[dpdk-dev] [PATCH 1/2] net/bnx2x: fix for PCI FLR after ungraceful exit

[Rasesh Mody]

From: Rasesh Mody <rasesh.mody at qlogic.com>

This patch provides a fix for PCI function level reset after an
ungraceful exit from an application. The fix is to enable internal
target read as part of device attach before getting device information
from device config space, device itself and shared memory. In addition
to that, add a 200ms delay for the recovery flow to complete.

Fixes: 540a211084a7 ("bnx2x: driver core")
Cc: stable at dpdk.org

Signed-off-by: Rasesh Mody <rasesh.mody at qlogic.com>
---
 drivers/net/bnx2x/bnx2x.c |   24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/drivers/net/bnx2x/bnx2x.c b/drivers/net/bnx2x/bnx2x.c
index 382b50f..bfd9cce 100644
--- a/drivers/net/bnx2x/bnx2x.c
+++ b/drivers/net/bnx2x/bnx2x.c
@@ -8285,16 +8285,6 @@ static int bnx2x_get_device_info(struct bnx2x_softc *sc)
 			REG_WR(sc, PXP2_REG_PGL_ADDR_90_F1, 0);
 			REG_WR(sc, PXP2_REG_PGL_ADDR_94_F1, 0);
 		}
-
-/*
- * Enable internal target-read (in case we are probed after PF
- * FLR). Must be done prior to any BAR read access. Only for
- * 57712 and up
- */
-		if (!CHIP_IS_E1x(sc)) {
-			REG_WR(sc, PGLUE_B_REG_INTERNAL_PFID_ENABLE_TARGET_READ,
-			       1);
-		}
 	}
 
 	/* get the nvram size */
@@ -9671,7 +9661,17 @@ int bnx2x_attach(struct bnx2x_softc *sc)
 	bnx2x_init_rte(sc);
 
 	if (IS_PF(sc)) {
-/* get device info and set params */
+		/* Enable internal target-read (in case we are probed after PF
+		 * FLR). Must be done prior to any BAR read access. Only for
+		 * 57712 and up
+		 */
+		if (!CHIP_IS_E1x(sc)) {
+			REG_WR(sc, PGLUE_B_REG_INTERNAL_PFID_ENABLE_TARGET_READ,
+			       1);
+			DELAY(200000);
+		}
+
+		/* get device info and set params */
 		if (bnx2x_get_device_info(sc) != 0) {
 			PMD_DRV_LOG(NOTICE, "getting device info");
 			return -ENXIO;
@@ -9680,7 +9680,7 @@ int bnx2x_attach(struct bnx2x_softc *sc)
 /* get phy settings from shmem and 'and' against admin settings */
 		bnx2x_get_phy_info(sc);
 	} else {
-/* Left mac of VF unfilled, PF should set it for VF */
+		/* Left mac of VF unfilled, PF should set it for VF */
 		memset(sc->link_params.mac_addr, 0, ETHER_ADDR_LEN);
 	}
 
-- 
1.7.10.3