[PATCH 5.4 151/222] bnxt_en: Do not treat DSN (Digital Serial Number) read failure as fatal.

Greg Kroah-Hartman
2020-01-22T13:26:30Z

From: Michael Chan <michael.chan@broadcom.com>

[ Upstream commit d061b2411d5f3d6272187ab734ce0640827fca13 ]

DSN read can fail, for example on a kdump kernel without PCIe extended
config space support. If DSN read fails, don't set the
BNXT_FLAG_DSN_VALID flag and continue loading. Check the flag
to see if the stored DSN is valid before using it. Only VF reps
creation should fail without valid DSN.

Fixes: 03213a996531 ("bnxt: move bp->switch_id initialization to PF probe")
Reported-by: Marc Smith <msmith626@gmail.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/net/ethernet/broadcom/bnxt/bnxt.c | 7 +++----
drivers/net/ethernet/broadcom/bnxt/bnxt.h | 1 +
drivers/net/ethernet/broadcom/bnxt/bnxt_vfr.c | 3 +++
3 files changed, 7 insertions(+), 4 deletions(-)

--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -11299,7 +11299,7 @@ int bnxt_get_port_parent_id(struct net_d
return -EOPNOTSUPP;

/* The PF and it's VF-reps only support the switchdev framework */
- if (!BNXT_PF(bp))
+ if (!BNXT_PF(bp) || !(bp->flags & BNXT_FLAG_DSN_VALID))
return -EOPNOTSUPP;

ppid->id_len = sizeof(bp->switch_id);
@@ -11691,6 +11691,7 @@ static int bnxt_pcie_dsn_get(struct bnxt
put_unaligned_le32(dw, &dsn[0]);
pci_read_config_dword(pdev, pos + 4, &dw);
put_unaligned_le32(dw, &dsn[4]);
+ bp->flags |= BNXT_FLAG_DSN_VALID;
return 0;
}

@@ -11802,9 +11803,7 @@ static int bnxt_init_one(struct pci_dev

if (BNXT_PF(bp)) {
/* Read the adapter's DSN to use as the eswitch switch_id */
- rc = bnxt_pcie_dsn_get(bp, bp->switch_id);
- if (rc)
- goto init_err_pci_clean;
+ bnxt_pcie_dsn_get(bp, bp->switch_id);
}

/* MTU range: 60 - FW defined max */
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
@@ -1510,6 +1510,7 @@ struct bnxt {
#define BNXT_FLAG_NO_AGG_RINGS 0x20000
#define BNXT_FLAG_RX_PAGE_MODE 0x40000
#define BNXT_FLAG_MULTI_HOST 0x100000
+ #define BNXT_FLAG_DSN_VALID 0x200000
#define BNXT_FLAG_DOUBLE_DB 0x400000
#define BNXT_FLAG_CHIP_NITRO_A0 0x1000000
#define BNXT_FLAG_DIM 0x2000000
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_vfr.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_vfr.c
@@ -398,6 +398,9 @@ static int bnxt_vf_reps_create(struct bn
struct net_device *dev;
int rc, i;

+ if (!(bp->flags & BNXT_FLAG_DSN_VALID))
+ return -ENODEV;
+
bp->vf_reps = kcalloc(num_vfs, sizeof(vf_rep), GFP_KERNEL);
if (!bp->vf_reps)
return -ENOMEM;