2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (C) 2011-2014 Luigi Rizzo. All rights reserved.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
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11 * 2. Redistributions in binary form must reproduce the above copyright
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18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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31 * netmap support for: re
33 * For more details on netmap support please see ixgbe_netmap.h
37 #include <net/netmap.h>
38 #include <sys/selinfo.h>
40 #include <vm/pmap.h> /* vtophys ? */
41 #include <dev/netmap/netmap_kern.h>
45 * Register/unregister. We are already under netmap lock.
48 re_netmap_reg(struct netmap_adapter *na, int onoff)
50 struct ifnet *ifp = na->ifp;
51 struct rl_softc *adapter = ifp->if_softc;
54 re_stop(adapter); /* also clears IFF_DRV_RUNNING */
56 nm_set_native_flags(na);
58 nm_clear_native_flags(na);
60 re_init_locked(adapter); /* also enables intr */
62 return (ifp->if_drv_flags & IFF_DRV_RUNNING ? 0 : 1);
67 * Reconcile kernel and user view of the transmit ring.
70 re_netmap_txsync(struct netmap_kring *kring, int flags)
72 struct netmap_adapter *na = kring->na;
73 struct ifnet *ifp = na->ifp;
74 struct netmap_ring *ring = kring->ring;
75 u_int nm_i; /* index into the netmap ring */
76 u_int nic_i; /* index into the NIC ring */
78 u_int const lim = kring->nkr_num_slots - 1;
79 u_int const head = kring->rhead;
82 struct rl_softc *sc = ifp->if_softc;
83 struct rl_txdesc *txd = sc->rl_ldata.rl_tx_desc;
85 bus_dmamap_sync(sc->rl_ldata.rl_tx_list_tag,
86 sc->rl_ldata.rl_tx_list_map,
87 BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE); // XXX extra postwrite ?
90 * First part: process new packets to send.
92 nm_i = kring->nr_hwcur;
93 if (nm_i != head) { /* we have new packets to send */
94 nic_i = sc->rl_ldata.rl_tx_prodidx;
95 // XXX or netmap_idx_k2n(kring, nm_i);
97 for (n = 0; nm_i != head; n++) {
98 struct netmap_slot *slot = &ring->slot[nm_i];
99 u_int len = slot->len;
101 void *addr = PNMB(na, slot, &paddr);
103 /* device-specific */
104 struct rl_desc *desc = &sc->rl_ldata.rl_tx_list[nic_i];
105 int cmd = slot->len | RL_TDESC_CMD_EOF |
106 RL_TDESC_CMD_OWN | RL_TDESC_CMD_SOF ;
108 NM_CHECK_ADDR_LEN(na, addr, len);
110 if (nic_i == lim) /* mark end of ring */
111 cmd |= RL_TDESC_CMD_EOR;
113 if (slot->flags & NS_BUF_CHANGED) {
114 /* buffer has changed, reload map */
115 desc->rl_bufaddr_lo = htole32(RL_ADDR_LO(paddr));
116 desc->rl_bufaddr_hi = htole32(RL_ADDR_HI(paddr));
117 netmap_reload_map(na, sc->rl_ldata.rl_tx_mtag,
118 txd[nic_i].tx_dmamap, addr);
120 slot->flags &= ~(NS_REPORT | NS_BUF_CHANGED);
122 /* Fill the slot in the NIC ring. */
123 desc->rl_cmdstat = htole32(cmd);
125 /* make sure changes to the buffer are synced */
126 bus_dmamap_sync(sc->rl_ldata.rl_tx_mtag,
127 txd[nic_i].tx_dmamap,
128 BUS_DMASYNC_PREWRITE);
130 nm_i = nm_next(nm_i, lim);
131 nic_i = nm_next(nic_i, lim);
133 sc->rl_ldata.rl_tx_prodidx = nic_i;
134 kring->nr_hwcur = head;
136 /* synchronize the NIC ring */
137 bus_dmamap_sync(sc->rl_ldata.rl_tx_list_tag,
138 sc->rl_ldata.rl_tx_list_map,
139 BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE);
142 CSR_WRITE_1(sc, sc->rl_txstart, RL_TXSTART_START);
146 * Second part: reclaim buffers for completed transmissions.
148 if (flags & NAF_FORCE_RECLAIM || nm_kr_txempty(kring)) {
149 nic_i = sc->rl_ldata.rl_tx_considx;
150 for (n = 0; nic_i != sc->rl_ldata.rl_tx_prodidx;
151 n++, nic_i = RL_TX_DESC_NXT(sc, nic_i)) {
153 le32toh(sc->rl_ldata.rl_tx_list[nic_i].rl_cmdstat);
154 if (cmdstat & RL_TDESC_STAT_OWN)
158 sc->rl_ldata.rl_tx_considx = nic_i;
159 sc->rl_ldata.rl_tx_free += n;
160 kring->nr_hwtail = nm_prev(netmap_idx_n2k(kring, nic_i), lim);
169 * Reconcile kernel and user view of the receive ring.
172 re_netmap_rxsync(struct netmap_kring *kring, int flags)
174 struct netmap_adapter *na = kring->na;
175 struct ifnet *ifp = na->ifp;
176 struct netmap_ring *ring = kring->ring;
177 u_int nm_i; /* index into the netmap ring */
178 u_int nic_i; /* index into the NIC ring */
180 u_int const lim = kring->nkr_num_slots - 1;
181 u_int const head = kring->rhead;
182 int force_update = (flags & NAF_FORCE_READ) || kring->nr_kflags & NKR_PENDINTR;
184 /* device-specific */
185 struct rl_softc *sc = ifp->if_softc;
186 struct rl_rxdesc *rxd = sc->rl_ldata.rl_rx_desc;
189 return netmap_ring_reinit(kring);
191 bus_dmamap_sync(sc->rl_ldata.rl_rx_list_tag,
192 sc->rl_ldata.rl_rx_list_map,
193 BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
196 * First part: import newly received packets.
198 * This device uses all the buffers in the ring, so we need
199 * another termination condition in addition to RL_RDESC_STAT_OWN
200 * cleared (all buffers could have it cleared). The easiest one
201 * is to stop right before nm_hwcur.
203 if (netmap_no_pendintr || force_update) {
204 uint32_t stop_i = nm_prev(kring->nr_hwcur, lim);
206 nic_i = sc->rl_ldata.rl_rx_prodidx; /* next pkt to check */
207 nm_i = netmap_idx_n2k(kring, nic_i);
209 while (nm_i != stop_i) {
210 struct rl_desc *cur_rx = &sc->rl_ldata.rl_rx_list[nic_i];
211 uint32_t rxstat = le32toh(cur_rx->rl_cmdstat);
214 if ((rxstat & RL_RDESC_STAT_OWN) != 0)
216 total_len = rxstat & sc->rl_rxlenmask;
217 /* XXX subtract crc */
218 total_len = (total_len < 4) ? 0 : total_len - 4;
219 ring->slot[nm_i].len = total_len;
220 ring->slot[nm_i].flags = 0;
221 /* sync was in re_newbuf() */
222 bus_dmamap_sync(sc->rl_ldata.rl_rx_mtag,
223 rxd[nic_i].rx_dmamap, BUS_DMASYNC_POSTREAD);
224 // if_inc_counter(sc->rl_ifp, IFCOUNTER_IPACKETS, 1);
225 nm_i = nm_next(nm_i, lim);
226 nic_i = nm_next(nic_i, lim);
228 sc->rl_ldata.rl_rx_prodidx = nic_i;
229 kring->nr_hwtail = nm_i;
230 kring->nr_kflags &= ~NKR_PENDINTR;
234 * Second part: skip past packets that userspace has released.
236 nm_i = kring->nr_hwcur;
238 nic_i = netmap_idx_k2n(kring, nm_i);
239 for (n = 0; nm_i != head; n++) {
240 struct netmap_slot *slot = &ring->slot[nm_i];
242 void *addr = PNMB(na, slot, &paddr);
244 struct rl_desc *desc = &sc->rl_ldata.rl_rx_list[nic_i];
245 int cmd = NETMAP_BUF_SIZE(na) | RL_RDESC_CMD_OWN;
247 if (addr == NETMAP_BUF_BASE(na)) /* bad buf */
250 if (nic_i == lim) /* mark end of ring */
251 cmd |= RL_RDESC_CMD_EOR;
253 if (slot->flags & NS_BUF_CHANGED) {
254 /* buffer has changed, reload map */
255 desc->rl_bufaddr_lo = htole32(RL_ADDR_LO(paddr));
256 desc->rl_bufaddr_hi = htole32(RL_ADDR_HI(paddr));
257 netmap_reload_map(na, sc->rl_ldata.rl_rx_mtag,
258 rxd[nic_i].rx_dmamap, addr);
259 slot->flags &= ~NS_BUF_CHANGED;
261 desc->rl_cmdstat = htole32(cmd);
262 bus_dmamap_sync(sc->rl_ldata.rl_rx_mtag,
263 rxd[nic_i].rx_dmamap,
264 BUS_DMASYNC_PREREAD);
265 nm_i = nm_next(nm_i, lim);
266 nic_i = nm_next(nic_i, lim);
268 kring->nr_hwcur = head;
270 bus_dmamap_sync(sc->rl_ldata.rl_rx_list_tag,
271 sc->rl_ldata.rl_rx_list_map,
272 BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
278 return netmap_ring_reinit(kring);
283 * Additional routines to init the tx and rx rings.
284 * In other drivers we do that inline in the main code.
287 re_netmap_tx_init(struct rl_softc *sc)
289 struct rl_txdesc *txd;
290 struct rl_desc *desc;
292 struct netmap_adapter *na = NA(sc->rl_ifp);
293 struct netmap_slot *slot;
295 slot = netmap_reset(na, NR_TX, 0, 0);
296 /* slot is NULL if we are not in native netmap mode */
299 /* in netmap mode, overwrite addresses and maps */
300 txd = sc->rl_ldata.rl_tx_desc;
301 desc = sc->rl_ldata.rl_tx_list;
302 n = sc->rl_ldata.rl_tx_desc_cnt;
304 /* l points in the netmap ring, i points in the NIC ring */
305 for (i = 0; i < n; i++) {
307 int l = netmap_idx_n2k(na->tx_rings[0], i);
308 void *addr = PNMB(na, slot + l, &paddr);
310 desc[i].rl_bufaddr_lo = htole32(RL_ADDR_LO(paddr));
311 desc[i].rl_bufaddr_hi = htole32(RL_ADDR_HI(paddr));
312 netmap_load_map(na, sc->rl_ldata.rl_tx_mtag,
313 txd[i].tx_dmamap, addr);
318 re_netmap_rx_init(struct rl_softc *sc)
320 struct netmap_adapter *na = NA(sc->rl_ifp);
321 struct netmap_slot *slot = netmap_reset(na, NR_RX, 0, 0);
322 struct rl_desc *desc = sc->rl_ldata.rl_rx_list;
324 uint32_t nic_i, max_avail;
325 uint32_t const n = sc->rl_ldata.rl_rx_desc_cnt;
330 * Do not release the slots owned by userspace,
331 * and also keep one empty.
333 max_avail = n - 1 - nm_kr_rxspace(na->rx_rings[0]);
334 for (nic_i = 0; nic_i < n; nic_i++) {
337 uint32_t nm_i = netmap_idx_n2k(na->rx_rings[0], nic_i);
339 addr = PNMB(na, slot + nm_i, &paddr);
341 netmap_reload_map(na, sc->rl_ldata.rl_rx_mtag,
342 sc->rl_ldata.rl_rx_desc[nic_i].rx_dmamap, addr);
343 bus_dmamap_sync(sc->rl_ldata.rl_rx_mtag,
344 sc->rl_ldata.rl_rx_desc[nic_i].rx_dmamap, BUS_DMASYNC_PREREAD);
345 desc[nic_i].rl_bufaddr_lo = htole32(RL_ADDR_LO(paddr));
346 desc[nic_i].rl_bufaddr_hi = htole32(RL_ADDR_HI(paddr));
347 cmdstat = NETMAP_BUF_SIZE(na);
348 if (nic_i == n - 1) /* mark the end of ring */
349 cmdstat |= RL_RDESC_CMD_EOR;
350 if (nic_i < max_avail)
351 cmdstat |= RL_RDESC_CMD_OWN;
352 desc[nic_i].rl_cmdstat = htole32(cmdstat);
358 re_netmap_attach(struct rl_softc *sc)
360 struct netmap_adapter na;
362 bzero(&na, sizeof(na));
365 na.na_flags = NAF_BDG_MAYSLEEP;
366 na.num_tx_desc = sc->rl_ldata.rl_tx_desc_cnt;
367 na.num_rx_desc = sc->rl_ldata.rl_rx_desc_cnt;
368 na.nm_txsync = re_netmap_txsync;
369 na.nm_rxsync = re_netmap_rxsync;
370 na.nm_register = re_netmap_reg;
371 na.num_tx_rings = na.num_rx_rings = 1;