2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (C) 2011-2014 Matteo Landi, 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
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
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15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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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: em.
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>
44 // XXX do we need to block/unblock the tasks ?
46 em_netmap_block_tasks(struct adapter *adapter)
48 if (adapter->msix > 1) { /* MSIX */
50 struct tx_ring *txr = adapter->tx_rings;
51 struct rx_ring *rxr = adapter->rx_rings;
53 for (i = 0; i < adapter->num_queues; i++, txr++, rxr++) {
54 taskqueue_block(txr->tq);
55 taskqueue_drain(txr->tq, &txr->tx_task);
56 taskqueue_block(rxr->tq);
57 taskqueue_drain(rxr->tq, &rxr->rx_task);
60 taskqueue_block(adapter->tq);
61 taskqueue_drain(adapter->tq, &adapter->link_task);
62 taskqueue_drain(adapter->tq, &adapter->que_task);
68 em_netmap_unblock_tasks(struct adapter *adapter)
70 if (adapter->msix > 1) {
71 struct tx_ring *txr = adapter->tx_rings;
72 struct rx_ring *rxr = adapter->rx_rings;
75 for (i = 0; i < adapter->num_queues; i++, txr++, rxr++) {
76 taskqueue_unblock(txr->tq);
77 taskqueue_unblock(rxr->tq);
80 taskqueue_unblock(adapter->tq);
86 * Register/unregister. We are already under netmap lock.
89 em_netmap_reg(struct netmap_adapter *na, int onoff)
91 struct ifnet *ifp = na->ifp;
92 struct adapter *adapter = ifp->if_softc;
94 EM_CORE_LOCK(adapter);
95 em_disable_intr(adapter);
97 /* Tell the stack that the interface is no longer active */
98 ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | IFF_DRV_OACTIVE);
100 em_netmap_block_tasks(adapter);
101 /* enable or disable flags and callbacks in na and ifp */
103 nm_set_native_flags(na);
105 nm_clear_native_flags(na);
107 em_init_locked(adapter); /* also enable intr */
108 em_netmap_unblock_tasks(adapter);
109 EM_CORE_UNLOCK(adapter);
110 return (ifp->if_drv_flags & IFF_DRV_RUNNING ? 0 : 1);
115 * Reconcile kernel and user view of the transmit ring.
118 em_netmap_txsync(struct netmap_kring *kring, int flags)
120 struct netmap_adapter *na = kring->na;
121 struct ifnet *ifp = na->ifp;
122 struct netmap_ring *ring = kring->ring;
123 u_int nm_i; /* index into the netmap ring */
124 u_int nic_i; /* index into the NIC ring */
126 u_int const lim = kring->nkr_num_slots - 1;
127 u_int const head = kring->rhead;
128 /* generate an interrupt approximately every half ring */
129 u_int report_frequency = kring->nkr_num_slots >> 1;
131 /* device-specific */
132 struct adapter *adapter = ifp->if_softc;
133 struct tx_ring *txr = &adapter->tx_rings[kring->ring_id];
135 bus_dmamap_sync(txr->txdma.dma_tag, txr->txdma.dma_map,
136 BUS_DMASYNC_POSTREAD);
139 * First part: process new packets to send.
142 nm_i = kring->nr_hwcur;
143 if (nm_i != head) { /* we have new packets to send */
144 nic_i = netmap_idx_k2n(kring, nm_i);
145 for (n = 0; nm_i != head; n++) {
146 struct netmap_slot *slot = &ring->slot[nm_i];
147 u_int len = slot->len;
149 void *addr = PNMB(na, slot, &paddr);
151 /* device-specific */
152 struct e1000_tx_desc *curr = &txr->tx_base[nic_i];
153 struct em_txbuffer *txbuf = &txr->tx_buffers[nic_i];
154 int flags = (slot->flags & NS_REPORT ||
155 nic_i == 0 || nic_i == report_frequency) ?
156 E1000_TXD_CMD_RS : 0;
158 NM_CHECK_ADDR_LEN(na, addr, len);
160 if (slot->flags & NS_BUF_CHANGED) {
161 curr->buffer_addr = htole64(paddr);
162 /* buffer has changed, reload map */
163 netmap_reload_map(na, txr->txtag, txbuf->map, addr);
165 slot->flags &= ~(NS_REPORT | NS_BUF_CHANGED);
167 /* Fill the slot in the NIC ring. */
168 curr->upper.data = 0;
169 curr->lower.data = htole32(adapter->txd_cmd | len |
170 (E1000_TXD_CMD_EOP | flags) );
171 bus_dmamap_sync(txr->txtag, txbuf->map,
172 BUS_DMASYNC_PREWRITE);
174 nm_i = nm_next(nm_i, lim);
175 nic_i = nm_next(nic_i, lim);
177 kring->nr_hwcur = head;
179 /* synchronize the NIC ring */
180 bus_dmamap_sync(txr->txdma.dma_tag, txr->txdma.dma_map,
181 BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
183 /* (re)start the tx unit up to slot nic_i (excluded) */
184 E1000_WRITE_REG(&adapter->hw, E1000_TDT(txr->me), nic_i);
188 * Second part: reclaim buffers for completed transmissions.
190 if (flags & NAF_FORCE_RECLAIM || nm_kr_txempty(kring)) {
191 /* record completed transmissions using TDH */
192 nic_i = E1000_READ_REG(&adapter->hw, E1000_TDH(kring->ring_id));
193 if (nic_i >= kring->nkr_num_slots) { /* XXX can it happen ? */
194 D("TDH wrap %d", nic_i);
195 nic_i -= kring->nkr_num_slots;
197 if (nic_i != txr->next_to_clean) {
198 txr->next_to_clean = nic_i;
199 kring->nr_hwtail = nm_prev(netmap_idx_n2k(kring, nic_i), lim);
208 * Reconcile kernel and user view of the receive ring.
211 em_netmap_rxsync(struct netmap_kring *kring, int flags)
213 struct netmap_adapter *na = kring->na;
214 struct ifnet *ifp = na->ifp;
215 struct netmap_ring *ring = kring->ring;
216 u_int nm_i; /* index into the netmap ring */
217 u_int nic_i; /* index into the NIC ring */
219 u_int const lim = kring->nkr_num_slots - 1;
220 u_int const head = kring->rhead;
221 int force_update = (flags & NAF_FORCE_READ) || kring->nr_kflags & NKR_PENDINTR;
223 /* device-specific */
224 struct adapter *adapter = ifp->if_softc;
225 struct rx_ring *rxr = &adapter->rx_rings[kring->ring_id];
228 return netmap_ring_reinit(kring);
230 /* XXX check sync modes */
231 bus_dmamap_sync(rxr->rxdma.dma_tag, rxr->rxdma.dma_map,
232 BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
235 * First part: import newly received packets.
237 if (netmap_no_pendintr || force_update) {
238 nic_i = rxr->next_to_check;
239 nm_i = netmap_idx_n2k(kring, nic_i);
241 for (n = 0; ; n++) { // XXX no need to count
242 union e1000_rx_desc_extended *curr = &rxr->rx_base[nic_i];
243 uint32_t staterr = le32toh(curr->wb.upper.status_error);
245 if ((staterr & E1000_RXD_STAT_DD) == 0)
247 ring->slot[nm_i].len = le16toh(curr->wb.upper.length);
248 ring->slot[nm_i].flags = 0;
249 bus_dmamap_sync(rxr->rxtag, rxr->rx_buffers[nic_i].map,
250 BUS_DMASYNC_POSTREAD);
251 nm_i = nm_next(nm_i, lim);
252 /* make sure next_to_refresh follows next_to_check */
253 rxr->next_to_refresh = nic_i; // XXX
254 nic_i = nm_next(nic_i, lim);
256 if (n) { /* update the state variables */
257 rxr->next_to_check = nic_i;
258 kring->nr_hwtail = nm_i;
260 kring->nr_kflags &= ~NKR_PENDINTR;
264 * Second part: skip past packets that userspace has released.
266 nm_i = kring->nr_hwcur;
268 nic_i = netmap_idx_k2n(kring, nm_i);
269 for (n = 0; nm_i != head; n++) {
270 struct netmap_slot *slot = &ring->slot[nm_i];
272 void *addr = PNMB(na, slot, &paddr);
274 union e1000_rx_desc_extended *curr = &rxr->rx_base[nic_i];
275 struct em_rxbuffer *rxbuf = &rxr->rx_buffers[nic_i];
277 if (addr == NETMAP_BUF_BASE(na)) /* bad buf */
280 curr->read.buffer_addr = htole64(paddr);
281 if (slot->flags & NS_BUF_CHANGED) {
282 /* buffer has changed, reload map */
283 netmap_reload_map(na, rxr->rxtag, rxbuf->map, addr);
284 slot->flags &= ~NS_BUF_CHANGED;
286 curr->wb.upper.status_error = 0;
287 bus_dmamap_sync(rxr->rxtag, rxbuf->map,
288 BUS_DMASYNC_PREREAD);
289 nm_i = nm_next(nm_i, lim);
290 nic_i = nm_next(nic_i, lim);
292 kring->nr_hwcur = head;
294 bus_dmamap_sync(rxr->rxdma.dma_tag, rxr->rxdma.dma_map,
295 BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
297 * IMPORTANT: we must leave one free slot in the ring,
298 * so move nic_i back by one unit
300 nic_i = nm_prev(nic_i, lim);
301 E1000_WRITE_REG(&adapter->hw, E1000_RDT(rxr->me), nic_i);
307 return netmap_ring_reinit(kring);
312 em_netmap_attach(struct adapter *adapter)
314 struct netmap_adapter na;
316 bzero(&na, sizeof(na));
318 na.ifp = adapter->ifp;
319 na.na_flags = NAF_BDG_MAYSLEEP;
320 na.num_tx_desc = adapter->num_tx_desc;
321 na.num_rx_desc = adapter->num_rx_desc;
322 na.nm_txsync = em_netmap_txsync;
323 na.nm_rxsync = em_netmap_rxsync;
324 na.nm_register = em_netmap_reg;
325 na.num_tx_rings = na.num_rx_rings = adapter->num_queues;