma.dma_tag, txr->txdma.dma_map,
162 BUS_DMASYNC_POSTREAD);
163
164 /* update avail to what the hardware knows */
165 ring->avail = kring->nr_hwavail;
166
167 j = kring->nr_hwcur; /* netmap ring index */
168 if (j != k) { /* we have new packets to send */
169 u32 olinfo_status = 0;
170
171 l = j - kring->nkr_hwofs; /* NIC ring index */
172 if (l < 0)
173 l += lim + 1;
174 /* 82575 needs the queue index added */
175 if (adapter->hw.mac.type == e1000_82575)
176 olinfo_status |= txr->me << 4;
177
178 while (j != k) {
179 struct netmap_slot *slot = &ring->slot[j];
180 struct igb_tx_buffer *txbuf = &txr->tx_buffers[l];
181 union e1000_adv_tx_desc *curr =
182 (union e1000_adv_tx_desc *)&txr->tx_base[l];
183 uint64_t paddr;
184 void *addr = PNMB(slot, &paddr);
185 int flags = ((slot->flags & NS_REPORT) ||
186 j == 0 || j == report_frequency) ?
187 E1000_ADVTXD_DCMD_RS : 0;
188 int len = slot->len;
189
190 if (addr == netmap_buffer_base || len > NETMAP_BUF_SIZE) {
191 if (do_lock)
192 IGB_TX_UNLOCK(txr);
193 return netmap_ring_reinit(kring);
194 }
195
196 slot->flags &= ~NS_REPORT;
197 // XXX do we need to set the address ?
198 curr->read.buffer_addr = htole64(paddr);
199 curr->read.olinfo_status =
200 htole32(olinfo_status |
201 (len<< E1000_ADVTXD_PAYLEN_SHIFT));
202 curr->read.cmd_type_len =
203 htole32(len | E1000_ADVTXD_DTYP_DATA |
204 E1000_ADVTXD_DCMD_IFCS |
205 E1000_ADVTXD_DCMD_DEXT |
206 E1000_ADVTXD_DCMD_EOP | flags);
207 if (slot->flags & NS_BUF_CHANGED) {
208 /* buffer has changed, reload map */
209 netmap_reload_map(txr->txtag, txbuf->map, addr);
210 slot->flags &= ~NS_BUF_CHANGED;
211 }
212
213 bus_dmamap_sync(txr->txtag, txbuf->map,
214 BUS_DMASYNC_PREWRITE);
215 j = (j == lim) ? 0 : j + 1;
216 l = (l == lim) ? 0 : l + 1;
217 n++;
218 }
219 kring->nr_hwcur = k;
220
221 /* decrease avail by number of sent packets */
222 kring->nr_hwavail -= n;
223 ring->avail = kring->nr_hwavail;
224
225 /* Set the watchdog XXX ? */
226 txr->queue_status = IGB_QUEUE_WORKING;
227 txr->watchdog_time = ticks;
228
229 bus_dmamap_sync(txr->txdma.dma_tag, txr->txdma.dma_map,
230 BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
231
232 E1000_WRITE_REG(&adapter->hw, E1000_TDT(txr->me), l);
233 }
234 if (n == 0 || kring->nr_hwavail < 1) {
235 int delta;
236
237 /* record completed transmission using TDH */
238 l = E1000_READ_REG(&adapter->hw, E1000_TDH(ring_nr));
239 if (l >= kring->nkr_num_slots) /* XXX can it happen ? */
240 l -= kring->nkr_num_slots;
241 delta = l - txr->next_to_clean;
242 if (delta) {
243 /* new tx were completed */
244 if (delta < 0)
245 delta += kring->nkr_num_slots;
246 txr->next_to_clean = l;
247 kring->nr_hwavail += delta;
248 ring->avail = kring->nr_hwavail;
249 }
250 }
251 if (do_lock)
252 IGB_TX_UNLOCK(txr);
253 return 0;
254 }
255
256
257 /*
258 * Reconcile kernel and user view of the receive ring.
259 */
260 static int
261 igb_netmap_rxsync(struct ifnet *ifp, u_int ring_nr, int do_lock)
262 {
263 struct adapter *adapter = ifp->if_softc;
264 struct rx_ring *rxr = &adapter->rx_rings[ring_nr];
265 struct netmap_adapter *na = NA(adapter->ifp);
266 struct netmap_kring *kring = &na->rx_rings[ring_nr];
267 struct netmap_ring *ring = kring->ring;
268 int j, k, l, n, lim = kring->nkr_num_slots - 1;
269
270 k = ring->cur;
271 if (k > lim)
272 return netmap_ring_reinit(kring);
273
274 if (do_lock)
275 IGB_RX_LOCK(rxr);
276
277 /* Sync the ring. */
278 bus_dmamap_sync(rxr->rxdma.dma_tag, rxr->rxdma.dma_map,
279 BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
280
281 l = rxr->next_to_check;
282 j = l + kring->nkr_hwofs;
283 if (j > lim)
284 j -= lim + 1;
285 for (n = 0; ; n++) {
286 union e1000_adv_rx_desc *curr = &rxr->rx_base[l];
287 uint32_t staterr = le32toh(curr->wb.upper.status_error);
288
289 if ((staterr & E1000_RXD_STAT_DD) == 0)
290 break;
291 ring->slot[j].len = le16toh(curr->wb.upper.length);
292
293 bus_dmamap_sync(rxr->ptag,
294 rxr->rx_buffers[l].pmap, BUS_DMASYNC_POSTREAD);
295 j = (j == lim) ? 0 : j + 1;
296 l = (l == lim) ? 0 : l + 1;
297 }
298 if (n) {
299 rxr->next_to_check = l;
300 kring->nr_hwavail += n;
301 }
302
303 /* skip past packets that userspace has already processed,
304 * making them available for reception.
305 * advance nr_hwcur and issue a bus_dmamap_sync on the
306 * buffers so it is safe to write to them.
307 * Also increase nr_hwavail
308 */
309 j = kring->nr_hwcur;
310 l = kring->nr_hwcur - kring->nkr_hwofs;
311 if (l < 0)
312 l += lim + 1;
313 if (j != k) { /* userspace has read some packets. */
314 n = 0;
315 while (j != k) {
316 struct netmap_slot *slot = ring->slot + j;
317 union e1000_adv_rx_desc *curr = &rxr->rx_base[l];
318 struct igb_rx_buf *rxbuf = rxr->rx_buffers + l;
319 uint64_t paddr;
320 void *addr = PNMB(slot, &paddr);
321
322 if (addr == netmap_buffer_base) { /* bad buf */
323 if (do_lock)
324 IGB_RX_UNLOCK(rxr);
325 return netmap_ring_reinit(kring);
326 }
327
328 curr->wb.upper.status_error = 0;
329 curr->read.pkt_addr = htole64(paddr);
330 if (slot->flags & NS_BUF_CHANGED) {
331 netmap_reload_map(rxr->ptag, rxbuf->pmap, addr);
332 slot->flags &= ~NS_BUF_CHANGED;
333 }
334
335 bus_dmamap_sync(rxr->ptag, rxbuf->pmap,
336 BUS_DMASYNC_PREREAD);
337
338 j = (j == lim) ? 0 : j + 1;
339 l = (l == lim) ? 0 : l + 1;
340 n++;
341 }
342 kring->nr_hwavail -= n;
343 kring->nr_hwcur = ring->cur;
344 bus_dmamap_sync(rxr->rxdma.dma_tag, rxr->rxdma.dma_map,
345 BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
346 /* IMPORTANT: we must leave one free slot in the ring,
347 * so move l back by one unit
348 */
349 l = (l == 0) ? lim : l - 1;
350 E1000_WRITE_REG(&adapter->hw, E1000_RDT(rxr->me), l);
351 }
352 /* tell userspace that there are new packets */
353 ring->avail = kring->nr_hwavail ;
354 if (do_lock)
355 IGB_RX_UNLOCK(rxr);
356 return 0;
357 }
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