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[net-next,3/9] qed: Set HW-channel to ready before ACKing VF

Message ID 1489921700-6850-4-git-send-email-Yuval.Mintz@cavium.com
State Accepted, archived
Delegated to: David Miller
Headers show

Commit Message

Mintz, Yuval March 19, 2017, 11:08 a.m. UTC 
When PF responds to the VF requests it also cleans the HW-channel
indication in firmware to allow further VF messages to arrive,
but the order currently applied is wrong -
The PF is copying by DMAE the response the VF is polling on for
completion, and only afterwards sets the HW-channel to ready state.

This creates a race condition where the VF would be able to send
an additional message to the PF before the channel would get ready
again, causing the firmware to consider the VF as malicious.

Signed-off-by: Yuval Mintz <Yuval.Mintz@cavium.com>
---
 drivers/net/ethernet/qlogic/qed/qed_sriov.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)
diff mbox

Patch

diff --git a/drivers/net/ethernet/qlogic/qed/qed_sriov.c b/drivers/net/ethernet/qlogic/qed/qed_sriov.c
index 2403d58..aea1e4c 100644
--- a/drivers/net/ethernet/qlogic/qed/qed_sriov.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_sriov.c
@@ -1136,13 +1136,17 @@  static void qed_iov_send_response(struct qed_hwfn *p_hwfn,
 			   (sizeof(union pfvf_tlvs) - sizeof(u64)) / 4,
 			   &params);
 
-	qed_dmae_host2host(p_hwfn, p_ptt, mbx->reply_phys,
-			   mbx->req_virt->first_tlv.reply_address,
-			   sizeof(u64) / 4, &params);
-
+	/* Once PF copies the rc to the VF, the latter can continue
+	 * and send an additional message. So we have to make sure the
+	 * channel would be re-set to ready prior to that.
+	 */
 	REG_WR(p_hwfn,
 	       GTT_BAR0_MAP_REG_USDM_RAM +
 	       USTORM_VF_PF_CHANNEL_READY_OFFSET(eng_vf_id), 1);
+
+	qed_dmae_host2host(p_hwfn, p_ptt, mbx->reply_phys,
+			   mbx->req_virt->first_tlv.reply_address,
+			   sizeof(u64) / 4, &params);
 }
 
 static u16 qed_iov_vport_to_tlv(struct qed_hwfn *p_hwfn,