1 files changed, 383 insertions, 0 deletions

diff --git a/sys/dev/netmap/if_em_netmap.h b/sys/dev/netmap/if_em_netmap.h
new file mode 100644
index 000000000000..0e220e755d68
--- /dev/null
+++ b/sys/dev/netmap/if_em_netmap.h
@@ -0,0 +1,383 @@
+/*
+ * Copyright (C) 2011 Matteo Landi, 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_em_netmap.h 9662 2011-11-16 13:18:06Z luigi $
+ *
+ * netmap changes for if_em.
+ */
+
+#include <net/netmap.h>
+#include <sys/selinfo.h>
+#include <vm/vm.h>
+#include <vm/pmap.h>    /* vtophys ? */
+#include <dev/netmap/netmap_kern.h>
+
+static void	em_netmap_block_tasks(struct adapter *);
+static void	em_netmap_unblock_tasks(struct adapter *);
+static int	em_netmap_reg(struct ifnet *, int onoff);
+static int	em_netmap_txsync(void *, u_int, int);
+static int	em_netmap_rxsync(void *, u_int, int);
+static void	em_netmap_lock_wrapper(void *, int, u_int);
+
+static void
+em_netmap_attach(struct adapter *adapter)
+{
+	struct netmap_adapter na;
+
+	bzero(&na, sizeof(na));
+
+	na.ifp = adapter->ifp;
+	na.separate_locks = 1;
+	na.num_tx_desc = adapter->num_tx_desc;
+	na.num_rx_desc = adapter->num_rx_desc;
+	na.nm_txsync = em_netmap_txsync;
+	na.nm_rxsync = em_netmap_rxsync;
+	na.nm_lock = em_netmap_lock_wrapper;
+	na.nm_register = em_netmap_reg;
+	/*
+	 * adapter->rx_mbuf_sz is set by SIOCSETMTU, but in netmap mode
+	 * we allocate the buffers on the first register. So we must
+	 * disallow a SIOCSETMTU when if_capenable & IFCAP_NETMAP is set.
+	 */
+	na.buff_size = MCLBYTES;
+	netmap_attach(&na, adapter->num_queues);
+}
+
+
+/*
+ * wrapper to export locks to the generic code
+ */
+static void
+em_netmap_lock_wrapper(void *_a, int what, u_int queueid)
+{
+	struct adapter *adapter = _a;
+
+	ASSERT(queueid < adapter->num_queues);
+	switch (what) {
+		case NETMAP_CORE_LOCK:
+		EM_CORE_LOCK(adapter);
+		break;
+	case NETMAP_CORE_UNLOCK:
+		EM_CORE_UNLOCK(adapter);
+		break;
+	case NETMAP_TX_LOCK:
+		EM_TX_LOCK(&adapter->tx_rings[queueid]);
+		break;
+	case NETMAP_TX_UNLOCK:
+		EM_TX_UNLOCK(&adapter->tx_rings[queueid]);
+		break;
+	case NETMAP_RX_LOCK:
+		EM_RX_LOCK(&adapter->rx_rings[queueid]);
+		break;
+	case NETMAP_RX_UNLOCK:
+		EM_RX_UNLOCK(&adapter->rx_rings[queueid]);
+		break;
+	}
+}
+
+
+static void
+em_netmap_block_tasks(struct adapter *adapter)
+{
+	if (adapter->msix > 1) { /* MSIX */
+		int i;
+		struct tx_ring *txr = adapter->tx_rings;
+		struct rx_ring *rxr = adapter->rx_rings;
+
+		for (i = 0; i < adapter->num_queues; i++, txr++, rxr++) {
+			taskqueue_block(txr->tq);
+			taskqueue_drain(txr->tq, &txr->tx_task);
+			taskqueue_block(rxr->tq);
+			taskqueue_drain(rxr->tq, &rxr->rx_task);
+		}
+	} else {	/* legacy */
+		taskqueue_block(adapter->tq);
+		taskqueue_drain(adapter->tq, &adapter->link_task);
+		taskqueue_drain(adapter->tq, &adapter->que_task);
+	}
+}
+
+
+static void
+em_netmap_unblock_tasks(struct adapter *adapter)
+{
+	if (adapter->msix > 1) {
+		struct tx_ring *txr = adapter->tx_rings;
+		struct rx_ring *rxr = adapter->rx_rings;
+		int i;
+
+		for (i = 0; i < adapter->num_queues; i++) {
+			taskqueue_unblock(txr->tq);
+			taskqueue_unblock(rxr->tq);
+		}
+	} else { /* legacy */
+		taskqueue_unblock(adapter->tq);
+	}
+}
+
+/*
+ * register-unregister routine
+ */
+static int
+em_netmap_reg(struct ifnet *ifp, int onoff)
+{
+	struct adapter *adapter = ifp->if_softc;
+	struct netmap_adapter *na = NA(ifp);
+	int error = 0;
+
+	if (na == NULL)
+		return EINVAL;	/* no netmap support here */
+
+	em_disable_intr(adapter);
+
+	/* Tell the stack that the interface is no longer active */
+	ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | IFF_DRV_OACTIVE);
+
+	em_netmap_block_tasks(adapter);
+
+	if (onoff) {
+		ifp->if_capenable |= IFCAP_NETMAP;
+
+		/* save if_transmit for later restore.
+		 * XXX also if_start and if_qflush ?
+		 */
+		na->if_transmit = ifp->if_transmit;
+		ifp->if_transmit = netmap_start;
+
+		em_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;
+		em_init_locked(adapter);	/* also enable intr */
+
+	}
+	em_netmap_unblock_tasks(adapter);
+	return (error);
+}
+
+/*
+ * Reconcile hardware and user view of the transmit ring, see
+ * ixgbe.c for details.
+ */
+static int
+em_netmap_txsync(void *a, u_int ring_nr, int do_lock)
+{
+	struct adapter *adapter = a;
+	struct tx_ring *txr = &adapter->tx_rings[ring_nr];
+	struct netmap_adapter *na = NA(adapter->ifp);
+	struct netmap_kring *kring = &na->tx_rings[ring_nr];
+	struct netmap_ring *ring = kring->ring;
+	int j, k, n, lim = kring->nkr_num_slots - 1;
+
+	/* generate an interrupt approximately every half ring */
+	int report_frequency = kring->nkr_num_slots >> 1;
+
+	k = ring->cur;
+	if ( (kring->nr_kflags & NR_REINIT) || k > lim)
+		return netmap_ring_reinit(kring);
+
+	if (do_lock)
+		EM_TX_LOCK(txr);
+	bus_dmamap_sync(txr->txdma.dma_tag, txr->txdma.dma_map,
+			BUS_DMASYNC_POSTREAD);
+
+	/* record completed transmissions TODO
+	 *
+	 * instead of using TDH, we could read the transmitted status bit.
+	 */
+	j = E1000_READ_REG(&adapter->hw, E1000_TDH(ring_nr));
+	if (j >= kring->nkr_num_slots) { /* XXX can happen */
+		D("TDH wrap %d", j);
+		j -= kring->nkr_num_slots;
+	}
+	int delta = j - txr->next_to_clean;
+	if (delta) {
+		/* new transmissions were completed, increment
+		   ring->nr_hwavail. */
+		if (delta < 0)
+			delta += kring->nkr_num_slots;
+		txr->next_to_clean = j;
+		kring->nr_hwavail += delta;
+	}
+
+	/* update avail to what the hardware knows */
+	ring->avail = kring->nr_hwavail;
+
+	j = kring->nr_hwcur;
+	if (j != k) {	/* we have packets to send */
+		n = 0;
+		while (j != k) {
+			struct netmap_slot *slot = &ring->slot[j];
+			struct e1000_tx_desc *curr = &txr->tx_base[j];
+			struct em_buffer *txbuf = &txr->tx_buffers[j];
+			int flags = ((slot->flags & NS_REPORT) ||
+				j == 0 || j == report_frequency) ?
+					E1000_TXD_CMD_RS : 0;
+			void *addr = NMB(slot);
+			int len = slot->len;
+			if (addr == netmap_buffer_base || len > NETMAP_BUF_SIZE) {
+				if (do_lock)
+					EM_TX_UNLOCK(txr);
+				return netmap_ring_reinit(kring);
+			}
+
+			slot->flags &= ~NS_REPORT;
+			curr->upper.data = 0;
+			curr->lower.data = 
+			    htole32(
+				adapter->txd_cmd |
+				(E1000_TXD_CMD_EOP | flags) |
+				slot->len);
+			if (slot->flags & NS_BUF_CHANGED) {
+				curr->buffer_addr = htole64(vtophys(addr));
+				/* buffer has changed, unload and reload map */
+				netmap_reload_map(txr->txtag, txbuf->map,
+					addr, na->buff_size);
+				slot->flags &= ~NS_BUF_CHANGED;
+			}
+
+			bus_dmamap_sync(txr->txtag, txbuf->map,
+				BUS_DMASYNC_PREWRITE);
+			j = (j == lim) ? 0 : j + 1;
+			n++;
+		}
+		kring->nr_hwcur = ring->cur;
+
+		/* decrease avail by number of sent packets */
+		ring->avail -= n;
+		kring->nr_hwavail = ring->avail;
+
+		bus_dmamap_sync(txr->txdma.dma_tag, txr->txdma.dma_map,
+			BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
+
+		E1000_WRITE_REG(&adapter->hw, E1000_TDT(txr->me),
+			ring->cur);
+	}
+	if (do_lock)
+		EM_TX_UNLOCK(txr);
+	return 0;
+}
+
+/*
+ * Reconcile kernel and user view of the receive ring, see ixgbe.c
+ */
+static int
+em_netmap_rxsync(void *a, u_int ring_nr, int do_lock)
+{
+	struct adapter *adapter = a;
+	struct rx_ring *rxr = &adapter->rx_rings[ring_nr];
+	struct netmap_adapter *na = NA(adapter->ifp);
+	struct netmap_kring *kring = &na->rx_rings[ring_nr];
+	struct netmap_ring *ring = kring->ring;
+	int j, k, n, lim = kring->nkr_num_slots - 1;
+
+	k = ring->cur;
+	if ( (kring->nr_kflags & NR_REINIT) || k > lim)
+		return netmap_ring_reinit(kring);
+ 
+	if (do_lock)
+		EM_RX_LOCK(rxr);
+	/* XXX check sync modes */
+	bus_dmamap_sync(rxr->rxdma.dma_tag, rxr->rxdma.dma_map,
+			BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
+
+	/* acknowledge all the received packets. */
+	j = rxr->next_to_check;
+	for (n = 0; ; n++) {
+		struct e1000_rx_desc *curr = &rxr->rx_base[j];
+
+		if ((curr->status & E1000_RXD_STAT_DD) == 0)
+			break;
+		ring->slot[j].len = le16toh(curr->length);
+		bus_dmamap_sync(rxr->tag, rxr->rx_buffers[j].map,
+			BUS_DMASYNC_POSTREAD);
+		j = (j == lim) ? 0 : j + 1;
+	}
+	if (n) {
+		rxr->next_to_check = j;
+		kring->nr_hwavail += n;
+	}
+
+	/* skip past packets that userspace has already processed:
+	 * making them available for reception.
+	 * advance nr_hwcur and issue a bus_dmamap_sync on the
+	 * buffers so it is safe to write to them.
+	 * Also increase nr_hwavail
+         */
+	j = kring->nr_hwcur;
+	if (j != k) { /* userspace has read some packets. */
+		n = 0;
+		while (j != k) {
+			struct netmap_slot *slot = &ring->slot[j];
+			struct e1000_rx_desc *curr = &rxr->rx_base[j];
+			struct em_buffer *rxbuf = &rxr->rx_buffers[j];
+			void *addr = NMB(slot);
+
+			if (addr == netmap_buffer_base) { /* bad buf */
+				if (do_lock)
+					EM_RX_UNLOCK(rxr);
+				return netmap_ring_reinit(kring);
+			}
+
+			curr->status = 0;
+			if (slot->flags & NS_BUF_CHANGED) {
+				curr->buffer_addr = htole64(vtophys(addr));
+				/* buffer has changed, unload and reload map */
+				netmap_reload_map(rxr->rxtag, rxbuf->map,
+					addr, na->buff_size);
+				slot->flags &= ~NS_BUF_CHANGED;
+			}
+
+			bus_dmamap_sync(rxr->rxtag, rxbuf->map,
+				BUS_DMASYNC_PREREAD);
+
+			j = (j == lim) ? 0 : j + 1;
+			n++;
+		}
+		kring->nr_hwavail -= n;
+		kring->nr_hwcur = ring->cur;
+		bus_dmamap_sync(rxr->rxdma.dma_tag, rxr->rxdma.dma_map,
+			BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
+		/*
+		 * IMPORTANT: we must leave one free slot in the ring,
+		 * so move j back by one unit
+		 */
+		j = (j == 0) ? lim : j - 1;
+		E1000_WRITE_REG(&adapter->hw, E1000_RDT(rxr->me), j);
+	}
+	/* tell userspace that there are new packets */
+	ring->avail = kring->nr_hwavail ;
+	if (do_lock)
+		EM_RX_UNLOCK(rxr);
+	return 0;
+}