From 8a531400623c52b09bc3b718e9a6142eb60a11a7 Mon Sep 17 00:00:00 2001 From: Jon Cooper Date: Wed, 8 Feb 2017 16:51:18 +0000 Subject: [PATCH] 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 Signed-off-by: David S. Miller --- drivers/net/ethernet/sfc/efx.c | 99 +++++++++++++++++++++++++++--------------- 1 file changed, 64 insertions(+), 35 deletions(-) diff --git a/drivers/net/ethernet/sfc/efx.c b/drivers/net/ethernet/sfc/efx.c index c28cd9d..baab0a2 100644 --- a/drivers/net/ethernet/sfc/efx.c +++ b/drivers/net/ethernet/sfc/efx.c @@ -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: -- 2.7.4