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authorAriel Elior <ariel.elior@qlogic.com>2014-06-12 07:55:32 +0300
committerDavid S. Miller <davem@davemloft.net>2014-06-12 10:28:18 -0700
commitf2cfa997ef77bcfc3900eb968fa5254f951bb8f2 (patch)
tree555f786ec35500d64f95c03605bc041a178c2543
parentb17b0ca1642c23f0cd4e4cf52cdb9970798f3501 (diff)
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>
-rw-r--r--drivers/net/ethernet/broadcom/bnx2x/bnx2x_sriov.c6
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)