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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>
This commit is contained in:
Sriharsha Basavapatna 2018-04-11 11:50:16 -04:00 committed by David S. Miller
parent 479ca3bf91
commit 9d96465b11
1 changed files with 30 additions and 0 deletions
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30
drivers/net/ethernet/broadcom/bnxt/bnxt_vfr.c
View File

@ -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[])