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Message-ID: <65ea33f2-0fd6-3831-41c4-fd797a628d3a@solarflare.com>
Date: Fri, 17 Feb 2017 15:50:43 +0000
From: Edward Cree <ecree@...arflare.com>
To: <linux-net-drivers@...arflare.com>, <davem@...emloft.net>
CC: <netdev@...r.kernel.org>
Subject: [PATCH net-next 3/3] sfc: do not device_attach if a reset is pending
From: Peter Dunning <pdunning@...arflare.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 <ecree@...arflare.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;
}
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