bnxt_en: Support max-mtu with VF-reps

While a VF is configured with a bigger mtu (> 1500), any packets that
are punted to the VF-rep (slow-path) get dropped by OVS kernel-datapath
with the following message: "dropped over-mtu packet". Fix this by
returning the max-mtu value for a VF-rep derived from its corresponding VF.
VF-rep's mtu can be changed using 'ip' command as shown in this example:

	$ ip link set bnxt0_pf0vf0 mtu 9000

Signed-off-by: Sriharsha Basavapatna <sriharsha.basavapatna@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_vfr.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_vfr.c
index 2629040..38f635c 100644 (file)
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_vfr.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_vfr.c
@@ -64,6 +64,31 @@ static int hwrm_cfa_vfr_free(struct bnxt *bp, u16 vf_idx)
        return rc;
 }
 
+static int bnxt_hwrm_vfr_qcfg(struct bnxt *bp, struct bnxt_vf_rep *vf_rep,
+                             u16 *max_mtu)
+{
+       struct hwrm_func_qcfg_output *resp = bp->hwrm_cmd_resp_addr;
+       struct hwrm_func_qcfg_input req = {0};
+       u16 mtu;
+       int rc;
+
+       bnxt_hwrm_cmd_hdr_init(bp, &req, HWRM_FUNC_QCFG, -1, -1);
+       req.fid = cpu_to_le16(bp->pf.vf[vf_rep->vf_idx].fw_fid);
+
+       mutex_lock(&bp->hwrm_cmd_lock);
+
+       rc = _hwrm_send_message(bp, &req, sizeof(req), HWRM_CMD_TIMEOUT);
+       if (!rc) {
+               mtu = le16_to_cpu(resp->max_mtu_configured);
+               if (!mtu)
+                       *max_mtu = BNXT_MAX_MTU;
+               else
+                       *max_mtu = mtu;
+       }
+       mutex_unlock(&bp->hwrm_cmd_lock);
+       return rc;
+}
+
 static int bnxt_vf_rep_open(struct net_device *dev)
 {
        struct bnxt_vf_rep *vf_rep = netdev_priv(dev);
@@ -365,6 +390,7 @@ static void bnxt_vf_rep_netdev_init(struct bnxt *bp, struct bnxt_vf_rep *vf_rep,
                                    struct net_device *dev)
 {
        struct net_device *pf_dev = bp->dev;
+       u16 max_mtu;
 
        dev->netdev_ops = &bnxt_vf_rep_netdev_ops;
        dev->ethtool_ops = &bnxt_vf_rep_ethtool_ops;
@@ -380,6 +406,10 @@ static void bnxt_vf_rep_netdev_init(struct bnxt *bp, struct bnxt_vf_rep *vf_rep,
        bnxt_vf_rep_eth_addr_gen(bp->pf.mac_addr, vf_rep->vf_idx,
                                 dev->perm_addr);
        ether_addr_copy(dev->dev_addr, dev->perm_addr);
+       /* Set VF-Rep's max-mtu to the corresponding VF's max-mtu */
+       if (!bnxt_hwrm_vfr_qcfg(bp, vf_rep, &max_mtu))
+               dev->max_mtu = max_mtu;
+       dev->min_mtu = ETH_ZLEN;
 }
 
 static int bnxt_pcie_dsn_get(struct bnxt *bp, u8 dsn[])