1 files changed, 415 insertions, 0 deletions

diff --git a/sys/dev/netmap/if_re_netmap.h b/sys/dev/netmap/if_re_netmap.h
new file mode 100644
index 0000000..efccf3a
--- /dev/null
+++ b/sys/dev/netmap/if_re_netmap.h
@@ -0,0 +1,415 @@
+/*
+ * Copyright (C) 2011 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_re_netmap.h 9662 2011-11-16 13:18:06Z luigi $
+ *
+ * netmap support for if_re
+ */
+
+#include <net/netmap.h>
+#include <sys/selinfo.h>
+#include <vm/vm.h>
+#include <vm/pmap.h>    /* vtophys ? */
+#include <dev/netmap/netmap_kern.h>
+
+static int re_netmap_reg(struct ifnet *, int onoff);
+static int re_netmap_txsync(void *, u_int, int);
+static int re_netmap_rxsync(void *, u_int, int);
+static void re_netmap_lock_wrapper(void *, int, u_int);
+
+static void
+re_netmap_attach(struct rl_softc *sc)
+{
+	struct netmap_adapter na;
+
+	bzero(&na, sizeof(na));
+
+	na.ifp = sc->rl_ifp;
+	na.separate_locks = 0;
+	na.num_tx_desc = sc->rl_ldata.rl_tx_desc_cnt;
+	na.num_rx_desc = sc->rl_ldata.rl_rx_desc_cnt;
+	na.nm_txsync = re_netmap_txsync;
+	na.nm_rxsync = re_netmap_rxsync;
+	na.nm_lock = re_netmap_lock_wrapper;
+	na.nm_register = re_netmap_reg;
+	na.buff_size = MCLBYTES;
+	netmap_attach(&na, 1);
+}
+
+
+/*
+ * wrapper to export locks to the generic code
+ * We should not use the tx/rx locks
+ */
+static void
+re_netmap_lock_wrapper(void *_a, int what, u_int queueid)
+{
+	struct rl_softc *adapter = _a;
+
+	switch (what) {
+	case NETMAP_CORE_LOCK:
+		RL_LOCK(adapter);
+		break;
+	case NETMAP_CORE_UNLOCK:
+		RL_UNLOCK(adapter);
+		break;
+
+	case NETMAP_TX_LOCK:
+	case NETMAP_RX_LOCK:
+	case NETMAP_TX_UNLOCK:
+	case NETMAP_RX_UNLOCK:
+		D("invalid lock call %d, no tx/rx locks here", what);
+		break;
+	}
+}
+
+
+/*
+ * support for netmap register/unregisted. We are already under core lock.
+ * only called on the first register or the last unregister.
+ */
+static int
+re_netmap_reg(struct ifnet *ifp, int onoff)
+{
+	struct rl_softc *adapter = ifp->if_softc;
+	struct netmap_adapter *na = NA(ifp);
+	int error = 0;
+
+	if (!na)
+		return EINVAL;
+	/* Tell the stack that the interface is no longer active */
+	ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | IFF_DRV_OACTIVE);
+
+	re_stop(adapter);
+
+	if (onoff) {
+		ifp->if_capenable |= IFCAP_NETMAP;
+
+		/* save if_transmit and restore it */
+		na->if_transmit = ifp->if_transmit;
+		/* XXX if_start and if_qflush ??? */
+		ifp->if_transmit = netmap_start;
+
+		re_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;
+		re_init_locked(adapter);	/* also enables intr */
+	}
+    return (error);
+
+}
+
+
+/*
+ * Reconcile kernel and user view of the transmit ring.
+ *
+ * Userspace has filled tx slots up to cur (excluded).
+ * The last unused slot previously known to the kernel was nr_hwcur,
+ * and the last interrupt reported nr_hwavail slots available
+ * (using the special value -1 to indicate idle transmit ring).
+ * The function must first update avail to what the kernel
+ * knows (translating the -1 to nkr_num_slots - 1),
+ * subtract the newly used slots (cur - nr_hwcur)
+ * from both avail and nr_hwavail, and set nr_hwcur = cur
+ * issuing a dmamap_sync on all slots.
+ */
+static int
+re_netmap_txsync(void *a, u_int ring_nr, int do_lock)
+{
+	struct rl_softc *sc = a;
+	struct rl_txdesc *txd = sc->rl_ldata.rl_tx_desc;
+	struct netmap_adapter *na = NA(sc->rl_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;
+
+	k = ring->cur;
+	if ( (kring->nr_kflags & NR_REINIT) || k > lim)
+		return netmap_ring_reinit(kring);
+
+	if (do_lock)
+		RL_LOCK(sc);
+
+	/* Sync the TX descriptor list */
+	bus_dmamap_sync(sc->rl_ldata.rl_tx_list_tag,
+            sc->rl_ldata.rl_tx_list_map,
+            BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
+
+	/* record completed transmissions */
+        for (n = 0, j = sc->rl_ldata.rl_tx_considx;
+	    j != sc->rl_ldata.rl_tx_prodidx;
+	    n++, j = RL_TX_DESC_NXT(sc, j)) {
+		uint32_t cmdstat =
+			le32toh(sc->rl_ldata.rl_tx_list[j].rl_cmdstat);
+		if (cmdstat & RL_TDESC_STAT_OWN)
+			break;
+	}
+	if (n > 0) {
+		sc->rl_ldata.rl_tx_considx = j;
+		sc->rl_ldata.rl_tx_free += n;
+		kring->nr_hwavail += n;
+	}
+
+	/* update avail to what the hardware knows */
+	ring->avail = kring->nr_hwavail;
+	
+	/* we trust prodidx, not hwcur */
+	j = kring->nr_hwcur = sc->rl_ldata.rl_tx_prodidx;
+	if (j != k) {	/* we have new packets to send */
+		n = 0;
+		while (j != k) {
+			struct netmap_slot *slot = &ring->slot[j];
+			struct rl_desc *desc = &sc->rl_ldata.rl_tx_list[j];
+			int cmd = slot->len | RL_TDESC_CMD_EOF |
+				RL_TDESC_CMD_OWN | RL_TDESC_CMD_SOF ;
+			void *addr = NMB(slot);
+			int len = slot->len;
+
+			if (addr == netmap_buffer_base || len > NETMAP_BUF_SIZE) {
+				if (do_lock)
+					RL_UNLOCK(sc);
+				return netmap_ring_reinit(kring);
+			}
+			
+			if (j == lim)	/* mark end of ring */
+				cmd |= RL_TDESC_CMD_EOR;
+
+			if (slot->flags & NS_BUF_CHANGED) {
+				uint64_t paddr = vtophys(addr);
+				desc->rl_bufaddr_lo = htole32(RL_ADDR_LO(paddr));
+				desc->rl_bufaddr_hi = htole32(RL_ADDR_HI(paddr));
+				/* buffer has changed, unload and reload map */
+				netmap_reload_map(sc->rl_ldata.rl_tx_mtag,
+					txd[j].tx_dmamap, addr, na->buff_size);
+				slot->flags &= ~NS_BUF_CHANGED;
+			}
+			slot->flags &= ~NS_REPORT;
+			desc->rl_cmdstat = htole32(cmd);
+			bus_dmamap_sync(sc->rl_ldata.rl_tx_mtag,
+				txd[j].tx_dmamap, BUS_DMASYNC_PREWRITE);
+			j = (j == lim) ? 0 : j + 1;
+			n++;
+		}
+		sc->rl_ldata.rl_tx_prodidx = kring->nr_hwcur = ring->cur;
+
+		/* decrease avail by number of sent packets */
+		ring->avail -= n;
+		kring->nr_hwavail = ring->avail;
+
+		bus_dmamap_sync(sc->rl_ldata.rl_tx_list_tag,
+		    sc->rl_ldata.rl_tx_list_map,
+		    BUS_DMASYNC_PREWRITE|BUS_DMASYNC_PREREAD);
+
+		/* start ? */
+		CSR_WRITE_1(sc, sc->rl_txstart, RL_TXSTART_START);
+	}
+	if (do_lock)
+		RL_UNLOCK(sc);
+	return 0;
+}
+
+
+/*
+ * Reconcile kernel and user view of the receive ring.
+ *
+ * Userspace has read rx slots up to cur (excluded).
+ * The last unread slot previously known to the kernel was nr_hwcur,
+ * and the last interrupt reported nr_hwavail slots available.
+ * We must subtract the newly consumed slots (cur - nr_hwcur)
+ * from nr_hwavail, clearing the descriptors for the next
+ * read, tell the hardware that they are available,
+ * and set nr_hwcur = cur and avail = nr_hwavail.
+ * issuing a dmamap_sync on all slots.
+ */
+static int
+re_netmap_rxsync(void *a, u_int ring_nr, int do_lock)
+{
+	struct rl_softc *sc = a;
+	struct rl_rxdesc *rxd = sc->rl_ldata.rl_rx_desc;
+	struct netmap_adapter *na = NA(sc->rl_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)
+		RL_LOCK(sc);
+	/* XXX check sync modes */
+	bus_dmamap_sync(sc->rl_ldata.rl_rx_list_tag,
+	    sc->rl_ldata.rl_rx_list_map,
+	    BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
+
+	/*
+	 * The device uses all the buffers in the ring, so we need
+	 * another termination condition in addition to RL_RDESC_STAT_OWN
+	 * cleared (all buffers could have it cleared. The easiest one
+	 * is to limit the amount of data reported up to 'lim'
+	 */
+	j = sc->rl_ldata.rl_rx_prodidx;
+	for (n = kring->nr_hwavail; n < lim ; n++) {
+		struct rl_desc *cur_rx = &sc->rl_ldata.rl_rx_list[j];
+		uint32_t rxstat = le32toh(cur_rx->rl_cmdstat);
+		uint32_t total_len;
+
+		if ((rxstat & RL_RDESC_STAT_OWN) != 0)
+			break;
+		total_len = rxstat & sc->rl_rxlenmask;
+		/* XXX subtract crc */
+		total_len = (total_len < 4) ? 0 : total_len - 4;
+		kring->ring->slot[j].len = total_len;
+		/*  sync was in re_newbuf() */
+		bus_dmamap_sync(sc->rl_ldata.rl_rx_mtag,
+		    rxd[j].rx_dmamap, BUS_DMASYNC_POSTREAD);
+		j = RL_RX_DESC_NXT(sc, j);
+	}
+	if (n != kring->nr_hwavail) {
+		sc->rl_ldata.rl_rx_prodidx = j;
+		sc->rl_ifp->if_ipackets += n - kring->nr_hwavail;
+		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 rl_desc *desc = &sc->rl_ldata.rl_rx_list[j];
+			int cmd = na->buff_size | RL_RDESC_CMD_OWN;
+			void *addr = NMB(slot);
+
+			if (addr == netmap_buffer_base) { /* bad buf */
+				if (do_lock)
+					RL_UNLOCK(sc);
+				return netmap_ring_reinit(kring);
+			}
+
+			if (j == lim)	/* mark end of ring */
+				cmd |= RL_RDESC_CMD_EOR;
+
+			desc->rl_cmdstat = htole32(cmd);
+			slot->flags &= ~NS_REPORT;
+			if (slot->flags & NS_BUF_CHANGED) {
+				uint64_t paddr = vtophys(addr);
+				desc->rl_bufaddr_lo = htole32(RL_ADDR_LO(paddr));
+				desc->rl_bufaddr_hi = htole32(RL_ADDR_HI(paddr));
+				netmap_reload_map(sc->rl_ldata.rl_rx_mtag,
+					rxd[j].rx_dmamap, addr, na->buff_size);
+				slot->flags &= ~NS_BUF_CHANGED;
+			}
+			bus_dmamap_sync(sc->rl_ldata.rl_rx_mtag,
+				rxd[j].rx_dmamap, BUS_DMASYNC_PREREAD);
+			j = (j == lim) ? 0 : j + 1;
+			n++;
+		}
+		kring->nr_hwavail -= n;
+		kring->nr_hwcur = k;
+		/* Flush the RX DMA ring */
+
+		bus_dmamap_sync(sc->rl_ldata.rl_rx_list_tag,
+		    sc->rl_ldata.rl_rx_list_map,
+		    BUS_DMASYNC_PREWRITE|BUS_DMASYNC_PREREAD);
+	}
+	/* tell userspace that there are new packets */
+	ring->avail = kring->nr_hwavail ;
+	if (do_lock)
+		RL_UNLOCK(sc);
+	return 0;
+}
+
+static void
+re_netmap_tx_init(struct rl_softc *sc)
+{   
+	struct rl_txdesc *txd;
+	struct rl_desc *desc;
+	int i;
+	struct netmap_adapter *na = NA(sc->rl_ifp);
+	struct netmap_slot *slot = netmap_reset(na, NR_TX, 0, 0);
+
+	/* slot is NULL if we are not in netmap mode */
+	if (!slot)
+		return;
+	/* in netmap mode, overwrite addresses and maps */
+	txd = sc->rl_ldata.rl_tx_desc;
+	desc = sc->rl_ldata.rl_tx_list;
+
+	for (i = 0; i < sc->rl_ldata.rl_tx_desc_cnt; i++) {
+		void *addr = NMB(slot+i);
+		uint64_t paddr = vtophys(addr);
+
+		desc[i].rl_bufaddr_lo = htole32(RL_ADDR_LO(paddr));
+		desc[i].rl_bufaddr_hi = htole32(RL_ADDR_HI(paddr));
+		netmap_load_map(sc->rl_ldata.rl_tx_mtag,
+			txd[i].tx_dmamap, addr, na->buff_size);
+	}
+}
+
+static void
+re_netmap_rx_init(struct rl_softc *sc)
+{
+	/* slot is NULL if we are not in netmap mode */  
+	struct netmap_adapter *na = NA(sc->rl_ifp);
+	struct netmap_slot *slot = netmap_reset(na, NR_RX, 0, 0);
+	struct rl_desc *desc = sc->rl_ldata.rl_rx_list;
+	uint32_t cmdstat;
+	int i;
+
+	if (!slot)
+		return;
+
+	for (i = 0; i < sc->rl_ldata.rl_rx_desc_cnt; i++) {
+		void *addr = NMB(slot+i);
+		uint64_t paddr = vtophys(addr);
+
+		desc[i].rl_bufaddr_lo = htole32(RL_ADDR_LO(paddr));
+		desc[i].rl_bufaddr_hi = htole32(RL_ADDR_HI(paddr));
+		cmdstat = slot[i].len = na->buff_size; // XXX
+		if (i == sc->rl_ldata.rl_rx_desc_cnt - 1)
+			cmdstat |= RL_RDESC_CMD_EOR;
+		desc[i].rl_cmdstat = htole32(cmdstat | RL_RDESC_CMD_OWN);
+
+		netmap_reload_map(sc->rl_ldata.rl_rx_mtag,
+			sc->rl_ldata.rl_rx_desc[i].rx_dmamap,
+			addr, na->buff_size);
+	}
+}