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Commit f2cfa997 authored by Ariel Elior's avatar Ariel Elior Committed by David S. Miller
Browse files

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: default avatarAriel Elior <ariel.elior@qlogic.com>
Signed-off-by: default avatarYuval Mintz <yuval.mintz@qlogic.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent b17b0ca1

drivers/net/ethernet/broadcom/bnx2x/bnx2x_sriov.c

+4 −2
Original line number Diff line number Diff line
@@ -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)