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sfc: harden driver against MC resets during initial probe 

This is mainly to prepare for a future overlay networking patch that
 could cause an MC reset at probe time if the UDP tunnel port list is
 set immediately upon driver load.

Signed-off-by: Edward Cree <ecree@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jon Cooper 2017-02-08 16:51:18 +00:00 committed by David S. Miller
parent da50ae2eae
commit 8a53140062
1 changed files with 64 additions and 35 deletions
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99
drivers/net/ethernet/sfc/efx.c
View File

@ -3136,6 +3136,51 @@ static int efx_pci_probe_main(struct efx_nic *efx)
return rc;
}
static int efx_pci_probe_post_io(struct efx_nic *efx)
{
struct net_device *net_dev = efx->net_dev;
int rc = efx_pci_probe_main(efx);
if (rc)
return rc;
if (efx->type->sriov_init) {
rc = efx->type->sriov_init(efx);
if (rc)
netif_err(efx, probe, efx->net_dev,
"SR-IOV can't be enabled rc %d\n", rc);
}
/* Determine netdevice features */
net_dev->features |= (efx->type->offload_features | NETIF_F_SG |
NETIF_F_TSO | NETIF_F_RXCSUM);
if (efx->type->offload_features & (NETIF_F_IPV6_CSUM | NETIF_F_HW_CSUM))
net_dev->features |= NETIF_F_TSO6;
/* Check whether device supports TSO */
if (!efx->type->tso_versions || !efx->type->tso_versions(efx))
net_dev->features &= ~NETIF_F_ALL_TSO;
/* Mask for features that also apply to VLAN devices */
net_dev->vlan_features |= (NETIF_F_HW_CSUM | NETIF_F_SG |
NETIF_F_HIGHDMA | NETIF_F_ALL_TSO |
NETIF_F_RXCSUM);
net_dev->hw_features = net_dev->features & ~efx->fixed_features;
/* Disable VLAN filtering by default. It may be enforced if
* the feature is fixed (i.e. VLAN filters are required to
* receive VLAN tagged packets due to vPort restrictions).
*/
net_dev->features &= ~NETIF_F_HW_VLAN_CTAG_FILTER;
net_dev->features |= efx->fixed_features;
rc = efx_register_netdev(efx);
if (!rc)
return 0;
efx_pci_remove_main(efx);
return rc;
}
/* NIC initialisation
*
* This is called at module load (or hotplug insertion,
@ -3178,42 +3223,28 @@ static int efx_pci_probe(struct pci_dev *pci_dev,
if (rc)
goto fail2;
rc = efx_pci_probe_main(efx);
rc = efx_pci_probe_post_io(efx);
if (rc) {
/* On failure, retry once immediately.
* If we aborted probe due to a scheduled reset, dismiss it.
*/
efx->reset_pending = 0;
rc = efx_pci_probe_post_io(efx);
if (rc) {
/* On another failure, retry once more
* after a 50-305ms delay.
*/
unsigned char r;
get_random_bytes(&r, 1);
msleep((unsigned int)r + 50);
efx->reset_pending = 0;
rc = efx_pci_probe_post_io(efx);
}
}
if (rc)
goto fail3;
net_dev->features |= (efx->type->offload_features | NETIF_F_SG |
NETIF_F_TSO | NETIF_F_RXCSUM);
if (efx->type->offload_features & (NETIF_F_IPV6_CSUM | NETIF_F_HW_CSUM))
net_dev->features |= NETIF_F_TSO6;
/* Check whether device supports TSO */
if (!efx->type->tso_versions || !efx->type->tso_versions(efx))
net_dev->features &= ~NETIF_F_ALL_TSO;
/* Mask for features that also apply to VLAN devices */
net_dev->vlan_features |= (NETIF_F_HW_CSUM | NETIF_F_SG |
NETIF_F_HIGHDMA | NETIF_F_ALL_TSO |
NETIF_F_RXCSUM);
net_dev->hw_features = net_dev->features & ~efx->fixed_features;
/* Disable VLAN filtering by default. It may be enforced if
* the feature is fixed (i.e. VLAN filters are required to
* receive VLAN tagged packets due to vPort restrictions).
*/
net_dev->features &= ~NETIF_F_HW_VLAN_CTAG_FILTER;
net_dev->features |= efx->fixed_features;
rc = efx_register_netdev(efx);
if (rc)
goto fail4;
if (efx->type->sriov_init) {
rc = efx->type->sriov_init(efx);
if (rc)
netif_err(efx, probe, efx->net_dev,
"SR-IOV can't be enabled rc %d\n", rc);
}
netif_dbg(efx, probe, efx->net_dev, "initialisation successful\n");
/* Try to create MTDs, but allow this to fail */
@ -3232,8 +3263,6 @@ static int efx_pci_probe(struct pci_dev *pci_dev,
return 0;
fail4:
efx_pci_remove_main(efx);
fail3:
efx_fini_io(efx);
fail2: