be2net: create/destroy rx-queues on interface open/close

On some skews, the BE card sends pause frames (and not drop pkts) if there are
no more posted buffers available for packet reception.  This behaviour has a
side effect: When an interface is disabled, buffers are no longer posted on the
corresponding RX rings. All broadcast and multicast traffic being received on
the port will quickly fill up the PMEM and cause pause push back. As the PMEM
is shared by both the ports, all traffic being received on the other (enabled)
port also gets stalled.
The fix is to destroy RX rings when the interface is disabled. If there is no
RX ring match in the RXF lookup, the packets are discarded and so don't hog the
PMEM.
The RXQ creation cmd must now use MCC instead of MBOX as they are are called
post MCC queue creation.

Signed-off-by: Sathya Perla <sathya.perla@emulex.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 41 insertions, 7 deletions

diff --git a/drivers/net/benet/be_cmds.c b/drivers/net/benet/be_cmds.c
index d09351c56a1..f520a5c7503 100644
--- a/drivers/net/benet/be_cmds.c
+++ b/drivers/net/benet/be_cmds.c
@@ -984,7 +984,7 @@ int be_cmd_txq_create(struct be_adapter *adapter,
 	return status;
 }
 
-/* Uses mbox */
+/* Uses MCC */
 int be_cmd_rxq_create(struct be_adapter *adapter,
 		struct be_queue_info *rxq, u16 cq_id, u16 frag_size,
 		u16 max_frame_size, u32 if_id, u32 rss, u8 *rss_id)
@@ -994,10 +994,13 @@ int be_cmd_rxq_create(struct be_adapter *adapter,
 	struct be_dma_mem *q_mem = &rxq->dma_mem;
 	int status;
 
-	if (mutex_lock_interruptible(&adapter->mbox_lock))
-		return -1;
+	spin_lock_bh(&adapter->mcc_lock);
 
-	wrb = wrb_from_mbox(adapter);
+	wrb = wrb_from_mccq(adapter);
+	if (!wrb) {
+		status = -EBUSY;
+		goto err;
+	}
 	req = embedded_payload(wrb);
 
 	be_wrb_hdr_prepare(wrb, sizeof(*req), true, 0,
@@ -1014,7 +1017,7 @@ int be_cmd_rxq_create(struct be_adapter *adapter,
 	req->max_frame_size = cpu_to_le16(max_frame_size);
 	req->rss_queue = cpu_to_le32(rss);
 
-	status = be_mbox_notify_wait(adapter);
+	status = be_mcc_notify_wait(adapter);
 	if (!status) {
 		struct be_cmd_resp_eth_rx_create *resp = embedded_payload(wrb);
 		rxq->id = le16_to_cpu(resp->id);
@@ -1022,8 +1025,8 @@ int be_cmd_rxq_create(struct be_adapter *adapter,
 		*rss_id = resp->rss_id;
 	}
 
-	mutex_unlock(&adapter->mbox_lock);
-
+err:
+	spin_unlock_bh(&adapter->mcc_lock);
 	return status;
 }
 
@@ -1078,9 +1081,40 @@ int be_cmd_q_destroy(struct be_adapter *adapter, struct be_queue_info *q,
 	req->id = cpu_to_le16(q->id);
 
 	status = be_mbox_notify_wait(adapter);
+	if (!status)
+		q->created = false;
 
 	mutex_unlock(&adapter->mbox_lock);
+	return status;
+}
 
+/* Uses MCC */
+int be_cmd_rxq_destroy(struct be_adapter *adapter, struct be_queue_info *q)
+{
+	struct be_mcc_wrb *wrb;
+	struct be_cmd_req_q_destroy *req;
+	int status;
+
+	spin_lock_bh(&adapter->mcc_lock);
+
+	wrb = wrb_from_mccq(adapter);
+	if (!wrb) {
+		status = -EBUSY;
+		goto err;
+	}
+	req = embedded_payload(wrb);
+
+	be_wrb_hdr_prepare(wrb, sizeof(*req), true, 0, OPCODE_ETH_RX_DESTROY);
+	be_cmd_hdr_prepare(&req->hdr, CMD_SUBSYSTEM_ETH, OPCODE_ETH_RX_DESTROY,
+		sizeof(*req));
+	req->id = cpu_to_le16(q->id);
+
+	status = be_mcc_notify_wait(adapter);
+	if (!status)
+		q->created = false;
+
+err:
+	spin_unlock_bh(&adapter->mcc_lock);
 	return status;
 }