[dpdk-dev] [PATCH v2 4/4] net/tap: set MTU on the remote

[Pascal Mazon]

Signed-off-by: Pascal Mazon <pascal.ma...@6wind.com>
---
 drivers/net/tap/rte_eth_tap.c | 29 +++++++++++++++++++++++------
 1 file changed, 23 insertions(+), 6 deletions(-)

diff --git a/drivers/net/tap/rte_eth_tap.c b/drivers/net/tap/rte_eth_tap.c
index ed71cddfe0b3..34e56813cedb 100644
--- a/drivers/net/tap/rte_eth_tap.c
+++ b/drivers/net/tap/rte_eth_tap.c
@@ -839,9 +839,8 @@ tap_set_mc_addr_list(struct rte_eth_dev *dev __rte_unused,
 }
 
 static int
-tap_mtu_set(struct rte_eth_dev *dev, uint16_t mtu)
+tap_netdev_mtu_set(const char *iface, uint16_t mtu)
 {
-       struct pmd_internals *pmd = dev->data->dev_private;
        struct ifreq ifr;
        int err, s;
 
@@ -849,15 +848,15 @@ tap_mtu_set(struct rte_eth_dev *dev, uint16_t mtu)
        if (s < 0) {
                RTE_LOG(ERR, PMD,
                        "Unable to get a socket for %s to set flags: %s\n",
-                       pmd->name, strerror(errno));
+                       iface, strerror(errno));
                return -1;
        }
        memset(&ifr, 0, sizeof(ifr));
-       snprintf(ifr.ifr_name, IFNAMSIZ, "%s", pmd->name);
+       snprintf(ifr.ifr_name, IFNAMSIZ, "%s", iface);
        err = ioctl(s, SIOCGIFMTU, &ifr);
        if (err < 0) {
                RTE_LOG(WARNING, PMD, "Unable to get %s device MTU: %s\n",
-                       pmd->name, strerror(errno));
+                       iface, strerror(errno));
                close(s);
                return -1;
        }
@@ -865,11 +864,29 @@ tap_mtu_set(struct rte_eth_dev *dev, uint16_t 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));
+                       iface, mtu, strerror(errno));
                close(s);
                return -1;
        }
        close(s);
+       return 0;
+}
+
+static int
+tap_mtu_set(struct rte_eth_dev *dev, uint16_t mtu)
+{
+       struct pmd_internals *pmd = dev->data->dev_private;
+       int err;
+
+       /* First try to set mtu on the remote */
+       if (pmd->remote_if_index) {
+               err = tap_netdev_mtu_set(pmd->remote_iface, mtu);
+               if (err < 0)
+                       return err;
+       }
+       err = tap_netdev_mtu_set(pmd->name, mtu);
+       if (err < 0)
+               return err;
        dev->data->mtu = mtu;
        return 0;
 }
-- 
2.8.0.rc0