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| author | Ariel Elior <ariel.elior@qlogic.com> | 2014-06-12 07:55:32 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-06-12 10:28:18 -0700 |
| commit | f2cfa997ef77bcfc3900eb968fa5254f951bb8f2 (patch) | |
| tree | 555f786ec35500d64f95c03605bc041a178c2543 /drivers/net/ethernet/broadcom | |
| parent | b17b0ca1642c23f0cd4e4cf52cdb9970798f3501 (diff) | |
| download | blackbird-op-linux-f2cfa997ef77bcfc3900eb968fa5254f951bb8f2.tar.gz blackbird-op-linux-f2cfa997ef77bcfc3900eb968fa5254f951bb8f2.zip | |
bnx2x: Enlarge the dorq threshold for VFs
A malicious VF might try to starve the other VFs & PF by creating
contineous doorbell floods. In order to negate this, HW has a threshold of
doorbells per client, which will stop the client doorbells from arriving
if crossed.
The threshold currently configured for VFs is too low - under extreme traffic
scenarios, it's possible for a VF to reach the threshold and thus for its
fastpath to stop working.
Signed-off-by: Ariel Elior <ariel.elior@qlogic.com>
Signed-off-by: Yuval Mintz <yuval.mintz@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/broadcom')
| -rw-r--r-- | drivers/net/ethernet/broadcom/bnx2x/bnx2x_sriov.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_sriov.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_sriov.c index a93c7af7afe6..f7edb4204f91 100644 --- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_sriov.c +++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_sriov.c @@ -1071,8 +1071,10 @@ void bnx2x_iov_init_dq(struct bnx2x *bp) REG_WR(bp, DORQ_REG_VF_TYPE_MIN_MCID_0, 0); REG_WR(bp, DORQ_REG_VF_TYPE_MAX_MCID_0, 0x1ffff); - /* set the VF doorbell threshold */ - REG_WR(bp, DORQ_REG_VF_USAGE_CT_LIMIT, 4); + /* set the VF doorbell threshold. This threshold represents the amount + * of doorbells allowed in the main DORQ fifo for a specific VF. + */ + REG_WR(bp, DORQ_REG_VF_USAGE_CT_LIMIT, 64); } void bnx2x_iov_init_dmae(struct bnx2x *bp) |
