The MTU is assigned to the tap netdevice according to the argument, but
packet transmission and reception just write/read on an fd with the
default limit being the socket buffer size.
Signed-off-by: Pascal Mazon <pascal.ma...@6wind.com>
---
doc/guides/nics/features/tap.ini | 1 +
drivers/net/tap/rte_eth_tap.c | 37 +++++++++++++++++++++++++++++++++++++
2 files changed, 38 insertions(+)
diff --git a/doc/guides/nics/features/tap.ini b/doc/guides/nics/features/tap.ini
index 6878a9b8fd17..6aa11874e2bc 100644
--- a/doc/guides/nics/features/tap.ini
+++ b/doc/guides/nics/features/tap.ini
@@ -9,6 +9,7 @@ Jumbo frame = Y
Promiscuous mode = Y
Allmulticast mode = Y
Basic stats = Y
+MTU update = Y
Multicast MAC filter = Y
Speed capabilities = Y
Unicast MAC filter = Y
diff --git a/drivers/net/tap/rte_eth_tap.c b/drivers/net/tap/rte_eth_tap.c
index 131c09fbc1a5..64b84cd76321 100644
--- a/drivers/net/tap/rte_eth_tap.c
+++ b/drivers/net/tap/rte_eth_tap.c
@@ -724,6 +724,42 @@ tap_set_mc_addr_list(struct rte_eth_dev *dev __rte_unused,
return 0;
}
+static int
+tap_mtu_set(struct rte_eth_dev *dev, uint16_t mtu)
+{
+ struct pmd_internals *pmd = dev->data->dev_private;
+ struct ifreq ifr;
+ int err, s;
+
+ s = socket(AF_INET, SOCK_DGRAM, 0);
+ if (s < 0) {
+ RTE_LOG(ERR, PMD,
+ "Unable to get a socket for %s to set flags: %s\n",
+ pmd->name, strerror(errno));
+ return -1;
+ }
+ memset(&ifr, 0, sizeof(ifr));
+ strncpy(ifr.ifr_name, pmd->name, IFNAMSIZ);
+ err = ioctl(s, SIOCGIFMTU, &ifr);
+ if (err < 0) {
+ RTE_LOG(WARNING, PMD, "Unable to get %s device MTU: %s\n",
+ pmd->name, strerror(errno));
+ close(s);
+ return -1;
+ }
+ ifr.ifr_mtu = mtu;
+ err = ioctl(s, SIOCSIFMTU, &ifr);
+ if (err < 0) {
+ RTE_LOG(WARNING, PMD, "Unable to set %s mtu %d: %s\n",
+ pmd->name, mtu, strerror(errno));
+ close(s);
+ return -1;
+ }
+ close(s);
+ dev->data->mtu = mtu;
+ return 0;
+}
+
static const struct eth_dev_ops ops = {
.dev_start = tap_dev_start,
.dev_stop = tap_dev_stop,
@@ -745,6 +781,7 @@ static const struct eth_dev_ops ops = {
.mac_addr_add = tap_mac_add,
.mac_addr_set = tap_mac_set,
.set_mc_addr_list = tap_set_mc_addr_list,
+ .mtu_set = tap_mtu_set,
.stats_get = tap_stats_get,
.stats_reset = tap_stats_reset,
};
--
2.8.0.rc0
