svn commit: r292096 - in stable/10/sys/dev: ixl netmap
Steven Hartland
smh at FreeBSD.org
Fri Dec 11 12:24:12 UTC 2015
Author: smh
Date: Fri Dec 11 12:24:11 2015
New Revision: 292096
URL: https://svnweb.freebsd.org/changeset/base/292096
Log:
MFC r279232: Add native netmap support to ixl
Sponsored by: Multiplay
Added:
stable/10/sys/dev/netmap/if_ixl_netmap.h
- copied unchanged from r279232, head/sys/dev/netmap/if_ixl_netmap.h
Modified:
stable/10/sys/dev/ixl/if_ixl.c
stable/10/sys/dev/ixl/ixl_txrx.c
Directory Properties:
stable/10/ (props changed)
Modified: stable/10/sys/dev/ixl/if_ixl.c
==============================================================================
--- stable/10/sys/dev/ixl/if_ixl.c Fri Dec 11 12:20:58 2015 (r292095)
+++ stable/10/sys/dev/ixl/if_ixl.c Fri Dec 11 12:24:11 2015 (r292096)
@@ -212,6 +212,9 @@ DRIVER_MODULE(ixl, pci, ixl_driver, ixl_
MODULE_DEPEND(ixl, pci, 1, 1, 1);
MODULE_DEPEND(ixl, ether, 1, 1, 1);
+#ifdef DEV_NETMAP
+MODULE_DEPEND(ixl, netmap, 1, 1, 1);
+#endif /* DEV_NETMAP */
/*
** Global reset mutex
@@ -286,6 +289,10 @@ int ixl_atr_rate = 20;
TUNABLE_INT("hw.ixl.atr_rate", &ixl_atr_rate);
#endif
+#ifdef DEV_NETMAP
+#define NETMAP_IXL_MAIN /* only bring in one part of the netmap code */
+#include <dev/netmap/if_ixl_netmap.h>
+#endif /* DEV_NETMAP */
static char *ixl_fc_string[6] = {
"None",
@@ -646,6 +653,9 @@ ixl_attach(device_t dev)
ixl_unregister_vlan, vsi, EVENTHANDLER_PRI_FIRST);
+#ifdef DEV_NETMAP
+ ixl_netmap_attach(vsi);
+#endif /* DEV_NETMAP */
INIT_DEBUGOUT("ixl_attach: end");
return (0);
@@ -724,6 +734,9 @@ ixl_detach(device_t dev)
EVENTHANDLER_DEREGISTER(vlan_unconfig, vsi->vlan_detach);
callout_drain(&pf->timer);
+#ifdef DEV_NETMAP
+ netmap_detach(vsi->ifp);
+#endif /* DEV_NETMAP */
ixl_free_pci_resources(pf);
@@ -2661,6 +2674,15 @@ ixl_initialize_vsi(struct ixl_vsi *vsi)
break;
}
wr32(vsi->hw, I40E_QRX_TAIL(que->me), 0);
+#ifdef DEV_NETMAP
+ /* preserve queue */
+ if (vsi->ifp->if_capenable & IFCAP_NETMAP) {
+ struct netmap_adapter *na = NA(vsi->ifp);
+ struct netmap_kring *kring = &na->rx_rings[i];
+ int t = na->num_rx_desc - 1 - nm_kr_rxspace(kring);
+ wr32(vsi->hw, I40E_QRX_TAIL(que->me), t);
+ } else
+#endif /* DEV_NETMAP */
wr32(vsi->hw, I40E_QRX_TAIL(que->me), que->num_desc - 1);
}
return (err);
Modified: stable/10/sys/dev/ixl/ixl_txrx.c
==============================================================================
--- stable/10/sys/dev/ixl/ixl_txrx.c Fri Dec 11 12:20:58 2015 (r292095)
+++ stable/10/sys/dev/ixl/ixl_txrx.c Fri Dec 11 12:24:11 2015 (r292096)
@@ -61,6 +61,10 @@ static __inline void ixl_rx_discard(stru
static __inline void ixl_rx_input(struct rx_ring *, struct ifnet *,
struct mbuf *, u8);
+#ifdef DEV_NETMAP
+#include <dev/netmap/if_ixl_netmap.h>
+#endif /* DEV_NETMAP */
+
/*
** Multiqueue Transmit driver
**
@@ -485,9 +489,21 @@ ixl_init_tx_ring(struct ixl_queue *que)
{
struct tx_ring *txr = &que->txr;
struct ixl_tx_buf *buf;
+#ifdef DEV_NETMAP
+ struct netmap_adapter *na = NA(que->vsi->ifp);
+ struct netmap_slot *slot;
+#endif /* DEV_NETMAP */
/* Clear the old ring contents */
IXL_TX_LOCK(txr);
+#ifdef DEV_NETMAP
+ /*
+ * (under lock): if in netmap mode, do some consistency
+ * checks and set slot to entry 0 of the netmap ring.
+ */
+ slot = netmap_reset(na, NR_TX, que->me, 0);
+#endif /* DEV_NETMAP */
+
bzero((void *)txr->base,
(sizeof(struct i40e_tx_desc)) * que->num_desc);
@@ -511,6 +527,19 @@ ixl_init_tx_ring(struct ixl_queue *que)
m_freem(buf->m_head);
buf->m_head = NULL;
}
+#ifdef DEV_NETMAP
+ /*
+ * In netmap mode, set the map for the packet buffer.
+ * NOTE: Some drivers (not this one) also need to set
+ * the physical buffer address in the NIC ring.
+ * netmap_idx_n2k() maps a nic index, i, into the corresponding
+ * netmap slot index, si
+ */
+ if (slot) {
+ int si = netmap_idx_n2k(&na->tx_rings[que->me], i);
+ netmap_load_map(na, buf->tag, buf->map, NMB(na, slot + si));
+ }
+#endif /* DEV_NETMAP */
/* Clear the EOP index */
buf->eop_index = -1;
}
@@ -822,6 +851,11 @@ ixl_txeof(struct ixl_queue *que)
mtx_assert(&txr->mtx, MA_OWNED);
+#ifdef DEV_NETMAP
+ // XXX todo: implement moderation
+ if (netmap_tx_irq(que->vsi->ifp, que->me))
+ return FALSE;
+#endif /* DEF_NETMAP */
/* These are not the descriptors you seek, move along :) */
if (txr->avail == que->num_desc) {
@@ -1123,8 +1157,16 @@ ixl_init_rx_ring(struct ixl_queue *que)
struct ixl_rx_buf *buf;
bus_dma_segment_t pseg[1], hseg[1];
int rsize, nsegs, error = 0;
+#ifdef DEV_NETMAP
+ struct netmap_adapter *na = NA(que->vsi->ifp);
+ struct netmap_slot *slot;
+#endif /* DEV_NETMAP */
IXL_RX_LOCK(rxr);
+#ifdef DEV_NETMAP
+ /* same as in ixl_init_tx_ring() */
+ slot = netmap_reset(na, NR_RX, que->me, 0);
+#endif /* DEV_NETMAP */
/* Clear the ring contents */
rsize = roundup2(que->num_desc *
sizeof(union i40e_rx_desc), DBA_ALIGN);
@@ -1158,6 +1200,28 @@ ixl_init_rx_ring(struct ixl_queue *que)
struct mbuf *mh, *mp;
buf = &rxr->buffers[j];
+#ifdef DEV_NETMAP
+ /*
+ * In netmap mode, fill the map and set the buffer
+ * address in the NIC ring, considering the offset
+ * between the netmap and NIC rings (see comment in
+ * ixgbe_setup_transmit_ring() ). No need to allocate
+ * an mbuf, so end the block with a continue;
+ */
+ if (slot) {
+ int sj = netmap_idx_n2k(&na->rx_rings[que->me], j);
+ uint64_t paddr;
+ void *addr;
+
+ addr = PNMB(na, slot + sj, &paddr);
+ netmap_load_map(na, rxr->dma.tag, buf->pmap, addr);
+ /* Update descriptor and the cached value */
+ rxr->base[j].read.pkt_addr = htole64(paddr);
+ rxr->base[j].read.hdr_addr = 0;
+ continue;
+ }
+#endif /* DEV_NETMAP */
+
/*
** Don't allocate mbufs if not
** doing header split, its wasteful
@@ -1457,6 +1521,12 @@ ixl_rxeof(struct ixl_queue *que, int cou
IXL_RX_LOCK(rxr);
+#ifdef DEV_NETMAP
+ if (netmap_rx_irq(ifp, que->me, &count)) {
+ IXL_RX_UNLOCK(rxr);
+ return (FALSE);
+ }
+#endif /* DEV_NETMAP */
for (i = rxr->next_check; count != 0;) {
struct mbuf *sendmp, *mh, *mp;
Copied: stable/10/sys/dev/netmap/if_ixl_netmap.h (from r279232, head/sys/dev/netmap/if_ixl_netmap.h)
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ stable/10/sys/dev/netmap/if_ixl_netmap.h Fri Dec 11 12:24:11 2015 (r292096, copy of r279232, head/sys/dev/netmap/if_ixl_netmap.h)
@@ -0,0 +1,422 @@
+/*
+ * Copyright (C) 2015, 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.
+ */
+
+/*
+ * $FreeBSD$
+ *
+ * netmap support for: ixl
+ *
+ * derived from ixgbe
+ * netmap support for a network driver.
+ * This file contains code but only static or inline functions used
+ * by a single driver. To avoid replication of code we just #include
+ * it near the beginning of the standard driver.
+ * For ixl the file is imported in two places, hence the conditional at the
+ * beginning.
+ */
+
+#include <net/netmap.h>
+#include <sys/selinfo.h>
+
+/*
+ * Some drivers may need the following headers. Others
+ * already include them by default
+
+#include <vm/vm.h>
+#include <vm/pmap.h>
+
+ */
+#include <dev/netmap/netmap_kern.h>
+
+int ixl_netmap_txsync(struct netmap_kring *kring, int flags);
+int ixl_netmap_rxsync(struct netmap_kring *kring, int flags);
+
+extern int ixl_rx_miss, ixl_rx_miss_bufs, ixl_crcstrip;
+
+#ifdef NETMAP_IXL_MAIN
+/*
+ * device-specific sysctl variables:
+ *
+ * ixl_crcstrip: 0: keep CRC in rx frames (default), 1: strip it.
+ * During regular operations the CRC is stripped, but on some
+ * hardware reception of frames not multiple of 64 is slower,
+ * so using crcstrip=0 helps in benchmarks.
+ *
+ * ixl_rx_miss, ixl_rx_miss_bufs:
+ * count packets that might be missed due to lost interrupts.
+ */
+SYSCTL_DECL(_dev_netmap);
+int ixl_rx_miss, ixl_rx_miss_bufs, ixl_crcstrip;
+SYSCTL_INT(_dev_netmap, OID_AUTO, ixl_crcstrip,
+ CTLFLAG_RW, &ixl_crcstrip, 0, "strip CRC on rx frames");
+SYSCTL_INT(_dev_netmap, OID_AUTO, ixl_rx_miss,
+ CTLFLAG_RW, &ixl_rx_miss, 0, "potentially missed rx intr");
+SYSCTL_INT(_dev_netmap, OID_AUTO, ixl_rx_miss_bufs,
+ CTLFLAG_RW, &ixl_rx_miss_bufs, 0, "potentially missed rx intr bufs");
+
+
+/*
+ * Register/unregister. We are already under netmap lock.
+ * Only called on the first register or the last unregister.
+ */
+static int
+ixl_netmap_reg(struct netmap_adapter *na, int onoff)
+{
+ struct ifnet *ifp = na->ifp;
+ struct ixl_vsi *vsi = ifp->if_softc;
+ struct ixl_pf *pf = (struct ixl_pf *)vsi->back;
+
+ IXL_PF_LOCK(pf);
+ ixl_disable_intr(vsi);
+
+ /* Tell the stack that the interface is no longer active */
+ ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | IFF_DRV_OACTIVE);
+
+ //set_crcstrip(&adapter->hw, onoff);
+ /* enable or disable flags and callbacks in na and ifp */
+ if (onoff) {
+ nm_set_native_flags(na);
+ } else {
+ nm_clear_native_flags(na);
+ }
+ ixl_init_locked(pf); /* also enables intr */
+ //set_crcstrip(&adapter->hw, onoff); // XXX why twice ?
+ IXL_PF_UNLOCK(pf);
+ return (ifp->if_drv_flags & IFF_DRV_RUNNING ? 0 : 1);
+}
+
+
+/*
+ * The attach routine, called near the end of ixl_attach(),
+ * fills the parameters for netmap_attach() and calls it.
+ * It cannot fail, in the worst case (such as no memory)
+ * netmap mode will be disabled and the driver will only
+ * operate in standard mode.
+ */
+static void
+ixl_netmap_attach(struct ixl_vsi *vsi)
+{
+ struct netmap_adapter na;
+
+ bzero(&na, sizeof(na));
+
+ na.ifp = vsi->ifp;
+ na.na_flags = NAF_BDG_MAYSLEEP;
+ // XXX check that queues is set.
+ printf("queues is %p\n", vsi->queues);
+ if (vsi->queues) {
+ na.num_tx_desc = vsi->queues[0].num_desc;
+ na.num_rx_desc = vsi->queues[0].num_desc;
+ }
+ na.nm_txsync = ixl_netmap_txsync;
+ na.nm_rxsync = ixl_netmap_rxsync;
+ na.nm_register = ixl_netmap_reg;
+ na.num_tx_rings = na.num_rx_rings = vsi->num_queues;
+ netmap_attach(&na);
+}
+
+
+#else /* !NETMAP_IXL_MAIN, code for ixl_txrx.c */
+
+/*
+ * Reconcile kernel and user view of the transmit ring.
+ *
+ * All information is in the kring.
+ * Userspace wants to send packets up to the one before kring->rhead,
+ * kernel knows kring->nr_hwcur is the first unsent packet.
+ *
+ * Here we push packets out (as many as possible), and possibly
+ * reclaim buffers from previously completed transmission.
+ *
+ * The caller (netmap) guarantees that there is only one instance
+ * running at any time. Any interference with other driver
+ * methods should be handled by the individual drivers.
+ */
+int
+ixl_netmap_txsync(struct netmap_kring *kring, int flags)
+{
+ struct netmap_adapter *na = kring->na;
+ struct ifnet *ifp = na->ifp;
+ struct netmap_ring *ring = kring->ring;
+ u_int nm_i; /* index into the netmap ring */
+ u_int nic_i; /* index into the NIC ring */
+ u_int n;
+ u_int const lim = kring->nkr_num_slots - 1;
+ u_int const head = kring->rhead;
+ /*
+ * interrupts on every tx packet are expensive so request
+ * them every half ring, or where NS_REPORT is set
+ */
+ u_int report_frequency = kring->nkr_num_slots >> 1;
+
+ /* device-specific */
+ struct ixl_vsi *vsi = ifp->if_softc;
+ struct ixl_queue *que = &vsi->queues[kring->ring_id];
+ struct tx_ring *txr = &que->txr;
+
+ bus_dmamap_sync(txr->dma.tag, txr->dma.map,
+ BUS_DMASYNC_POSTREAD);
+
+ /*
+ * First part: process new packets to send.
+ * nm_i is the current index in the netmap ring,
+ * nic_i is the corresponding index in the NIC ring.
+ *
+ * If we have packets to send (nm_i != head)
+ * iterate over the netmap ring, fetch length and update
+ * the corresponding slot in the NIC ring. Some drivers also
+ * need to update the buffer's physical address in the NIC slot
+ * even NS_BUF_CHANGED is not set (PNMB computes the addresses).
+ *
+ * The netmap_reload_map() calls is especially expensive,
+ * even when (as in this case) the tag is 0, so do only
+ * when the buffer has actually changed.
+ *
+ * If possible do not set the report/intr bit on all slots,
+ * but only a few times per ring or when NS_REPORT is set.
+ *
+ * Finally, on 10G and faster drivers, it might be useful
+ * to prefetch the next slot and txr entry.
+ */
+
+ nm_i = kring->nr_hwcur;
+ if (nm_i != head) { /* we have new packets to send */
+ nic_i = netmap_idx_k2n(kring, nm_i);
+
+ __builtin_prefetch(&ring->slot[nm_i]);
+ __builtin_prefetch(&txr->buffers[nic_i]);
+
+ for (n = 0; nm_i != head; n++) {
+ struct netmap_slot *slot = &ring->slot[nm_i];
+ u_int len = slot->len;
+ uint64_t paddr;
+ void *addr = PNMB(na, slot, &paddr);
+
+ /* device-specific */
+ struct i40e_tx_desc *curr = &txr->base[nic_i];
+ struct ixl_tx_buf *txbuf = &txr->buffers[nic_i];
+ u64 flags = (slot->flags & NS_REPORT ||
+ nic_i == 0 || nic_i == report_frequency) ?
+ ((u64)I40E_TX_DESC_CMD_RS << I40E_TXD_QW1_CMD_SHIFT) : 0;
+
+ /* prefetch for next round */
+ __builtin_prefetch(&ring->slot[nm_i + 1]);
+ __builtin_prefetch(&txr->buffers[nic_i + 1]);
+
+ NM_CHECK_ADDR_LEN(na, addr, len);
+
+ if (slot->flags & NS_BUF_CHANGED) {
+ /* buffer has changed, reload map */
+ netmap_reload_map(na, txr->dma.tag, txbuf->map, addr);
+ }
+ slot->flags &= ~(NS_REPORT | NS_BUF_CHANGED);
+
+ /* Fill the slot in the NIC ring. */
+ curr->buffer_addr = htole64(paddr);
+ curr->cmd_type_offset_bsz = htole64(
+ ((u64)len << I40E_TXD_QW1_TX_BUF_SZ_SHIFT) |
+ flags |
+ ((u64)I40E_TX_DESC_CMD_EOP << I40E_TXD_QW1_CMD_SHIFT)
+ ); // XXX more ?
+
+ /* make sure changes to the buffer are synced */
+ bus_dmamap_sync(txr->dma.tag, txbuf->map,
+ BUS_DMASYNC_PREWRITE);
+
+ nm_i = nm_next(nm_i, lim);
+ nic_i = nm_next(nic_i, lim);
+ }
+ kring->nr_hwcur = head;
+
+ /* synchronize the NIC ring */
+ bus_dmamap_sync(txr->dma.tag, txr->dma.map,
+ BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
+
+ /* (re)start the tx unit up to slot nic_i (excluded) */
+ wr32(vsi->hw, txr->tail, nic_i);
+ }
+
+ /*
+ * Second part: reclaim buffers for completed transmissions.
+ */
+ nic_i = LE32_TO_CPU(*(volatile __le32 *)&txr->base[que->num_desc]);
+ if (nic_i != txr->next_to_clean) {
+ /* some tx completed, increment avail */
+ txr->next_to_clean = nic_i;
+ kring->nr_hwtail = nm_prev(netmap_idx_n2k(kring, nic_i), lim);
+ }
+
+ nm_txsync_finalize(kring);
+
+ return 0;
+}
+
+
+/*
+ * Reconcile kernel and user view of the receive ring.
+ * Same as for the txsync, this routine must be efficient.
+ * The caller guarantees a single invocations, but races against
+ * the rest of the driver should be handled here.
+ *
+ * On call, kring->rhead is the first packet that userspace wants
+ * to keep, and kring->rcur is the wakeup point.
+ * The kernel has previously reported packets up to kring->rtail.
+ *
+ * If (flags & NAF_FORCE_READ) also check for incoming packets irrespective
+ * of whether or not we received an interrupt.
+ */
+int
+ixl_netmap_rxsync(struct netmap_kring *kring, int flags)
+{
+ struct netmap_adapter *na = kring->na;
+ struct ifnet *ifp = na->ifp;
+ struct netmap_ring *ring = kring->ring;
+ u_int nm_i; /* index into the netmap ring */
+ u_int nic_i; /* index into the NIC ring */
+ u_int n;
+ u_int const lim = kring->nkr_num_slots - 1;
+ u_int const head = nm_rxsync_prologue(kring);
+ int force_update = (flags & NAF_FORCE_READ) || kring->nr_kflags & NKR_PENDINTR;
+
+ /* device-specific */
+ struct ixl_vsi *vsi = ifp->if_softc;
+ struct ixl_queue *que = &vsi->queues[kring->ring_id];
+ struct rx_ring *rxr = &que->rxr;
+
+ if (head > lim)
+ return netmap_ring_reinit(kring);
+
+ /* XXX check sync modes */
+ bus_dmamap_sync(rxr->dma.tag, rxr->dma.map,
+ BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
+
+ /*
+ * First part: import newly received packets.
+ *
+ * nm_i is the index of the next free slot in the netmap ring,
+ * nic_i is the index of the next received packet in the NIC ring,
+ * and they may differ in case if_init() has been called while
+ * in netmap mode. For the receive ring we have
+ *
+ * nic_i = rxr->next_check;
+ * nm_i = kring->nr_hwtail (previous)
+ * and
+ * nm_i == (nic_i + kring->nkr_hwofs) % ring_size
+ *
+ * rxr->next_check is set to 0 on a ring reinit
+ */
+ if (netmap_no_pendintr || force_update) {
+ int crclen = ixl_crcstrip ? 0 : 4;
+ uint16_t slot_flags = kring->nkr_slot_flags;
+
+ nic_i = rxr->next_check; // or also k2n(kring->nr_hwtail)
+ nm_i = netmap_idx_n2k(kring, nic_i);
+
+ for (n = 0; ; n++) {
+ union i40e_32byte_rx_desc *curr = &rxr->base[nic_i];
+ uint64_t qword = le64toh(curr->wb.qword1.status_error_len);
+ uint32_t staterr = (qword & I40E_RXD_QW1_STATUS_MASK)
+ >> I40E_RXD_QW1_STATUS_SHIFT;
+
+ if ((staterr & (1<<I40E_RX_DESC_STATUS_DD_SHIFT)) == 0)
+ break;
+ ring->slot[nm_i].len = ((qword & I40E_RXD_QW1_LENGTH_PBUF_MASK)
+ >> I40E_RXD_QW1_LENGTH_PBUF_SHIFT) - crclen;
+ ring->slot[nm_i].flags = slot_flags;
+ bus_dmamap_sync(rxr->ptag,
+ rxr->buffers[nic_i].pmap, BUS_DMASYNC_POSTREAD);
+ nm_i = nm_next(nm_i, lim);
+ nic_i = nm_next(nic_i, lim);
+ }
+ if (n) { /* update the state variables */
+ if (netmap_no_pendintr && !force_update) {
+ /* diagnostics */
+ ixl_rx_miss ++;
+ ixl_rx_miss_bufs += n;
+ }
+ rxr->next_check = nic_i;
+ kring->nr_hwtail = nm_i;
+ }
+ kring->nr_kflags &= ~NKR_PENDINTR;
+ }
+
+ /*
+ * Second part: skip past packets that userspace has released.
+ * (kring->nr_hwcur to head excluded),
+ * and make the buffers available for reception.
+ * As usual nm_i is the index in the netmap ring,
+ * nic_i is the index in the NIC ring, and
+ * nm_i == (nic_i + kring->nkr_hwofs) % ring_size
+ */
+ nm_i = kring->nr_hwcur;
+ if (nm_i != head) {
+ nic_i = netmap_idx_k2n(kring, nm_i);
+ for (n = 0; nm_i != head; n++) {
+ struct netmap_slot *slot = &ring->slot[nm_i];
+ uint64_t paddr;
+ void *addr = PNMB(na, slot, &paddr);
+
+ union i40e_32byte_rx_desc *curr = &rxr->base[nic_i];
+ struct ixl_rx_buf *rxbuf = &rxr->buffers[nic_i];
+
+ if (addr == NETMAP_BUF_BASE(na)) /* bad buf */
+ goto ring_reset;
+
+ if (slot->flags & NS_BUF_CHANGED) {
+ /* buffer has changed, reload map */
+ netmap_reload_map(na, rxr->ptag, rxbuf->pmap, addr);
+ slot->flags &= ~NS_BUF_CHANGED;
+ }
+ curr->read.pkt_addr = htole64(paddr);
+ curr->read.hdr_addr = 0; // XXX needed
+ bus_dmamap_sync(rxr->ptag, rxbuf->pmap,
+ BUS_DMASYNC_PREREAD);
+ nm_i = nm_next(nm_i, lim);
+ nic_i = nm_next(nic_i, lim);
+ }
+ kring->nr_hwcur = head;
+
+ bus_dmamap_sync(rxr->dma.tag, rxr->dma.map,
+ BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
+ /*
+ * IMPORTANT: we must leave one free slot in the ring,
+ * so move nic_i back by one unit
+ */
+ nic_i = nm_prev(nic_i, lim);
+ wr32(vsi->hw, rxr->tail, nic_i);
+ }
+
+ /* tell userspace that there might be new packets */
+ nm_rxsync_finalize(kring);
+
+ return 0;
+
+ring_reset:
+ return netmap_ring_reinit(kring);
+}
+
+#endif /* !NETMAP_IXL_MAIN */
+
+/* end of file */
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