1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (C) 2011-2014 Luigi Rizzo. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28 /*
29 *
30 * netmap support for: re
31 *
32 * For more details on netmap support please see ixgbe_netmap.h
33 */
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
43 /*
44 * Register/unregister. We are already under netmap lock.
45 */
46 static int
re_netmap_reg(struct netmap_adapter * na,int onoff)47 re_netmap_reg(struct netmap_adapter *na, int onoff)
48 {
49 if_t ifp = na->ifp;
50 struct rl_softc *adapter = if_getsoftc(ifp);
51
52 RL_LOCK(adapter);
53 re_stop(adapter); /* also clears IFF_DRV_RUNNING */
54 if (onoff) {
55 nm_set_native_flags(na);
56 } else {
57 nm_clear_native_flags(na);
58 }
59 re_init_locked(adapter); /* also enables intr */
60 RL_UNLOCK(adapter);
61 return (if_getdrvflags(ifp) & IFF_DRV_RUNNING ? 0 : 1);
62 }
63
64
65 /*
66 * Reconcile kernel and user view of the transmit ring.
67 */
68 static int
re_netmap_txsync(struct netmap_kring * kring,int flags)69 re_netmap_txsync(struct netmap_kring *kring, int flags)
70 {
71 struct netmap_adapter *na = kring->na;
72 if_t ifp = na->ifp;
73 struct netmap_ring *ring = kring->ring;
74 u_int nm_i; /* index into the netmap ring */
75 u_int nic_i; /* index into the NIC ring */
76 u_int n;
77 u_int const lim = kring->nkr_num_slots - 1;
78 u_int const head = kring->rhead;
79
80 /* device-specific */
81 struct rl_softc *sc = if_getsoftc(ifp);
82 struct rl_txdesc *txd = sc->rl_ldata.rl_tx_desc;
83
84 bus_dmamap_sync(sc->rl_ldata.rl_tx_list_tag,
85 sc->rl_ldata.rl_tx_list_map,
86 BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE); // XXX extra postwrite ?
87
88 /*
89 * First part: process new packets to send.
90 */
91 nm_i = kring->nr_hwcur;
92 if (nm_i != head) { /* we have new packets to send */
93 nic_i = sc->rl_ldata.rl_tx_prodidx;
94 // XXX or netmap_idx_k2n(kring, nm_i);
95
96 for (n = 0; nm_i != head; n++) {
97 struct netmap_slot *slot = &ring->slot[nm_i];
98 u_int len = slot->len;
99 uint64_t paddr;
100 void *addr = PNMB(na, slot, &paddr);
101
102 /* device-specific */
103 struct rl_desc *desc = &sc->rl_ldata.rl_tx_list[nic_i];
104 int cmd = slot->len | RL_TDESC_CMD_EOF |
105 RL_TDESC_CMD_OWN | RL_TDESC_CMD_SOF ;
106
107 NM_CHECK_ADDR_LEN(na, addr, len);
108
109 if (nic_i == lim) /* mark end of ring */
110 cmd |= RL_TDESC_CMD_EOR;
111
112 if (slot->flags & NS_BUF_CHANGED) {
113 /* buffer has changed, reload map */
114 desc->rl_bufaddr_lo = htole32(RL_ADDR_LO(paddr));
115 desc->rl_bufaddr_hi = htole32(RL_ADDR_HI(paddr));
116 netmap_reload_map(na, sc->rl_ldata.rl_tx_mtag,
117 txd[nic_i].tx_dmamap, addr);
118 }
119 slot->flags &= ~(NS_REPORT | NS_BUF_CHANGED);
120
121 /* Fill the slot in the NIC ring. */
122 desc->rl_cmdstat = htole32(cmd);
123
124 /* make sure changes to the buffer are synced */
125 bus_dmamap_sync(sc->rl_ldata.rl_tx_mtag,
126 txd[nic_i].tx_dmamap,
127 BUS_DMASYNC_PREWRITE);
128
129 nm_i = nm_next(nm_i, lim);
130 nic_i = nm_next(nic_i, lim);
131 }
132 sc->rl_ldata.rl_tx_prodidx = nic_i;
133 kring->nr_hwcur = head;
134
135 /* synchronize the NIC ring */
136 bus_dmamap_sync(sc->rl_ldata.rl_tx_list_tag,
137 sc->rl_ldata.rl_tx_list_map,
138 BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE);
139
140 /* start ? */
141 CSR_WRITE_1(sc, sc->rl_txstart, RL_TXSTART_START);
142 }
143
144 /*
145 * Second part: reclaim buffers for completed transmissions.
146 */
147 if (flags & NAF_FORCE_RECLAIM || nm_kr_txempty(kring)) {
148 nic_i = sc->rl_ldata.rl_tx_considx;
149 for (n = 0; nic_i != sc->rl_ldata.rl_tx_prodidx;
150 n++, nic_i = RL_TX_DESC_NXT(sc, nic_i)) {
151 uint32_t cmdstat =
152 le32toh(sc->rl_ldata.rl_tx_list[nic_i].rl_cmdstat);
153 if (cmdstat & RL_TDESC_STAT_OWN)
154 break;
155 }
156 if (n > 0) {
157 sc->rl_ldata.rl_tx_considx = nic_i;
158 sc->rl_ldata.rl_tx_free += n;
159 kring->nr_hwtail = nm_prev(netmap_idx_n2k(kring, nic_i), lim);
160 }
161 }
162
163 return 0;
164 }
165
166
167 /*
168 * Reconcile kernel and user view of the receive ring.
169 */
170 static int
re_netmap_rxsync(struct netmap_kring * kring,int flags)171 re_netmap_rxsync(struct netmap_kring *kring, int flags)
172 {
173 struct netmap_adapter *na = kring->na;
174 if_t ifp = na->ifp;
175 struct netmap_ring *ring = kring->ring;
176 u_int nm_i; /* index into the netmap ring */
177 u_int nic_i; /* index into the NIC ring */
178 u_int const lim = kring->nkr_num_slots - 1;
179 u_int const head = kring->rhead;
180 int force_update = (flags & NAF_FORCE_READ) || kring->nr_kflags & NKR_PENDINTR;
181
182 /* device-specific */
183 struct rl_softc *sc = if_getsoftc(ifp);
184 struct rl_rxdesc *rxd = sc->rl_ldata.rl_rx_desc;
185
186 if (head > lim)
187 return netmap_ring_reinit(kring);
188
189 bus_dmamap_sync(sc->rl_ldata.rl_rx_list_tag,
190 sc->rl_ldata.rl_rx_list_map,
191 BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
192
193 /*
194 * First part: import newly received packets.
195 *
196 * This device uses all the buffers in the ring, so we need
197 * another termination condition in addition to RL_RDESC_STAT_OWN
198 * cleared (all buffers could have it cleared). The easiest one
199 * is to stop right before nm_hwcur.
200 */
201 if (netmap_no_pendintr || force_update) {
202 uint32_t stop_i = nm_prev(kring->nr_hwcur, lim);
203
204 nic_i = sc->rl_ldata.rl_rx_prodidx; /* next pkt to check */
205 nm_i = netmap_idx_n2k(kring, nic_i);
206
207 while (nm_i != stop_i) {
208 struct rl_desc *cur_rx = &sc->rl_ldata.rl_rx_list[nic_i];
209 uint32_t rxstat = le32toh(cur_rx->rl_cmdstat);
210 uint32_t total_len;
211
212 if ((rxstat & RL_RDESC_STAT_OWN) != 0)
213 break;
214 total_len = rxstat & sc->rl_rxlenmask;
215 /* XXX subtract crc */
216 total_len = (total_len < 4) ? 0 : total_len - 4;
217 ring->slot[nm_i].len = total_len;
218 ring->slot[nm_i].flags = 0;
219 /* sync was in re_newbuf() */
220 bus_dmamap_sync(sc->rl_ldata.rl_rx_mtag,
221 rxd[nic_i].rx_dmamap, BUS_DMASYNC_POSTREAD);
222 // if_inc_counter(sc->rl_ifp, IFCOUNTER_IPACKETS, 1);
223 nm_i = nm_next(nm_i, lim);
224 nic_i = nm_next(nic_i, lim);
225 }
226 sc->rl_ldata.rl_rx_prodidx = nic_i;
227 kring->nr_hwtail = nm_i;
228 kring->nr_kflags &= ~NKR_PENDINTR;
229 }
230
231 /*
232 * Second part: skip past packets that userspace has released.
233 */
234 nm_i = kring->nr_hwcur;
235 if (nm_i != head) {
236 nic_i = netmap_idx_k2n(kring, nm_i);
237 while (nm_i != head) {
238 struct netmap_slot *slot = &ring->slot[nm_i];
239 uint64_t paddr;
240 void *addr = PNMB(na, slot, &paddr);
241
242 struct rl_desc *desc = &sc->rl_ldata.rl_rx_list[nic_i];
243 int cmd = NETMAP_BUF_SIZE(na) | RL_RDESC_CMD_OWN;
244
245 if (addr == NETMAP_BUF_BASE(na)) /* bad buf */
246 goto ring_reset;
247
248 if (nic_i == lim) /* mark end of ring */
249 cmd |= RL_RDESC_CMD_EOR;
250
251 if (slot->flags & NS_BUF_CHANGED) {
252 /* buffer has changed, reload map */
253 desc->rl_bufaddr_lo = htole32(RL_ADDR_LO(paddr));
254 desc->rl_bufaddr_hi = htole32(RL_ADDR_HI(paddr));
255 netmap_reload_map(na, sc->rl_ldata.rl_rx_mtag,
256 rxd[nic_i].rx_dmamap, addr);
257 slot->flags &= ~NS_BUF_CHANGED;
258 }
259 desc->rl_cmdstat = htole32(cmd);
260 bus_dmamap_sync(sc->rl_ldata.rl_rx_mtag,
261 rxd[nic_i].rx_dmamap,
262 BUS_DMASYNC_PREREAD);
263 nm_i = nm_next(nm_i, lim);
264 nic_i = nm_next(nic_i, lim);
265 }
266 kring->nr_hwcur = head;
267
268 bus_dmamap_sync(sc->rl_ldata.rl_rx_list_tag,
269 sc->rl_ldata.rl_rx_list_map,
270 BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
271 }
272
273 return 0;
274
275 ring_reset:
276 return netmap_ring_reinit(kring);
277 }
278
279
280 /*
281 * Additional routines to init the tx and rx rings.
282 * In other drivers we do that inline in the main code.
283 */
284 static void
re_netmap_tx_init(struct rl_softc * sc)285 re_netmap_tx_init(struct rl_softc *sc)
286 {
287 struct rl_txdesc *txd;
288 struct rl_desc *desc;
289 int i, n;
290 struct netmap_adapter *na = NA(sc->rl_ifp);
291 struct netmap_slot *slot;
292
293 slot = netmap_reset(na, NR_TX, 0, 0);
294 /* slot is NULL if we are not in native netmap mode */
295 if (!slot)
296 return;
297 /* in netmap mode, overwrite addresses and maps */
298 txd = sc->rl_ldata.rl_tx_desc;
299 desc = sc->rl_ldata.rl_tx_list;
300 n = sc->rl_ldata.rl_tx_desc_cnt;
301
302 /* l points in the netmap ring, i points in the NIC ring */
303 for (i = 0; i < n; i++) {
304 uint64_t paddr;
305 int l = netmap_idx_n2k(na->tx_rings[0], i);
306 void *addr = PNMB(na, slot + l, &paddr);
307
308 desc[i].rl_bufaddr_lo = htole32(RL_ADDR_LO(paddr));
309 desc[i].rl_bufaddr_hi = htole32(RL_ADDR_HI(paddr));
310 netmap_load_map(na, sc->rl_ldata.rl_tx_mtag,
311 txd[i].tx_dmamap, addr);
312 }
313 }
314
315 static void
re_netmap_rx_init(struct rl_softc * sc)316 re_netmap_rx_init(struct rl_softc *sc)
317 {
318 struct netmap_adapter *na = NA(sc->rl_ifp);
319 struct netmap_slot *slot = netmap_reset(na, NR_RX, 0, 0);
320 struct rl_desc *desc = sc->rl_ldata.rl_rx_list;
321 uint32_t cmdstat;
322 uint32_t nic_i, max_avail;
323 uint32_t const n = sc->rl_ldata.rl_rx_desc_cnt;
324
325 if (!slot)
326 return;
327 /*
328 * Do not release the slots owned by userspace,
329 * and also keep one empty.
330 */
331 max_avail = n - 1 - nm_kr_rxspace(na->rx_rings[0]);
332 for (nic_i = 0; nic_i < n; nic_i++) {
333 void *addr;
334 uint64_t paddr;
335 uint32_t nm_i = netmap_idx_n2k(na->rx_rings[0], nic_i);
336
337 addr = PNMB(na, slot + nm_i, &paddr);
338
339 netmap_reload_map(na, sc->rl_ldata.rl_rx_mtag,
340 sc->rl_ldata.rl_rx_desc[nic_i].rx_dmamap, addr);
341 bus_dmamap_sync(sc->rl_ldata.rl_rx_mtag,
342 sc->rl_ldata.rl_rx_desc[nic_i].rx_dmamap, BUS_DMASYNC_PREREAD);
343 desc[nic_i].rl_bufaddr_lo = htole32(RL_ADDR_LO(paddr));
344 desc[nic_i].rl_bufaddr_hi = htole32(RL_ADDR_HI(paddr));
345 cmdstat = NETMAP_BUF_SIZE(na);
346 if (nic_i == n - 1) /* mark the end of ring */
347 cmdstat |= RL_RDESC_CMD_EOR;
348 if (nic_i < max_avail)
349 cmdstat |= RL_RDESC_CMD_OWN;
350 desc[nic_i].rl_cmdstat = htole32(cmdstat);
351 }
352 }
353
354
355 static void
re_netmap_attach(struct rl_softc * sc)356 re_netmap_attach(struct rl_softc *sc)
357 {
358 struct netmap_adapter na;
359
360 bzero(&na, sizeof(na));
361
362 na.ifp = sc->rl_ifp;
363 na.na_flags = NAF_BDG_MAYSLEEP;
364 na.num_tx_desc = sc->rl_ldata.rl_tx_desc_cnt;
365 na.num_rx_desc = sc->rl_ldata.rl_rx_desc_cnt;
366 na.nm_txsync = re_netmap_txsync;
367 na.nm_rxsync = re_netmap_rxsync;
368 na.nm_register = re_netmap_reg;
369 na.num_tx_rings = na.num_rx_rings = 1;
370 netmap_attach(&na);
371 }
372
373 /* end of file */
374