From: Peter Dunning <pdunn...@solarflare.com> efx_start_all can return without initialising queues as a reset is pending. This means that when netif_device_attach is called, the kernel can start sending traffic without having an initialised TX queue to send to. This patch avoids this by not calling netif_device_attach if there is a pending reset.
Fixes: e283546c0465 ("sfc:On MCDI timeout, issue an FLR (and mark MCDI to fail-fast)") Signed-off-by: Edward Cree <ec...@solarflare.com> --- drivers/net/ethernet/sfc/ef10.c | 8 ++++---- drivers/net/ethernet/sfc/ef10_sriov.c | 4 ++-- drivers/net/ethernet/sfc/efx.c | 10 ++++++---- drivers/net/ethernet/sfc/efx.h | 6 ++++++ drivers/net/ethernet/sfc/selftest.c | 2 +- 5 files changed, 19 insertions(+), 11 deletions(-) diff --git a/drivers/net/ethernet/sfc/ef10.c b/drivers/net/ethernet/sfc/ef10.c index ec976ff..92e1c6d 100644 --- a/drivers/net/ethernet/sfc/ef10.c +++ b/drivers/net/ethernet/sfc/ef10.c @@ -5389,7 +5389,7 @@ static int efx_ef10_vport_set_mac_address(struct efx_nic *efx) if (rc2) goto reset_nic; - netif_device_attach(efx->net_dev); + efx_device_attach_if_not_resetting(efx); return rc; @@ -5675,7 +5675,7 @@ static int efx_ef10_set_mac_address(struct efx_nic *efx) if (was_enabled) efx_net_open(efx->net_dev); - netif_device_attach(efx->net_dev); + efx_device_attach_if_not_resetting(efx); #ifdef CONFIG_SFC_SRIOV if (efx->pci_dev->is_virtfn && efx->pci_dev->physfn) { @@ -6127,7 +6127,7 @@ static int efx_ef10_set_udp_tnl_ports(struct efx_nic *efx, bool unloading) if (!(nic_data->datapath_caps & (1 << MC_CMD_GET_CAPABILITIES_OUT_VXLAN_NVGRE_LBN))) { - netif_device_attach(efx->net_dev); + efx_device_attach_if_not_resetting(efx); return 0; } @@ -6199,7 +6199,7 @@ static int efx_ef10_set_udp_tnl_ports(struct efx_nic *efx, bool unloading) * trigger a re-attach. Since there won't be an MC reset, we * have to do the attach ourselves. */ - netif_device_attach(efx->net_dev); + efx_device_attach_if_not_resetting(efx); } return rc; diff --git a/drivers/net/ethernet/sfc/ef10_sriov.c b/drivers/net/ethernet/sfc/ef10_sriov.c index ed4b142..b7e4345 100644 --- a/drivers/net/ethernet/sfc/ef10_sriov.c +++ b/drivers/net/ethernet/sfc/ef10_sriov.c @@ -549,7 +549,7 @@ int efx_ef10_sriov_set_vf_mac(struct efx_nic *efx, int vf_i, u8 *mac) vf->efx->type->filter_table_probe(vf->efx); up_write(&vf->efx->filter_sem); efx_net_open(vf->efx->net_dev); - netif_device_attach(vf->efx->net_dev); + efx_device_attach_if_not_resetting(vf->efx); } return 0; @@ -667,7 +667,7 @@ int efx_ef10_sriov_set_vf_vlan(struct efx_nic *efx, int vf_i, u16 vlan, if (rc2) goto reset_nic; - netif_device_attach(vf->efx->net_dev); + efx_device_attach_if_not_resetting(vf->efx); } return rc; diff --git a/drivers/net/ethernet/sfc/efx.c b/drivers/net/ethernet/sfc/efx.c index 8c4c273..334bcc6 100644 --- a/drivers/net/ethernet/sfc/efx.c +++ b/drivers/net/ethernet/sfc/efx.c @@ -876,7 +876,7 @@ efx_realloc_channels(struct efx_nic *efx, u32 rxq_entries, u32 txq_entries) efx_schedule_reset(efx, RESET_TYPE_DISABLE); } else { efx_start_all(efx); - netif_device_attach(efx->net_dev); + efx_device_attach_if_not_resetting(efx); } return rc; @@ -2182,6 +2182,8 @@ int efx_net_open(struct net_device *net_dev) efx_link_status_changed(efx); efx_start_all(efx); + if (efx->state == STATE_DISABLED || efx->reset_pending) + netif_device_detach(efx->net_dev); efx_selftest_async_start(efx); return 0; } @@ -2248,7 +2250,7 @@ static int efx_change_mtu(struct net_device *net_dev, int new_mtu) mutex_unlock(&efx->mac_lock); efx_start_all(efx); - netif_device_attach(efx->net_dev); + efx_device_attach_if_not_resetting(efx); return 0; } @@ -2744,7 +2746,7 @@ int efx_reset(struct efx_nic *efx, enum reset_type method) efx->state = STATE_DISABLED; } else { netif_dbg(efx, drv, efx->net_dev, "reset complete\n"); - netif_device_attach(efx->net_dev); + efx_device_attach_if_not_resetting(efx); } return rc; } @@ -3417,7 +3419,7 @@ static int efx_pm_thaw(struct device *dev) efx_start_all(efx); - netif_device_attach(efx->net_dev); + efx_device_attach_if_not_resetting(efx); efx->state = STATE_READY; diff --git a/drivers/net/ethernet/sfc/efx.h b/drivers/net/ethernet/sfc/efx.h index 342ae16..ee146624 100644 --- a/drivers/net/ethernet/sfc/efx.h +++ b/drivers/net/ethernet/sfc/efx.h @@ -276,6 +276,12 @@ static inline void efx_device_detach_sync(struct efx_nic *efx) netif_tx_unlock_bh(dev); } +static inline void efx_device_attach_if_not_resetting(struct efx_nic *efx) +{ + if ((efx->state != STATE_DISABLED) && !efx->reset_pending) + netif_device_attach(efx->net_dev); +} + static inline bool efx_rwsem_assert_write_locked(struct rw_semaphore *sem) { if (WARN_ON(down_read_trylock(sem))) { diff --git a/drivers/net/ethernet/sfc/selftest.c b/drivers/net/ethernet/sfc/selftest.c index cd38b44..dab286a 100644 --- a/drivers/net/ethernet/sfc/selftest.c +++ b/drivers/net/ethernet/sfc/selftest.c @@ -768,7 +768,7 @@ int efx_selftest(struct efx_nic *efx, struct efx_self_tests *tests, __efx_reconfigure_port(efx); mutex_unlock(&efx->mac_lock); - netif_device_attach(efx->net_dev); + efx_device_attach_if_not_resetting(efx); return rc_test; }