From: Pascal Mazon <pascal.mazon@6wind.com>
Date: Wed, 15 Mar 2017 15:09:08 +0000 (+0100)
Subject: net/tap: do not send packets larger than MTU
X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=5025409c0482e9445da42b50826a84af5274814b;p=dpdk.git

net/tap: do not send packets larger than MTU

Signed-off-by: Pascal Mazon <pascal.mazon@6wind.com>
Acked-by: Keith Wiles <keith.wiles@intel.com>
---

diff --git a/drivers/net/tap/rte_eth_tap.c b/drivers/net/tap/rte_eth_tap.c
index c711b36c32..3345c1a2e2 100644
--- a/drivers/net/tap/rte_eth_tap.c
+++ b/drivers/net/tap/rte_eth_tap.c
@@ -305,14 +305,19 @@ 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));
@@ -646,6 +651,7 @@ 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 741ec53508..deb594c8f6 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 */
 };