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bnx2x: Loaded Firmware Version Validation

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In a virtualized environment it is possible for a loading driver to discover
that Firmware is already loaded to the device, and that this FW does not match
its own. This can happen for example if different Physical Functions are
Assigned to different VMs in which different driver versions are loaded. The
code in this patch ensures that only drivers with matching FW are loaded over
the device, and that in the case described above where the Firmware version
doesn't match the driver load is aborted.

Signed-off-by: Ariel Elior <ariele@broadcom.com>
Signed-off-by: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ariel Elior 2012-01-26 06:01:49 +00:00 committed by David S. Miller
parent 89db4ad830
commit d1e2d9660e
1 changed files with 23 additions and 0 deletions
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23
drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
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@ -1783,6 +1783,29 @@ int bnx2x_nic_load(struct bnx2x *bp, int load_mode)
rc = -EBUSY; /* other port in diagnostic mode */
LOAD_ERROR_EXIT(bp, load_error1);
}
if (load_code != FW_MSG_CODE_DRV_LOAD_COMMON_CHIP &&
load_code != FW_MSG_CODE_DRV_LOAD_COMMON) {
/* build FW version dword */
u32 my_fw = (BCM_5710_FW_MAJOR_VERSION) +
(BCM_5710_FW_MINOR_VERSION << 8) +
(BCM_5710_FW_REVISION_VERSION << 16) +
(BCM_5710_FW_ENGINEERING_VERSION << 24);
/* read loaded FW from chip */
u32 loaded_fw = REG_RD(bp, XSEM_REG_PRAM);
DP(BNX2X_MSG_SP, "loaded fw %x, my fw %x",
loaded_fw, my_fw);
/* abort nic load if version mismatch */
if (my_fw != loaded_fw) {
BNX2X_ERR("bnx2x with FW %x already loaded, "
"which mismatches my %x FW. aborting",
loaded_fw, my_fw);
rc = -EBUSY;
LOAD_ERROR_EXIT(bp, load_error2);
}
}
} else {
int path = BP_PATH(bp);