1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
|
/*
* Copyright (C) 2011 Luigi Rizzo. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* $FreeBSD$
* $Id: if_re_netmap.h 10609 2012-02-22 19:44:58Z luigi $
*
* netmap support for "re"
* For details on netmap support please see ixgbe_netmap.h
*/
#include <net/netmap.h>
#include <sys/selinfo.h>
#include <vm/vm.h>
#include <vm/pmap.h> /* vtophys ? */
#include <dev/netmap/netmap_kern.h>
/*
* wrapper to export locks to the generic code
* We should not use the tx/rx locks
*/
static void
re_netmap_lock_wrapper(struct ifnet *ifp, int what, u_int queueid)
{
struct rl_softc *adapter = ifp->if_softc;
switch (what) {
case NETMAP_CORE_LOCK:
RL_LOCK(adapter);
break;
case NETMAP_CORE_UNLOCK:
RL_UNLOCK(adapter);
break;
case NETMAP_TX_LOCK:
case NETMAP_RX_LOCK:
case NETMAP_TX_UNLOCK:
case NETMAP_RX_UNLOCK:
D("invalid lock call %d, no tx/rx locks here", what);
break;
}
}
/*
* support for netmap register/unregisted. We are already under core lock.
* only called on the first register or the last unregister.
*/
static int
re_netmap_reg(struct ifnet *ifp, int onoff)
{
struct rl_softc *adapter = ifp->if_softc;
struct netmap_adapter *na = NA(ifp);
int error = 0;
if (na == NULL)
return EINVAL;
/* Tell the stack that the interface is no longer active */
ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | IFF_DRV_OACTIVE);
re_stop(adapter);
if (onoff) {
ifp->if_capenable |= IFCAP_NETMAP;
/* save if_transmit to restore it later */
na->if_transmit = ifp->if_transmit;
ifp->if_transmit = netmap_start;
re_init_locked(adapter);
if ((ifp->if_drv_flags & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) == 0) {
error = ENOMEM;
goto fail;
}
} else {
fail:
/* restore if_transmit */
ifp->if_transmit = na->if_transmit;
ifp->if_capenable &= ~IFCAP_NETMAP;
re_init_locked(adapter); /* also enables intr */
}
return (error);
}
/*
* Reconcile kernel and user view of the transmit ring.
*/
static int
re_netmap_txsync(struct ifnet *ifp, u_int ring_nr, int do_lock)
{
struct rl_softc *sc = ifp->if_softc;
struct rl_txdesc *txd = sc->rl_ldata.rl_tx_desc;
struct netmap_adapter *na = NA(sc->rl_ifp);
struct netmap_kring *kring = &na->tx_rings[ring_nr];
struct netmap_ring *ring = kring->ring;
int j, k, l, n, lim = kring->nkr_num_slots - 1;
k = ring->cur;
if (k > lim)
return netmap_ring_reinit(kring);
if (do_lock)
RL_LOCK(sc);
/* Sync the TX descriptor list */
bus_dmamap_sync(sc->rl_ldata.rl_tx_list_tag,
sc->rl_ldata.rl_tx_list_map,
BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
/* XXX move after the transmissions */
/* record completed transmissions */
for (n = 0, l = sc->rl_ldata.rl_tx_considx;
l != sc->rl_ldata.rl_tx_prodidx;
n++, l = RL_TX_DESC_NXT(sc, l)) {
uint32_t cmdstat =
le32toh(sc->rl_ldata.rl_tx_list[l].rl_cmdstat);
if (cmdstat & RL_TDESC_STAT_OWN)
break;
}
if (n > 0) {
sc->rl_ldata.rl_tx_considx = l;
sc->rl_ldata.rl_tx_free += n;
kring->nr_hwavail += n;
}
/* update avail to what the kernel knows */
ring->avail = kring->nr_hwavail;
j = kring->nr_hwcur;
if (j != k) { /* we have new packets to send */
l = sc->rl_ldata.rl_tx_prodidx;
for (n = 0; j != k; n++) {
struct netmap_slot *slot = &ring->slot[j];
struct rl_desc *desc = &sc->rl_ldata.rl_tx_list[l];
int cmd = slot->len | RL_TDESC_CMD_EOF |
RL_TDESC_CMD_OWN | RL_TDESC_CMD_SOF ;
uint64_t paddr;
void *addr = PNMB(slot, &paddr);
int len = slot->len;
if (addr == netmap_buffer_base || len > NETMAP_BUF_SIZE) {
if (do_lock)
RL_UNLOCK(sc);
// XXX what about prodidx ?
return netmap_ring_reinit(kring);
}
if (l == lim) /* mark end of ring */
cmd |= RL_TDESC_CMD_EOR;
if (slot->flags & NS_BUF_CHANGED) {
desc->rl_bufaddr_lo = htole32(RL_ADDR_LO(paddr));
desc->rl_bufaddr_hi = htole32(RL_ADDR_HI(paddr));
/* buffer has changed, unload and reload map */
netmap_reload_map(sc->rl_ldata.rl_tx_mtag,
txd[l].tx_dmamap, addr);
slot->flags &= ~NS_BUF_CHANGED;
}
slot->flags &= ~NS_REPORT;
desc->rl_cmdstat = htole32(cmd);
bus_dmamap_sync(sc->rl_ldata.rl_tx_mtag,
txd[l].tx_dmamap, BUS_DMASYNC_PREWRITE);
j = (j == lim) ? 0 : j + 1;
l = (l == lim) ? 0 : l + 1;
}
sc->rl_ldata.rl_tx_prodidx = l;
kring->nr_hwcur = k; /* the saved ring->cur */
ring->avail -= n; // XXX see others
kring->nr_hwavail = ring->avail;
bus_dmamap_sync(sc->rl_ldata.rl_tx_list_tag,
sc->rl_ldata.rl_tx_list_map,
BUS_DMASYNC_PREWRITE|BUS_DMASYNC_PREREAD);
/* start ? */
CSR_WRITE_1(sc, sc->rl_txstart, RL_TXSTART_START);
}
if (do_lock)
RL_UNLOCK(sc);
return 0;
}
/*
* Reconcile kernel and user view of the receive ring.
*/
static int
re_netmap_rxsync(struct ifnet *ifp, u_int ring_nr, int do_lock)
{
struct rl_softc *sc = ifp->if_softc;
struct rl_rxdesc *rxd = sc->rl_ldata.rl_rx_desc;
struct netmap_adapter *na = NA(sc->rl_ifp);
struct netmap_kring *kring = &na->rx_rings[ring_nr];
struct netmap_ring *ring = kring->ring;
int j, l, n, lim = kring->nkr_num_slots - 1;
int force_update = do_lock || kring->nr_kflags & NKR_PENDINTR;
u_int k = ring->cur, resvd = ring->reserved;
k = ring->cur;
if (k > lim)
return netmap_ring_reinit(kring);
if (do_lock)
RL_LOCK(sc);
/* XXX check sync modes */
bus_dmamap_sync(sc->rl_ldata.rl_rx_list_tag,
sc->rl_ldata.rl_rx_list_map,
BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
/*
* Import newly received packets into the netmap ring.
* j is an index in the netmap ring, l in the NIC ring.
*
* The device uses all the buffers in the ring, so we need
* another termination condition in addition to RL_RDESC_STAT_OWN
* cleared (all buffers could have it cleared. The easiest one
* is to limit the amount of data reported up to 'lim'
*/
l = sc->rl_ldata.rl_rx_prodidx; /* next pkt to check */
j = netmap_idx_n2k(kring, l); /* the kring index */
if (netmap_no_pendintr || force_update) {
for (n = kring->nr_hwavail; n < lim ; n++) {
struct rl_desc *cur_rx = &sc->rl_ldata.rl_rx_list[l];
uint32_t rxstat = le32toh(cur_rx->rl_cmdstat);
uint32_t total_len;
if ((rxstat & RL_RDESC_STAT_OWN) != 0)
break;
total_len = rxstat & sc->rl_rxlenmask;
/* XXX subtract crc */
total_len = (total_len < 4) ? 0 : total_len - 4;
kring->ring->slot[j].len = total_len;
/* sync was in re_newbuf() */
bus_dmamap_sync(sc->rl_ldata.rl_rx_mtag,
rxd[l].rx_dmamap, BUS_DMASYNC_POSTREAD);
j = (j == lim) ? 0 : j + 1;
l = (l == lim) ? 0 : l + 1;
}
if (n != kring->nr_hwavail) {
sc->rl_ldata.rl_rx_prodidx = l;
sc->rl_ifp->if_ipackets += n - kring->nr_hwavail;
kring->nr_hwavail = n;
}
kring->nr_kflags &= ~NKR_PENDINTR;
}
/* skip past packets that userspace has released */
j = kring->nr_hwcur;
if (resvd > 0) {
if (resvd + ring->avail >= lim + 1) {
D("XXX invalid reserve/avail %d %d", resvd, ring->avail);
ring->reserved = resvd = 0; // XXX panic...
}
k = (k >= resvd) ? k - resvd : k + lim + 1 - resvd;
}
if (j != k) { /* userspace has released some packets. */
l = netmap_idx_k2n(kring, j); /* the NIC index */
for (n = 0; j != k; n++) {
struct netmap_slot *slot = ring->slot + j;
struct rl_desc *desc = &sc->rl_ldata.rl_rx_list[l];
int cmd = NETMAP_BUF_SIZE | RL_RDESC_CMD_OWN;
uint64_t paddr;
void *addr = PNMB(slot, &paddr);
if (addr == netmap_buffer_base) { /* bad buf */
if (do_lock)
RL_UNLOCK(sc);
return netmap_ring_reinit(kring);
}
if (l == lim) /* mark end of ring */
cmd |= RL_RDESC_CMD_EOR;
slot->flags &= ~NS_REPORT;
if (slot->flags & NS_BUF_CHANGED) {
netmap_reload_map(sc->rl_ldata.rl_rx_mtag,
rxd[l].rx_dmamap, addr);
desc->rl_bufaddr_lo = htole32(RL_ADDR_LO(paddr));
desc->rl_bufaddr_hi = htole32(RL_ADDR_HI(paddr));
slot->flags &= ~NS_BUF_CHANGED;
}
desc->rl_cmdstat = htole32(cmd);
bus_dmamap_sync(sc->rl_ldata.rl_rx_mtag,
rxd[l].rx_dmamap, BUS_DMASYNC_PREREAD);
j = (j == lim) ? 0 : j + 1;
l = (l == lim) ? 0 : l + 1;
}
kring->nr_hwavail -= n;
kring->nr_hwcur = k;
/* Flush the RX DMA ring */
bus_dmamap_sync(sc->rl_ldata.rl_rx_list_tag,
sc->rl_ldata.rl_rx_list_map,
BUS_DMASYNC_PREWRITE|BUS_DMASYNC_PREREAD);
}
/* tell userspace that there are new packets */
ring->avail = kring->nr_hwavail - resvd;
if (do_lock)
RL_UNLOCK(sc);
return 0;
}
/*
* Additional routines to init the tx and rx rings.
* In other drivers we do that inline in the main code.
*/
static void
re_netmap_tx_init(struct rl_softc *sc)
{
struct rl_txdesc *txd;
struct rl_desc *desc;
int i, n;
struct netmap_adapter *na = NA(sc->rl_ifp);
struct netmap_slot *slot = netmap_reset(na, NR_TX, 0, 0);
/* slot is NULL if we are not in netmap mode */
if (!slot)
return;
/* in netmap mode, overwrite addresses and maps */
txd = sc->rl_ldata.rl_tx_desc;
desc = sc->rl_ldata.rl_tx_list;
n = sc->rl_ldata.rl_tx_desc_cnt;
/* l points in the netmap ring, i points in the NIC ring */
for (i = 0; i < n; i++) {
uint64_t paddr;
int l = netmap_idx_n2k(&na->tx_rings[0], i);
void *addr = PNMB(slot + l, &paddr);
desc[i].rl_bufaddr_lo = htole32(RL_ADDR_LO(paddr));
desc[i].rl_bufaddr_hi = htole32(RL_ADDR_HI(paddr));
netmap_load_map(sc->rl_ldata.rl_tx_mtag,
txd[i].tx_dmamap, addr);
}
}
static void
re_netmap_rx_init(struct rl_softc *sc)
{
struct netmap_adapter *na = NA(sc->rl_ifp);
struct netmap_slot *slot = netmap_reset(na, NR_RX, 0, 0);
struct rl_desc *desc = sc->rl_ldata.rl_rx_list;
uint32_t cmdstat;
int i, n, max_avail;
if (!slot)
return;
n = sc->rl_ldata.rl_rx_desc_cnt;
/*
* Userspace owned hwavail packets before the reset,
* so the NIC that last hwavail descriptors of the ring
* are still owned by the driver (and keep one empty).
*/
max_avail = n - 1 - na->rx_rings[0].nr_hwavail;
for (i = 0; i < n; i++) {
void *addr;
uint64_t paddr;
int l = netmap_idx_n2k(&na->rx_rings[0], i);
addr = PNMB(slot + l, &paddr);
netmap_reload_map(sc->rl_ldata.rl_rx_mtag,
sc->rl_ldata.rl_rx_desc[i].rx_dmamap, addr);
bus_dmamap_sync(sc->rl_ldata.rl_rx_mtag,
sc->rl_ldata.rl_rx_desc[i].rx_dmamap, BUS_DMASYNC_PREREAD);
desc[i].rl_bufaddr_lo = htole32(RL_ADDR_LO(paddr));
desc[i].rl_bufaddr_hi = htole32(RL_ADDR_HI(paddr));
cmdstat = NETMAP_BUF_SIZE;
if (i == n - 1) /* mark the end of ring */
cmdstat |= RL_RDESC_CMD_EOR;
if (i < max_avail)
cmdstat |= RL_RDESC_CMD_OWN;
desc[i].rl_cmdstat = htole32(cmdstat);
}
}
static void
re_netmap_attach(struct rl_softc *sc)
{
struct netmap_adapter na;
bzero(&na, sizeof(na));
na.ifp = sc->rl_ifp;
na.separate_locks = 0;
na.num_tx_desc = sc->rl_ldata.rl_tx_desc_cnt;
na.num_rx_desc = sc->rl_ldata.rl_rx_desc_cnt;
na.nm_txsync = re_netmap_txsync;
na.nm_rxsync = re_netmap_rxsync;
na.nm_lock = re_netmap_lock_wrapper;
na.nm_register = re_netmap_reg;
netmap_attach(&na, 1);
}
/* end of file */
|