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net/tap: fix support for large Rx queues

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Rx queues configured with more than 1023 descriptors cause readv() calls to
fail due to more iovec entries than permitted by the kernel. As a result,
no packets can be received.

Quietly limit internal Rx queue size to the maximum number of iovec entries
to fix this issue.

Fixes: 0781f5762c ("net/tap: support segmented mbufs")

Signed-off-by: Pascal Mazon <pascal.mazon@6wind.com>
This commit is contained in:
Pascal Mazon 2017-04-27 15:51:42 +02:00 committed by Thomas Monjalon
parent b31eb10546
commit ec12df9504
1 changed files with 6 additions and 4 deletions
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10
drivers/net/tap/rte_eth_tap.c
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@ -875,7 +875,9 @@ tap_rx_queue_setup(struct rte_eth_dev *dev,
struct pmd_internals *internals = dev->data->dev_private;
struct rx_queue *rxq = &internals->rxq[rx_queue_id];
struct rte_mbuf **tmp = &rxq->pool;
struct iovec (*iovecs)[nb_rx_desc + 1];
long iov_max = sysconf(_SC_IOV_MAX);
uint16_t nb_desc = RTE_MIN(nb_rx_desc, iov_max - 1);
struct iovec (*iovecs)[nb_desc + 1];
int data_off = RTE_PKTMBUF_HEADROOM;
int ret = 0;
int fd;
@ -891,13 +893,13 @@ tap_rx_queue_setup(struct rte_eth_dev *dev,
rxq->mp = mp;
rxq->trigger_seen = 1; /* force initial burst */
rxq->in_port = dev->data->port_id;
rxq->nb_rx_desc = nb_rx_desc;
rxq->nb_rx_desc = nb_desc;
iovecs = rte_zmalloc_socket(dev->data->name, sizeof(*iovecs), 0,
socket_id);
if (!iovecs) {
RTE_LOG(WARNING, PMD,
"%s: Couldn't allocate %d RX descriptors\n",
dev->data->name, nb_rx_desc);
dev->data->name, nb_desc);
return -ENOMEM;
}
rxq->iovecs = iovecs;
@ -911,7 +913,7 @@ tap_rx_queue_setup(struct rte_eth_dev *dev,
(*rxq->iovecs)[0].iov_len = sizeof(struct tun_pi);
(*rxq->iovecs)[0].iov_base = &rxq->pi;
for (i = 1; i <= nb_rx_desc; i++) {
for (i = 1; i <= nb_desc; i++) {
*tmp = rte_pktmbuf_alloc(rxq->mp);
if (!*tmp) {
RTE_LOG(WARNING, PMD,