bnx2x: Prevent panic during DMAE timeout

If chip enters a recovery flow just after the driver issues a DMAE request
the DMAE will timeout. Current code will cause a bnx2x_panic() as a result,
which means interface will no longer be usable (regardless of the recovery
results), as bnx2x_panic() is irreversible for the driver.

As this is a possible flow, the panic should be reached only when driver
is compiled with STOP_ON_ERROR.

Signed-off-by: Dmitry Kravkov <dmitry@broadcom.com>
Signed-off-by: Yuval Mintz <yuvalmin@broadcom.com>
Signed-off-by: Ariel Elior <ariele@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
index bb2f20291509392192545f495a290cec93f60e1d..a4c2dc29534438af53c4bfc21cd5c6ea715bf811 100644 (file)
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
@@ -577,7 +577,9 @@ void bnx2x_write_dmae(struct bnx2x *bp, dma_addr_t dma_addr, u32 dst_addr,
        rc = bnx2x_issue_dmae_with_comp(bp, &dmae, bnx2x_sp(bp, wb_comp));
        if (rc) {
                BNX2X_ERR("DMAE returned failure %d\n", rc);
+#ifdef BNX2X_STOP_ON_ERROR
                bnx2x_panic();
+#endif
        }
 }
 
@@ -614,7 +616,9 @@ void bnx2x_read_dmae(struct bnx2x *bp, u32 src_addr, u32 len32)
        rc = bnx2x_issue_dmae_with_comp(bp, &dmae, bnx2x_sp(bp, wb_comp));
        if (rc) {
                BNX2X_ERR("DMAE returned failure %d\n", rc);
+#ifdef BNX2X_STOP_ON_ERROR
                bnx2x_panic();
+#endif
        }
 }
 
@@ -9352,6 +9356,10 @@ static int bnx2x_process_kill(struct bnx2x *bp, bool global)
        bnx2x_process_kill_chip_reset(bp, global);
        barrier();
 
+       /* clear errors in PGB */
+       if (!CHIP_IS_E1x(bp))
+               REG_WR(bp, PGLUE_B_REG_LATCHED_ERRORS_CLR, 0x7f);
+
        /* Recover after reset: */
        /* MCP */
        if (global && bnx2x_reset_mcp_comp(bp, val))

diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_reg.h b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_reg.h
index 5ecf267dc4cc8da779112356057cb8253d27e7cb..3efbb35267c853d576cc3a4d3104ec4ba1a18d1d 100644 (file)
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_reg.h
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_reg.h
@@ -2864,6 +2864,17 @@
 #define PGLUE_B_REG_INTERNAL_PFID_ENABLE_TARGET_READ            0x9430
 #define PGLUE_B_REG_INTERNAL_PFID_ENABLE_TARGET_WRITE           0x9434
 #define PGLUE_B_REG_INTERNAL_VFID_ENABLE                        0x9438
+/* [W 7] Writing 1 to each bit in this register clears a corresponding error
+ * details register and enables logging new error details. Bit 0 - clears
+ * INCORRECT_RCV_DETAILS; Bit 1 - clears RX_ERR_DETAILS; Bit 2 - clears
+ * TX_ERR_WR_ADD_31_0 TX_ERR_WR_ADD_63_32 TX_ERR_WR_DETAILS
+ * TX_ERR_WR_DETAILS2 TX_ERR_RD_ADD_31_0 TX_ERR_RD_ADD_63_32
+ * TX_ERR_RD_DETAILS TX_ERR_RD_DETAILS2 TX_ERR_WR_DETAILS_ICPL; Bit 3 -
+ * clears VF_LENGTH_VIOLATION_DETAILS. Bit 4 - clears
+ * VF_GRC_SPACE_VIOLATION_DETAILS. Bit 5 - clears RX_TCPL_ERR_DETAILS. Bit 6
+ * - clears TCPL_IN_TWO_RCBS_DETAILS. */
+#define PGLUE_B_REG_LATCHED_ERRORS_CLR                          0x943c
+
 /* [R 9] Interrupt register #0 read */
 #define PGLUE_B_REG_PGLUE_B_INT_STS                             0x9298
 /* [RC 9] Interrupt register #0 read clear */