2 * Copyright (C) 2011-2014 Matteo Landi, Luigi Rizzo. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
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.
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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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
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30 * netmap support for: lem
32 * For details on netmap support please see ixgbe_netmap.h
36 #include <net/netmap.h>
37 #include <sys/selinfo.h>
39 #include <vm/pmap.h> /* vtophys ? */
40 #include <dev/netmap/netmap_kern.h>
44 * Register/unregister. We are already under netmap lock.
47 lem_netmap_reg(struct netmap_adapter *na, int onoff)
49 struct ifnet *ifp = na->ifp;
50 struct adapter *adapter = ifp->if_softc;
52 EM_CORE_LOCK(adapter);
54 lem_disable_intr(adapter);
56 /* Tell the stack that the interface is no longer active */
57 ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | IFF_DRV_OACTIVE);
59 #ifndef EM_LEGACY_IRQ // XXX do we need this ?
60 taskqueue_block(adapter->tq);
61 taskqueue_drain(adapter->tq, &adapter->rxtx_task);
62 taskqueue_drain(adapter->tq, &adapter->link_task);
63 #endif /* !EM_LEGCY_IRQ */
65 /* enable or disable flags and callbacks in na and ifp */
67 nm_set_native_flags(na);
69 nm_clear_native_flags(na);
71 lem_init_locked(adapter); /* also enable intr */
74 taskqueue_unblock(adapter->tq); // XXX do we need this ?
75 #endif /* !EM_LEGCY_IRQ */
77 EM_CORE_UNLOCK(adapter);
79 return (ifp->if_drv_flags & IFF_DRV_RUNNING ? 0 : 1);
84 * Reconcile kernel and user view of the transmit ring.
87 lem_netmap_txsync(struct netmap_adapter *na, u_int ring_nr, int flags)
89 struct ifnet *ifp = na->ifp;
90 struct netmap_kring *kring = &na->tx_rings[ring_nr];
91 struct netmap_ring *ring = kring->ring;
92 u_int nm_i; /* index into the netmap ring */
93 u_int nic_i; /* index into the NIC ring */
94 u_int const lim = kring->nkr_num_slots - 1;
95 u_int const head = kring->rhead;
96 /* generate an interrupt approximately every half ring */
97 u_int report_frequency = kring->nkr_num_slots >> 1;
100 struct adapter *adapter = ifp->if_softc;
102 bus_dmamap_sync(adapter->txdma.dma_tag, adapter->txdma.dma_map,
103 BUS_DMASYNC_POSTREAD);
106 * First part: process new packets to send.
109 nm_i = kring->nr_hwcur;
110 if (nm_i != head) { /* we have new packets to send */
111 nic_i = netmap_idx_k2n(kring, nm_i);
112 while (nm_i != head) {
113 struct netmap_slot *slot = &ring->slot[nm_i];
114 u_int len = slot->len;
116 void *addr = PNMB(slot, &paddr);
118 /* device-specific */
119 struct e1000_tx_desc *curr = &adapter->tx_desc_base[nic_i];
120 struct em_buffer *txbuf = &adapter->tx_buffer_area[nic_i];
121 int flags = (slot->flags & NS_REPORT ||
122 nic_i == 0 || nic_i == report_frequency) ?
123 E1000_TXD_CMD_RS : 0;
125 NM_CHECK_ADDR_LEN(addr, len);
127 if (slot->flags & NS_BUF_CHANGED) {
128 /* buffer has changed, reload map */
129 curr->buffer_addr = htole64(paddr);
130 netmap_reload_map(adapter->txtag, txbuf->map, addr);
132 slot->flags &= ~(NS_REPORT | NS_BUF_CHANGED);
134 /* Fill the slot in the NIC ring. */
135 curr->upper.data = 0;
136 curr->lower.data = htole32(adapter->txd_cmd | len |
137 (E1000_TXD_CMD_EOP | flags) );
138 bus_dmamap_sync(adapter->txtag, txbuf->map,
139 BUS_DMASYNC_PREWRITE);
141 nm_i = nm_next(nm_i, lim);
142 nic_i = nm_next(nic_i, lim);
144 kring->nr_hwcur = head;
146 /* synchronize the NIC ring */
147 bus_dmamap_sync(adapter->txdma.dma_tag, adapter->txdma.dma_map,
148 BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
150 /* (re)start the tx unit up to slot nic_i (excluded) */
151 E1000_WRITE_REG(&adapter->hw, E1000_TDT(0), nic_i);
155 * Second part: reclaim buffers for completed transmissions.
157 if (ticks != kring->last_reclaim || flags & NAF_FORCE_RECLAIM || nm_kr_txempty(kring)) {
158 kring->last_reclaim = ticks;
159 /* record completed transmissions using TDH */
160 nic_i = E1000_READ_REG(&adapter->hw, E1000_TDH(0));
161 if (nic_i >= kring->nkr_num_slots) { /* XXX can it happen ? */
162 D("TDH wrap %d", nic_i);
163 nic_i -= kring->nkr_num_slots;
165 adapter->next_tx_to_clean = nic_i;
166 kring->nr_hwtail = nm_prev(netmap_idx_n2k(kring, nic_i), lim);
169 nm_txsync_finalize(kring);
176 * Reconcile kernel and user view of the receive ring.
179 lem_netmap_rxsync(struct netmap_adapter *na, u_int ring_nr, int flags)
181 struct ifnet *ifp = na->ifp;
182 struct netmap_kring *kring = &na->rx_rings[ring_nr];
183 struct netmap_ring *ring = kring->ring;
184 u_int nm_i; /* index into the netmap ring */
185 u_int nic_i; /* index into the NIC ring */
187 u_int const lim = kring->nkr_num_slots - 1;
188 u_int const head = nm_rxsync_prologue(kring);
189 int force_update = (flags & NAF_FORCE_READ) || kring->nr_kflags & NKR_PENDINTR;
191 /* device-specific */
192 struct adapter *adapter = ifp->if_softc;
195 return netmap_ring_reinit(kring);
197 /* XXX check sync modes */
198 bus_dmamap_sync(adapter->rxdma.dma_tag, adapter->rxdma.dma_map,
199 BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
202 * First part: import newly received packets.
204 if (netmap_no_pendintr || force_update) {
205 uint16_t slot_flags = kring->nkr_slot_flags;
207 nic_i = adapter->next_rx_desc_to_check;
208 nm_i = netmap_idx_n2k(kring, nic_i);
211 struct e1000_rx_desc *curr = &adapter->rx_desc_base[nic_i];
212 uint32_t staterr = le32toh(curr->status);
215 if ((staterr & E1000_RXD_STAT_DD) == 0)
217 len = le16toh(curr->length) - 4; // CRC
219 D("bogus pkt size %d nic idx %d", len, nic_i);
222 ring->slot[nm_i].len = len;
223 ring->slot[nm_i].flags = slot_flags;
224 bus_dmamap_sync(adapter->rxtag,
225 adapter->rx_buffer_area[nic_i].map,
226 BUS_DMASYNC_POSTREAD);
227 nm_i = nm_next(nm_i, lim);
228 nic_i = nm_next(nic_i, lim);
230 if (n) { /* update the state variables */
231 ND("%d new packets at nic %d nm %d tail %d",
233 adapter->next_rx_desc_to_check,
234 netmap_idx_n2k(kring, adapter->next_rx_desc_to_check),
236 adapter->next_rx_desc_to_check = nic_i;
237 // ifp->if_ipackets += n;
238 kring->nr_hwtail = nm_i;
240 kring->nr_kflags &= ~NKR_PENDINTR;
244 * Second part: skip past packets that userspace has released.
246 nm_i = kring->nr_hwcur;
248 nic_i = netmap_idx_k2n(kring, nm_i);
249 for (n = 0; nm_i != head; n++) {
250 struct netmap_slot *slot = &ring->slot[nm_i];
252 void *addr = PNMB(slot, &paddr);
254 struct e1000_rx_desc *curr = &adapter->rx_desc_base[nic_i];
255 struct em_buffer *rxbuf = &adapter->rx_buffer_area[nic_i];
257 if (addr == netmap_buffer_base) /* bad buf */
260 if (slot->flags & NS_BUF_CHANGED) {
261 /* buffer has changed, reload map */
262 curr->buffer_addr = htole64(paddr);
263 netmap_reload_map(adapter->rxtag, rxbuf->map, addr);
264 slot->flags &= ~NS_BUF_CHANGED;
267 bus_dmamap_sync(adapter->rxtag, rxbuf->map,
268 BUS_DMASYNC_PREREAD);
269 nm_i = nm_next(nm_i, lim);
270 nic_i = nm_next(nic_i, lim);
272 kring->nr_hwcur = head;
273 bus_dmamap_sync(adapter->rxdma.dma_tag, adapter->rxdma.dma_map,
274 BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
276 * IMPORTANT: we must leave one free slot in the ring,
277 * so move nic_i back by one unit
279 nic_i = nm_prev(nic_i, lim);
280 E1000_WRITE_REG(&adapter->hw, E1000_RDT(0), nic_i);
283 /* tell userspace that there might be new packets */
284 nm_rxsync_finalize(kring);
289 return netmap_ring_reinit(kring);
294 lem_netmap_attach(struct adapter *adapter)
296 struct netmap_adapter na;
298 bzero(&na, sizeof(na));
300 na.ifp = adapter->ifp;
301 na.na_flags = NAF_BDG_MAYSLEEP;
302 na.num_tx_desc = adapter->num_tx_desc;
303 na.num_rx_desc = adapter->num_rx_desc;
304 na.nm_txsync = lem_netmap_txsync;
305 na.nm_rxsync = lem_netmap_rxsync;
306 na.nm_register = lem_netmap_reg;
307 na.num_tx_rings = na.num_rx_rings = 1;