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/*
* 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: release/9.1.0/sys/dev/netmap/if_em_netmap.h 235549 2012-05-17 15:02:51Z luigi $
* $Id: if_em_netmap.h 10627 2012-02-23 19:37:15Z luigi $
*
* netmap support for em.
*
* For more details on netmap support please see ixgbe_netmap.h
*/
#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 void
em_netmap_lock_wrapper(struct ifnet *ifp, int what, u_int queueid)
{
struct adapter *adapter = ifp->if_softc;
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;
}
}
// XXX do we need to block/unblock the tasks ?
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;
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:
/* return to non-netmap mode */
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 kernel and user view of the transmit ring.
*/
static int
em_netmap_txsync(struct ifnet *ifp, u_int ring_nr, int do_lock)
{
struct adapter *adapter = ifp->if_softc;
struct tx_ring *txr = &adapter->tx_rings[ring_nr];
struct netmap_adapter *na = NA(ifp);
struct netmap_kring *kring = &na->tx_rings[ring_nr];
struct netmap_ring *ring = kring->ring;
u_int j, k, l, n = 0, 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 (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);
/*
* Process new packets to send. j is the current index in the
* netmap ring, l is the corresponding index in the NIC ring.
*/
j = kring->nr_hwcur;
if (j != k) { /* we have new packets to send */
l = netmap_idx_k2n(kring, j);
for (n = 0; j != k; n++) {
/* slot is the current slot in the netmap ring */
struct netmap_slot *slot = &ring->slot[j];
/* curr is the current slot in the nic ring */
struct e1000_tx_desc *curr = &txr->tx_base[l];
struct em_buffer *txbuf = &txr->tx_buffers[l];
int flags = ((slot->flags & NS_REPORT) ||
j == 0 || j == report_frequency) ?
E1000_TXD_CMD_RS : 0;
uint64_t paddr;
void *addr = PNMB(slot, &paddr);
u_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;
if (slot->flags & NS_BUF_CHANGED) {
curr->buffer_addr = htole64(paddr);
/* buffer has changed, reload map */
netmap_reload_map(txr->txtag, txbuf->map, addr);
slot->flags &= ~NS_BUF_CHANGED;
}
curr->upper.data = 0;
curr->lower.data = htole32(adapter->txd_cmd | len |
(E1000_TXD_CMD_EOP | flags) );
bus_dmamap_sync(txr->txtag, txbuf->map,
BUS_DMASYNC_PREWRITE);
j = (j == lim) ? 0 : j + 1;
l = (l == lim) ? 0 : l + 1;
}
kring->nr_hwcur = k; /* the saved ring->cur */
kring->nr_hwavail -= n;
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), l);
}
if (n == 0 || kring->nr_hwavail < 1) {
int delta;
/* record completed transmissions using TDH */
l = E1000_READ_REG(&adapter->hw, E1000_TDH(ring_nr));
if (l >= kring->nkr_num_slots) { /* XXX can it happen ? */
D("TDH wrap %d", l);
l -= kring->nkr_num_slots;
}
delta = l - txr->next_to_clean;
if (delta) {
/* some completed, increment hwavail. */
if (delta < 0)
delta += kring->nkr_num_slots;
txr->next_to_clean = l;
kring->nr_hwavail += delta;
}
}
/* update avail to what the kernel knows */
ring->avail = kring->nr_hwavail;
if (do_lock)
EM_TX_UNLOCK(txr);
return 0;
}
/*
* Reconcile kernel and user view of the receive ring.
*/
static int
em_netmap_rxsync(struct ifnet *ifp, u_int ring_nr, int do_lock)
{
struct adapter *adapter = ifp->if_softc;
struct rx_ring *rxr = &adapter->rx_rings[ring_nr];
struct netmap_adapter *na = NA(ifp);
struct netmap_kring *kring = &na->rx_rings[ring_nr];
struct netmap_ring *ring = kring->ring;
u_int j, l, n, lim = kring->nkr_num_slots - 1;
int force_update = do_lock || kring->nr_kflags & NKR_PENDINTR;
u_int k = ring->cur, resvd = ring->reserved;
k = ring->cur;
if (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);
/*
* Import newly received packets into the netmap ring.
* j is an index in the netmap ring, l in the NIC ring.
*/
l = rxr->next_to_check;
j = netmap_idx_n2k(kring, l);
if (netmap_no_pendintr || force_update) {
for (n = 0; ; n++) {
struct e1000_rx_desc *curr = &rxr->rx_base[l];
uint32_t staterr = le32toh(curr->status);
if ((staterr & E1000_RXD_STAT_DD) == 0)
break;
ring->slot[j].len = le16toh(curr->length);
bus_dmamap_sync(rxr->rxtag, rxr->rx_buffers[l].map,
BUS_DMASYNC_POSTREAD);
j = (j == lim) ? 0 : j + 1;
/* make sure next_to_refresh follows next_to_check */
rxr->next_to_refresh = l; // XXX
l = (l == lim) ? 0 : l + 1;
}
if (n) { /* update the state variables */
rxr->next_to_check = l;
kring->nr_hwavail += n;
}
kring->nr_kflags &= ~NKR_PENDINTR;
}
/* skip past packets that userspace has released */
j = kring->nr_hwcur; /* netmap ring index */
if (resvd > 0) {
if (resvd + ring->avail >= lim + 1) {
D("XXX invalid reserve/avail %d %d", resvd, ring->avail);
ring->reserved = resvd = 0; // XXX panic...
}
k = (k >= resvd) ? k - resvd : k + lim + 1 - resvd;
}
if (j != k) { /* userspace has released some packets. */
l = netmap_idx_k2n(kring, j); /* NIC ring index */
for (n = 0; j != k; n++) {
struct netmap_slot *slot = &ring->slot[j];
struct e1000_rx_desc *curr = &rxr->rx_base[l];
struct em_buffer *rxbuf = &rxr->rx_buffers[l];
uint64_t paddr;
void *addr = PNMB(slot, &paddr);
if (addr == netmap_buffer_base) { /* bad buf */
if (do_lock)
EM_RX_UNLOCK(rxr);
return netmap_ring_reinit(kring);
}
if (slot->flags & NS_BUF_CHANGED) {
curr->buffer_addr = htole64(paddr);
/* buffer has changed, reload map */
netmap_reload_map(rxr->rxtag, rxbuf->map, addr);
slot->flags &= ~NS_BUF_CHANGED;
}
curr->status = 0;
bus_dmamap_sync(rxr->rxtag, rxbuf->map,
BUS_DMASYNC_PREREAD);
j = (j == lim) ? 0 : j + 1;
l = (l == lim) ? 0 : l + 1;
}
kring->nr_hwavail -= n;
kring->nr_hwcur = k;
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 l back by one unit
*/
l = (l == 0) ? lim : l - 1;
E1000_WRITE_REG(&adapter->hw, E1000_RDT(rxr->me), l);
}
/* tell userspace that there are new packets */
ring->avail = kring->nr_hwavail - resvd;
if (do_lock)
EM_RX_UNLOCK(rxr);
return 0;
}
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;
netmap_attach(&na, adapter->num_queues);
}
/* end of file */