netdev - [PATCH net-next 2/8] sfc: Add a PROBED state for EF100 VDPA use.

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Date:   Mon, 20 Jun 2022 14:58:37 +0100
From:   Martin Habets <habetsm.xilinx@...il.com>
To:     jonathan.s.cooper@....com, davem@...emloft.net, kuba@...nel.org,
        pabeni@...hat.com, edumazet@...gle.com
Cc:     netdev@...r.kernel.org, ecree.xilinx@...il.com
Subject: [PATCH net-next 2/8] sfc: Add a PROBED state for EF100 VDPA use.

From: Jonathan Cooper <jonathan.s.cooper@....com>

For VDPA we need to tear down the driver to the point where it
has various control channels like MCDI, but it no longer has
a network device. This adds a state corresponding to
that mode that will be used when VDPA support is added.

Signed-off-by: Jonathan Cooper <jonathan.s.cooper@....com>
Co-authored-by: Martin Habets <habetsm.xilinx@...il.com>
---
 drivers/net/ethernet/sfc/ef100_netdev.c |    2 +-
 drivers/net/ethernet/sfc/efx_common.c   |    6 ++++--
 drivers/net/ethernet/sfc/efx_common.h   |    8 ++++----
 drivers/net/ethernet/sfc/net_driver.h   |    3 ++-
 4 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/sfc/ef100_netdev.c b/drivers/net/ethernet/sfc/ef100_netdev.c
index b9106ce678d9..3bb9a79bad22 100644
--- a/drivers/net/ethernet/sfc/ef100_netdev.c
+++ b/drivers/net/ethernet/sfc/ef100_netdev.c
@@ -291,7 +291,7 @@ void ef100_unregister_netdev(struct efx_nic *efx)
 {
 	if (efx_dev_registered(efx)) {
 		efx_fini_mcdi_logging(efx);
-		efx->state = STATE_UNINIT;
+		efx->state = STATE_PROBED;
 		unregister_netdev(efx->net_dev);
 	}
 }
diff --git a/drivers/net/ethernet/sfc/efx_common.c b/drivers/net/ethernet/sfc/efx_common.c
index f6baebd9d632..0e0e86a53407 100644
--- a/drivers/net/ethernet/sfc/efx_common.c
+++ b/drivers/net/ethernet/sfc/efx_common.c
@@ -1222,8 +1222,10 @@ static pci_ers_result_t efx_io_error_detected(struct pci_dev *pdev,
 
 		efx_device_detach_sync(efx);
 
-		efx_stop_all(efx);
-		efx_disable_interrupts(efx);
+		if (efx_net_active(efx->state)) {
+			efx_stop_all(efx);
+			efx_disable_interrupts(efx);
+		}
 
 		status = PCI_ERS_RESULT_NEED_RESET;
 	} else {
diff --git a/drivers/net/ethernet/sfc/efx_common.h b/drivers/net/ethernet/sfc/efx_common.h
index c72e819da8fd..1d166ca71354 100644
--- a/drivers/net/ethernet/sfc/efx_common.h
+++ b/drivers/net/ethernet/sfc/efx_common.h
@@ -43,10 +43,10 @@ void efx_start_monitor(struct efx_nic *efx);
 int __efx_reconfigure_port(struct efx_nic *efx);
 int efx_reconfigure_port(struct efx_nic *efx);
 
-#define EFX_ASSERT_RESET_SERIALISED(efx)		\
-	do {						\
-		if (efx->state != STATE_UNINIT)		\
-			ASSERT_RTNL();			\
+#define EFX_ASSERT_RESET_SERIALISED(efx)					\
+	do {									\
+		if (efx->state != STATE_UNINIT && efx->state != STATE_PROBED)	\
+			ASSERT_RTNL();						\
 	} while (0)
 
 int efx_try_recovery(struct efx_nic *efx);
diff --git a/drivers/net/ethernet/sfc/net_driver.h b/drivers/net/ethernet/sfc/net_driver.h
index 95069125931a..546552d5d86f 100644
--- a/drivers/net/ethernet/sfc/net_driver.h
+++ b/drivers/net/ethernet/sfc/net_driver.h
@@ -623,7 +623,8 @@ enum efx_int_mode {
 
 enum nic_state {
 	STATE_UNINIT = 0,	/* device being probed/removed */
-	STATE_NET_DOWN,		/* hardware probed and netdev registered */
+	STATE_PROBED,		/* hardware probed */
+	STATE_NET_DOWN,		/* netdev registered */
 	STATE_NET_UP,		/* ready for traffic */
 	STATE_DISABLED,		/* device disabled due to hardware errors */