64ae02c365
USERSPACE: 1. add support for devices with different number of rx and tx queues; 2. add better support for zero-copy operation, adding an extra field to the netmap ring to indicate how many buffers we have already processed but not yet released (with help from Eddie Kohler); 3. The two changes above unfortunately require an API change, so while at it add a version field and some spares to the ioctl() argument to help detect mismatches. 4. update the manual page for the two changes above; 5. update sample applications in tools/tools/netmap KERNEL: 1. simplify the internal structures moving the global wait queues to the 'struct netmap_adapter'; 2. simplify the functions that map kring<->nic ring indexes 3. normalize device-specific code, helps mainteinance; 4. start exploring the impact of micro-optimizations (prefetch etc.) in the ixgbe driver. Use 'legacy' descriptors on the tx ring and prefetch slots gives about 20% speedup at 900 MHz. Another 7-10% would come from removing the explict calls to bus_dmamap* in the core (they are effectively NOPs in this case, but it takes expensive load of the per-buffer dma maps to figure out that they are all NULL. Rx performance not investigated. I am postponing the MFC so i can import a few more improvements before merging.
390 lines
11 KiB
C
390 lines
11 KiB
C
/*
|
|
* 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 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 */
|