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bnxt_en: Do not treat DSN (Digital Serial Number) read failure as fatal.

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[ 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: 03213a9965 ("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>
This commit is contained in:
Michael Chan 2020-01-17 00:32:47 -05:00 • committed by Greg Kroah-Hartman
commit 698f8c2089
3 changed files with 7 additions and 4 deletions
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7
drivers/net/ethernet/broadcom/bnxt/bnxt.c
View file

@ -11299,7 +11299,7 @@ int bnxt_get_port_parent_id(struct net_device *dev,
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 *bp, u8 dsn[])
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 *pdev, const struct pci_device_id *ent)
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 */

1
drivers/net/ethernet/broadcom/bnxt/bnxt.h
View file

@ -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

3
drivers/net/ethernet/broadcom/bnxt/bnxt_vfr.c
View file

@ -398,6 +398,9 @@ static int bnxt_vf_reps_create(struct bnxt *bp)
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;