[PATCH v4 5/9] net/gve: add support for MTU setting

[Junfeng Guo]

Support dev_ops mtu_set.

Signed-off-by: Xiaoyun Li <xiaoyun...@intel.com>
Signed-off-by: Junfeng Guo <junfeng....@intel.com>
---
 doc/guides/nics/features/gve.ini |  1 +
 drivers/net/gve/gve_ethdev.c     | 29 +++++++++++++++++++++++++++++
 2 files changed, 30 insertions(+)

diff --git a/doc/guides/nics/features/gve.ini b/doc/guides/nics/features/gve.ini
index d03e3ac89e..fbff0a5462 100644
--- a/doc/guides/nics/features/gve.ini
+++ b/doc/guides/nics/features/gve.ini
@@ -6,6 +6,7 @@
 [Features]
 Speed capabilities   = Y
 Link status          = Y
+MTU update           = Y
 Linux                = Y
 x86-32               = Y
 x86-64               = Y
diff --git a/drivers/net/gve/gve_ethdev.c b/drivers/net/gve/gve_ethdev.c
index 43112d901a..5bcc9ab3a0 100644
--- a/drivers/net/gve/gve_ethdev.c
+++ b/drivers/net/gve/gve_ethdev.c
@@ -94,12 +94,41 @@ gve_dev_close(struct rte_eth_dev *dev)
        return err;
 }
 
+static int
+gve_dev_mtu_set(struct rte_eth_dev *dev, uint16_t mtu)
+{
+       struct gve_priv *priv = dev->data->dev_private;
+       int err;
+
+       if (mtu < RTE_ETHER_MIN_MTU || mtu > priv->max_mtu) {
+               PMD_DRV_LOG(ERR, "MIN MTU is %u MAX MTU is %u", 
RTE_ETHER_MIN_MTU, priv->max_mtu);
+               return -EINVAL;
+       }
+
+       /* mtu setting is forbidden if port is start */
+       if (dev->data->dev_started) {
+               PMD_DRV_LOG(ERR, "Port must be stopped before configuration");
+               return -EBUSY;
+       }
+
+       dev->data->dev_conf.rxmode.mtu = mtu + RTE_ETHER_HDR_LEN;
+
+       err = gve_adminq_set_mtu(priv, mtu);
+       if (err) {
+               PMD_DRV_LOG(ERR, "Failed to set mtu as %u err = %d", mtu, err);
+               return err;
+       }
+
+       return 0;
+}
+
 static const struct eth_dev_ops gve_eth_dev_ops = {
        .dev_configure        = gve_dev_configure,
        .dev_start            = gve_dev_start,
        .dev_stop             = gve_dev_stop,
        .dev_close            = gve_dev_close,
        .link_update          = gve_link_update,
+       .mtu_set              = gve_dev_mtu_set,
 };
 
 static void
-- 
2.34.1