bnxt_en: fix the handling of PCIE-AER

Fix the sequence required for PCIE-AER. While slot reset occurs, firmware
might not be ready and the driver needs to check for its recovery.  We
also need to remap the health registers for some chips and clear the
resource reservations.  The resources will be allocated again during
bnxt_io_resume().

Fixes: 1541dc7bd15c ("bnxt_en: Fix AER recovery.")
Signed-off-by: Vikas Gupta <vikas.gupta@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 3743d9755eb43ba6e222428ed9bc58a279b527bc..f44f9367b7fd61fc69b3f57974f1a54557b7337c 100644 (file)
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -13922,7 +13922,9 @@ static pci_ers_result_t bnxt_io_slot_reset(struct pci_dev *pdev)
        pci_ers_result_t result = PCI_ERS_RESULT_DISCONNECT;
        struct net_device *netdev = pci_get_drvdata(pdev);
        struct bnxt *bp = netdev_priv(netdev);
-       int err = 0, off;
+       int retry = 0;
+       int err = 0;
+       int off;
 
        netdev_info(bp->dev, "PCI Slot Reset\n");
 
@@ -13950,11 +13952,36 @@ static pci_ers_result_t bnxt_io_slot_reset(struct pci_dev *pdev)
                pci_restore_state(pdev);
                pci_save_state(pdev);
 
+               bnxt_inv_fw_health_reg(bp);
+               bnxt_try_map_fw_health_reg(bp);
+
+               /* In some PCIe AER scenarios, firmware may take up to
+                * 10 seconds to become ready in the worst case.
+                */
+               do {
+                       err = bnxt_try_recover_fw(bp);
+                       if (!err)
+                               break;
+                       retry++;
+               } while (retry < BNXT_FW_SLOT_RESET_RETRY);
+
+               if (err) {
+                       dev_err(&pdev->dev, "Firmware not ready\n");
+                       goto reset_exit;
+               }
+
                err = bnxt_hwrm_func_reset(bp);
                if (!err)
                        result = PCI_ERS_RESULT_RECOVERED;
+
+               bnxt_ulp_irq_stop(bp);
+               bnxt_clear_int_mode(bp);
+               err = bnxt_init_int_mode(bp);
+               bnxt_ulp_irq_restart(bp, err);
        }
 
+reset_exit:
+       bnxt_clear_reservations(bp, true);
        rtnl_unlock();
 
        return result;

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.h b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
index b1b17f911300636983455eb11c6f50116c3c583b..d5fa43cfe5248e860d49207d352fad8ea9afa2b4 100644 (file)
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
@@ -1621,6 +1621,7 @@ struct bnxt_fw_health {
 
 #define BNXT_FW_RETRY                  5
 #define BNXT_FW_IF_RETRY               10
+#define BNXT_FW_SLOT_RESET_RETRY       4
 
 enum board_idx {
        BCM57301,

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_hwrm.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_hwrm.c
index b01d42928a53c5594f5d92cc09cbbb2a050ad6f6..132442f16fe676916a5b55119f17512eb37c0bbc 100644 (file)
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_hwrm.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_hwrm.c
@@ -476,7 +476,8 @@ static int __hwrm_send(struct bnxt *bp, struct bnxt_hwrm_ctx *ctx)
                memset(ctx->resp, 0, PAGE_SIZE);
 
        req_type = le16_to_cpu(ctx->req->req_type);
-       if (BNXT_NO_FW_ACCESS(bp) && req_type != HWRM_FUNC_RESET) {
+       if (BNXT_NO_FW_ACCESS(bp) &&
+           (req_type != HWRM_FUNC_RESET && req_type != HWRM_VER_GET)) {
                netdev_dbg(bp->dev, "hwrm req_type 0x%x skipped, FW channel down\n",
                           req_type);
                goto exit;