net/octeontx2: fix MTU when PTP is enabled

Update MTU value based on PTP enable status and reserve eight
bytes in TX path to accommodate VLAN tags.

If PTP is enabled maximum allowed MTU is 9200 otherwise it's 9208.

Fixes: b5dc3140448e ("net/octeontx2: support base PTP")
Cc: stable@dpdk.org
Signed-off-by: Hanumanth Reddy Pothula <hpothula@marvell.com>
Acked-by: Jerin Jacob <jerinj@marvell.com>

diff --git a/drivers/net/octeontx2/otx2_ethdev_ops.c b/drivers/net/octeontx2/otx2_ethdev_ops.c
index 5a45012..552e6bd 100644 (file)
--- a/drivers/net/octeontx2/otx2_ethdev_ops.c
+++ b/drivers/net/octeontx2/otx2_ethdev_ops.c
@@ -17,7 +17,8 @@ otx2_nix_mtu_set(struct rte_eth_dev *eth_dev, uint16_t mtu)
        struct nix_frs_cfg *req;
        int rc;
 
-       frame_size += NIX_TIMESYNC_RX_OFFSET * otx2_ethdev_is_ptp_en(dev);
+       if (dev->configured && otx2_ethdev_is_ptp_en(dev))
+               frame_size += NIX_TIMESYNC_RX_OFFSET;
 
        /* Check if MTU is within the allowed range */
        if (frame_size < NIX_MIN_FRS || frame_size > NIX_MAX_FRS)
@@ -547,6 +548,11 @@ otx2_nix_info_get(struct rte_eth_dev *eth_dev, struct rte_eth_dev_info *devinfo)
        devinfo->max_vfs = pci_dev->max_vfs;
        devinfo->max_mtu = devinfo->max_rx_pktlen - NIX_L2_OVERHEAD;
        devinfo->min_mtu = devinfo->min_rx_bufsize - NIX_L2_OVERHEAD;
+       if (dev->configured && otx2_ethdev_is_ptp_en(dev)) {
+               devinfo->max_mtu -=  NIX_TIMESYNC_RX_OFFSET;
+               devinfo->min_mtu -=  NIX_TIMESYNC_RX_OFFSET;
+               devinfo->max_rx_pktlen -= NIX_TIMESYNC_RX_OFFSET;
+       }
 
        devinfo->rx_offload_capa = dev->rx_offload_capa;
        devinfo->tx_offload_capa = dev->tx_offload_capa;