1 /*
2 * Copyright (C) 2011 Matteo Landi, Luigi Rizzo. 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_em_netmap.h 231717 2012-02-14 22:49:34Z luigi $
28 * $Id: if_em_netmap.h 9802 2011-12-02 18:42:37Z luigi $
29 *
30 * netmap changes for if_em.
31 *
32 * For structure and details on the individual functions please see
33 * ixgbe_netmap.h
34 */
35
36 #include <net/netmap.h>
37 #include <sys/selinfo.h>
38 #include <vm/vm.h>
39 #include <vm/pmap.h> /* vtophys ? */
40 #include <dev/netmap/netmap_kern.h>
41
42 static void em_netmap_block_tasks(struct adapter *);
43 static void em_netmap_unblock_tasks(struct adapter *);
44 static int em_netmap_reg(struct ifnet *, int onoff);
45 static int em_netmap_txsync(struct ifnet *, u_int, int);
46 static int em_netmap_rxsync(struct ifnet *, u_int, int);
47 static void em_netmap_lock_wrapper(struct ifnet *, int, u_int);
48
49 static void
50 em_netmap_attach(struct adapter *adapter)
51 {
52 struct netmap_adapter na;
53
54 bzero(&na, sizeof(na));
55
56 na.ifp = adapter->ifp;
57 na.separate_locks = 1;
58 na.num_tx_desc = adapter->num_tx_desc;
59 na.num_rx_desc = adapter->num_rx_desc;
60 na.nm_txsync = em_netmap_txsync;
61 na.nm_rxsync = em_netmap_rxsync;
62 na.nm_lock = em_netmap_lock_wrapper;
63 na.nm_register = em_netmap_reg;
64 netmap_attach(&na, adapter->num_queues);
65 }
66
67
68 /*
69 * wrapper to export locks to the generic code
70 */
71 static void
72 em_netmap_lock_wrapper(struct ifnet *ifp, int what, u_int queueid)
73 {
74 struct adapter *adapter = ifp->if_softc;
75
76 ASSERT(queueid < adapter->num_queues);
77 switch (what) {
78 case NETMAP_CORE_LOCK:
79 EM_CORE_LOCK(adapter);
80 break;
81 case NETMAP_CORE_UNLOCK:
82 EM_CORE_UNLOCK(adapter);
83 break;
84 case NETMAP_TX_LOCK:
85 EM_TX_LOCK(&adapter->tx_rings[queueid]);
86 break;
87 case NETMAP_TX_UNLOCK:
88 EM_TX_UNLOCK(&adapter->tx_rings[queueid]);
89 break;
90 case NETMAP_RX_LOCK:
91 EM_RX_LOCK(&adapter->rx_rings[queueid]);
92 break;
93 case NETMAP_RX_UNLOCK:
94 EM_RX_UNLOCK(&adapter->rx_rings[queueid]);
95 break;
96 }
97 }
98
99
100 // XXX do we need to block/unblock the tasks ?
101 static void
102 em_netmap_block_tasks(struct adapter *adapter)
103 {
104 if (adapter->msix > 1) { /* MSIX */
105 int i;
106 struct tx_ring *txr = adapter->tx_rings;
107 struct rx_ring *rxr = adapter->rx_rings;
108
109 for (i = 0; i < adapter->num_queues; i++, txr++, rxr++) {
110 taskqueue_block(txr->tq);
111 taskqueue_drain(txr->tq, &txr->tx_task);
112 taskqueue_block(rxr->tq);
113 taskqueue_drain(rxr->tq, &rxr->rx_task);
114 }
115 } else { /* legacy */
116 taskqueue_block(adapter->tq);
117 taskqueue_drain(adapter->tq, &adapter->link_task);
118 taskqueue_drain(adapter->tq, &adapter->que_task);
119 }
120 }
121
122
123 static void
124 em_netmap_unblock_tasks(struct adapter *adapter)
125 {
126 if (adapter->msix > 1) {
127 struct tx_ring *txr = adapter->tx_rings;
128 struct rx_ring *rxr = adapter->rx_rings;
129 int i;
130
131 for (i = 0; i < adapter->num_queues; i++) {
132 taskqueue_unblock(txr->tq);
133 taskqueue_unblock(rxr->tq);
134 }
135 } else { /* legacy */
136 taskqueue_unblock(adapter->tq);
137 }
138 }
139
140 /*
141 * register-unregister routine
142 */
143 static int
144 em_netmap_reg(struct ifnet *ifp, int onoff)
145 {
146 struct adapter *adapter = ifp->if_softc;
147 struct netmap_adapter *na = NA(ifp);
148 int error = 0;
149
150 if (na == NULL)
151 return EINVAL; /* no netmap support here */
152
153 em_disable_intr(adapter);
154
155 /* Tell the stack that the interface is no longer active */
156 ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | IFF_DRV_OACTIVE);
157
158 em_netmap_block_tasks(adapter);
159
160 if (onoff) {
161 ifp->if_capenable |= IFCAP_NETMAP;
162
163 na->if_transmit = ifp->if_transmit;
164 ifp->if_transmit = netmap_start;
165
166 em_init_locked(adapter);
167 if ((ifp->if_drv_flags & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) == 0) {
168 error = ENOMEM;
169 goto fail;
170 }
171 } else {
172 fail:
173 /* restore if_transmit */
174 ifp->if_transmit = na->if_transmit;
175 ifp->if_capenable &= ~IFCAP_NETMAP;
176 em_init_locked(adapter); /* also enable intr */
177 }
178 em_netmap_unblock_tasks(adapter);
179 return (error);
180 }
181
182 /*
183 * Reconcile hardware and user view of the transmit ring.
184 */
185 static int
186 em_netmap_txsync(struct ifnet *ifp, u_int ring_nr, int do_lock)
187 {
188 struct adapter *adapter = ifp->if_softc;
189 struct tx_ring *txr = &adapter->tx_rings[ring_nr];
190 struct netmap_adapter *na = NA(adapter->ifp);
191 struct netmap_kring *kring = &na->tx_rings[ring_nr];
192 struct netmap_ring *ring = kring->ring;
193 int j, k, l, n = 0, lim = kring->nkr_num_slots - 1;
194
195 /* generate an interrupt approximately every half ring */
196 int report_frequency = kring->nkr_num_slots >> 1;
197
198 k = ring->cur;
199 if (k > lim)
200 return netmap_ring_reinit(kring);
201
202 if (do_lock)
203 EM_TX_LOCK(txr);
204 bus_dmamap_sync(txr->txdma.dma_tag, txr->txdma.dma_map,
205 BUS_DMASYNC_POSTREAD);
206
207 /* check for new packets to send.
208 * j indexes the netmap ring, l indexes the nic ring, and
209 * j = kring->nr_hwcur, l = E1000_TDT (not tracked),
210 * j == (l + kring->nkr_hwofs) % ring_size
211 */
212 j = kring->nr_hwcur;
213 if (j != k) { /* we have packets to send */
214 l = j - kring->nkr_hwofs;
215 if (l < 0)
216 l += lim + 1;
217 while (j != k) {
218 struct netmap_slot *slot = &ring->slot[j];
219 struct e1000_tx_desc *curr = &txr->tx_base[l];
220 struct em_buffer *txbuf = &txr->tx_buffers[l];
221 int flags = ((slot->flags & NS_REPORT) ||
222 j == 0 || j == report_frequency) ?
223 E1000_TXD_CMD_RS : 0;
224 uint64_t paddr;
225 void *addr = PNMB(slot, &paddr);
226 int len = slot->len;
227 if (addr == netmap_buffer_base || len > NETMAP_BUF_SIZE) {
228 if (do_lock)
229 EM_TX_UNLOCK(txr);
230 return netmap_ring_reinit(kring);
231 }
232
233 slot->flags &= ~NS_REPORT;
234 curr->upper.data = 0;
235 curr->lower.data =
236 htole32(adapter->txd_cmd | len |
237 (E1000_TXD_CMD_EOP | flags) );
238 if (slot->flags & NS_BUF_CHANGED) {
239 curr->buffer_addr = htole64(paddr);
240 /* buffer has changed, reload map */
241 netmap_reload_map(txr->txtag, txbuf->map, addr);
242 slot->flags &= ~NS_BUF_CHANGED;
243 }
244
245 bus_dmamap_sync(txr->txtag, txbuf->map,
246 BUS_DMASYNC_PREWRITE);
247 j = (j == lim) ? 0 : j + 1;
248 l = (l == lim) ? 0 : l + 1;
249 n++;
250 }
251 kring->nr_hwcur = k;
252
253 /* decrease avail by number of sent packets */
254 kring->nr_hwavail -= n;
255
256 bus_dmamap_sync(txr->txdma.dma_tag, txr->txdma.dma_map,
257 BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
258
259 E1000_WRITE_REG(&adapter->hw, E1000_TDT(txr->me), l);
260 }
261
262 if (n == 0 || kring->nr_hwavail < 1) {
263 int delta;
264
265 /* record completed transmissions using THD. */
266 l = E1000_READ_REG(&adapter->hw, E1000_TDH(ring_nr));
267 if (l >= kring->nkr_num_slots) { /* XXX can happen */
268 D("TDH wrap %d", l);
269 l -= kring->nkr_num_slots;
270 }
271 delta = l - txr->next_to_clean;
272 if (delta) {
273 /* some completed, increment hwavail. */
274 if (delta < 0)
275 delta += kring->nkr_num_slots;
276 txr->next_to_clean = l;
277 kring->nr_hwavail += delta;
278 }
279 }
280 /* update avail to what the hardware knows */
281 ring->avail = kring->nr_hwavail;
282
283 if (do_lock)
284 EM_TX_UNLOCK(txr);
285 return 0;
286 }
287
288 /*
289 * Reconcile kernel and user view of the receive ring.
290 */
291 static int
292 em_netmap_rxsync(struct ifnet *ifp, u_int ring_nr, int do_lock)
293 {
294 struct adapter *adapter = ifp->if_softc;
295 struct rx_ring *rxr = &adapter->rx_rings[ring_nr];
296 struct netmap_adapter *na = NA(adapter->ifp);
297 struct netmap_kring *kring = &na->rx_rings[ring_nr];
298 struct netmap_ring *ring = kring->ring;
299 int j, k, l, n, lim = kring->nkr_num_slots - 1;
300
301 k = ring->cur;
302 if (k > lim)
303 return netmap_ring_reinit(kring);
304
305 if (do_lock)
306 EM_RX_LOCK(rxr);
307 /* XXX check sync modes */
308 bus_dmamap_sync(rxr->rxdma.dma_tag, rxr->rxdma.dma_map,
309 BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
310
311 /* import newly received packets into the netmap ring.
312 * j is an index in the netmap ring, l in the NIC ring, and
313 * j = (kring->nr_hwcur + kring->nr_hwavail) % ring_size
314 * l = rxr->next_to_check;
315 * and
316 * j == (l + kring->nkr_hwofs) % ring_size
317 */
318 l = rxr->next_to_check;
319 j = l + kring->nkr_hwofs;
320 /* here nkr_hwofs can be negative so must check for j < 0 */
321 if (j < 0)
322 j += lim + 1;
323 else if (j > lim)
324 j -= lim + 1;
325 for (n = 0; ; n++) {
326 struct e1000_rx_desc *curr = &rxr->rx_base[l];
327
328 if ((curr->status & E1000_RXD_STAT_DD) == 0)
329 break;
330 ring->slot[j].len = le16toh(curr->length);
331 bus_dmamap_sync(rxr->rxtag, rxr->rx_buffers[l].map,
332 BUS_DMASYNC_POSTREAD);
333 j = (j == lim) ? 0 : j + 1;
334 /* make sure next_to_refresh follows next_to_check */
335 rxr->next_to_refresh = l; // XXX
336 l = (l == lim) ? 0 : l + 1;
337 }
338 if (n) {
339 rxr->next_to_check = l;
340 kring->nr_hwavail += n;
341 }
342
343 /* skip past packets that userspace has already processed */
344 j = kring->nr_hwcur;
345 if (j != k) { /* userspace has read some packets. */
346 n = 0;
347 l = j - kring->nkr_hwofs; /* NIC ring index */
348 /* here nkr_hwofs can be negative so check for l > lim */
349 if (l < 0)
350 l += lim + 1;
351 else if (l > lim)
352 l -= lim + 1;
353 while (j != k) {
354 struct netmap_slot *slot = &ring->slot[j];
355 struct e1000_rx_desc *curr = &rxr->rx_base[l];
356 struct em_buffer *rxbuf = &rxr->rx_buffers[l];
357 uint64_t paddr;
358 void *addr = PNMB(slot, &paddr);
359
360 if (addr == netmap_buffer_base) { /* bad buf */
361 if (do_lock)
362 EM_RX_UNLOCK(rxr);
363 return netmap_ring_reinit(kring);
364 }
365
366 curr->status = 0;
367 if (slot->flags & NS_BUF_CHANGED) {
368 curr->buffer_addr = htole64(paddr);
369 /* buffer has changed, reload map */
370 netmap_reload_map(rxr->rxtag, rxbuf->map, addr);
371 slot->flags &= ~NS_BUF_CHANGED;
372 }
373
374 bus_dmamap_sync(rxr->rxtag, rxbuf->map,
375 BUS_DMASYNC_PREREAD);
376
377 j = (j == lim) ? 0 : j + 1;
378 l = (l == lim) ? 0 : l + 1;
379 n++;
380 }
381 kring->nr_hwavail -= n;
382 kring->nr_hwcur = k;
383 bus_dmamap_sync(rxr->rxdma.dma_tag, rxr->rxdma.dma_map,
384 BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
385 /*
386 * IMPORTANT: we must leave one free slot in the ring,
387 * so move l back by one unit
388 */
389 l = (l == 0) ? lim : l - 1;
390 E1000_WRITE_REG(&adapter->hw, E1000_RDT(rxr->me), l);
391 }
392 /* tell userspace that there are new packets */
393 ring->avail = kring->nr_hwavail ;
394 if (do_lock)
395 EM_RX_UNLOCK(rxr);
396 return 0;
397 }
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