[dpdk-dev] [PATCH] net/tap: do not send packets larger than MTU
Pascal Mazon
pascal.mazon at 6wind.com
Wed Mar 15 16:09:08 CET 2017
Signed-off-by: Pascal Mazon <pascal.mazon at 6wind.com>
---
drivers/net/tap/rte_eth_tap.c | 6 ++++++
drivers/net/tap/rte_eth_tap.h | 1 +
2 files changed, 7 insertions(+)
diff --git a/drivers/net/tap/rte_eth_tap.c b/drivers/net/tap/rte_eth_tap.c
index 69fa282ca176..17496501e6ba 100644
--- a/drivers/net/tap/rte_eth_tap.c
+++ b/drivers/net/tap/rte_eth_tap.c
@@ -340,14 +340,19 @@ pmd_tx_burst(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
struct tx_queue *txq = queue;
uint16_t num_tx = 0;
unsigned long num_tx_bytes = 0;
+ uint32_t max_size;
int i, n;
if (unlikely(nb_pkts == 0))
return 0;
+ max_size = *txq->mtu + (ETHER_HDR_LEN + ETHER_CRC_LEN + 4);
for (i = 0; i < nb_pkts; i++) {
/* copy the tx frame data */
mbuf = bufs[num_tx];
+ /* stats.errs will be incremented */
+ if (rte_pktmbuf_pkt_len(mbuf) > max_size)
+ break;
n = write(txq->fd,
rte_pktmbuf_mtod(mbuf, void *),
rte_pktmbuf_pkt_len(mbuf));
@@ -707,6 +712,7 @@ tap_setup_queue(struct rte_eth_dev *dev,
rx->fd = fd;
tx->fd = fd;
+ tx->mtu = &dev->data->mtu;
return fd;
}
diff --git a/drivers/net/tap/rte_eth_tap.h b/drivers/net/tap/rte_eth_tap.h
index 1ad6ad88796a..9546411bd790 100644
--- a/drivers/net/tap/rte_eth_tap.h
+++ b/drivers/net/tap/rte_eth_tap.h
@@ -60,6 +60,7 @@ struct rx_queue {
struct tx_queue {
int fd;
+ uint16_t *mtu; /* Pointer to MTU from dev_data */
struct pkt_stats stats; /* Stats for this TX queue */
};
--
2.8.0.rc0
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