qed: Add Multi-TC RoCE support

RoCE qps use a pair of physical queues (pq) received from the Queue Manager
(QM) - an offload queue (OFLD) and a low latency queue (LLT). The QM block
creates a pq for each TC, and allows RoCE qps to ask for a pq with a
specific TC. As a result, qps with different VLAN priorities can be mapped
to different TCs, and employ features such as PFC and ETS.

Signed-off-by: Michal Kalderon <michal.kalderon@cavium.com>
Signed-off-by: Ariel Elior <ariel.elior@cavium.com>
Signed-off-by: Denis Bolotin <denis.bolotin@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 38 insertions, 16 deletions

diff --git a/drivers/net/ethernet/qlogic/qed/qed_roce.c b/drivers/net/ethernet/qlogic/qed/qed_roce.c
index ada4c1810864..7d7a64c55ff1 100644
--- a/drivers/net/ethernet/qlogic/qed/qed_roce.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_roce.c
@@ -44,8 +44,10 @@
 #include <linux/slab.h>
 #include <linux/spinlock.h>
 #include <linux/string.h>
+#include <linux/if_vlan.h>
 #include "qed.h"
 #include "qed_cxt.h"
+#include "qed_dcbx.h"
 #include "qed_hsi.h"
 #include "qed_hw.h"
 #include "qed_init_ops.h"
@@ -231,16 +233,33 @@ static void qed_roce_set_real_cid(struct qed_hwfn *p_hwfn, u32 cid)
 	spin_unlock_bh(&p_hwfn->p_rdma_info->lock);
 }
 
+static u8 qed_roce_get_qp_tc(struct qed_hwfn *p_hwfn, struct qed_rdma_qp *qp)
+{
+	u8 pri, tc = 0;
+
+	if (qp->vlan_id) {
+		pri = (qp->vlan_id & VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
+		tc = qed_dcbx_get_priority_tc(p_hwfn, pri);
+	}
+
+	DP_VERBOSE(p_hwfn, QED_MSG_SP,
+		   "qp icid %u tc: %u (vlan priority %s)\n",
+		   qp->icid, tc, qp->vlan_id ? "enabled" : "disabled");
+
+	return tc;
+}
+
 static int qed_roce_sp_create_responder(struct qed_hwfn *p_hwfn,
 					struct qed_rdma_qp *qp)
 {
 	struct roce_create_qp_resp_ramrod_data *p_ramrod;
+	u16 regular_latency_queue, low_latency_queue;
 	struct qed_sp_init_data init_data;
 	enum roce_flavor roce_flavor;
 	struct qed_spq_entry *p_ent;
-	u16 regular_latency_queue;
 	enum protocol_type proto;
 	int rc;
+	u8 tc;
 
 	DP_VERBOSE(p_hwfn, QED_MSG_RDMA, "icid = %08x\n", qp->icid);
 
@@ -324,12 +343,17 @@ static int qed_roce_sp_create_responder(struct qed_hwfn *p_hwfn,
 	p_ramrod->cq_cid = cpu_to_le32((p_hwfn->hw_info.opaque_fid << 16) |
 				       qp->rq_cq_id);
 
-	regular_latency_queue = qed_get_cm_pq_idx(p_hwfn, PQ_FLAGS_OFLD);
-
+	tc = qed_roce_get_qp_tc(p_hwfn, qp);
+	regular_latency_queue = qed_get_cm_pq_idx_ofld_mtc(p_hwfn, tc);
+	low_latency_queue = qed_get_cm_pq_idx_llt_mtc(p_hwfn, tc);
+	DP_VERBOSE(p_hwfn, QED_MSG_SP,
+		   "qp icid %u pqs: regular_latency %u low_latency %u\n",
+		   qp->icid, regular_latency_queue - CM_TX_PQ_BASE,
+		   low_latency_queue - CM_TX_PQ_BASE);
 	p_ramrod->regular_latency_phy_queue =
 	    cpu_to_le16(regular_latency_queue);
 	p_ramrod->low_latency_phy_queue =
-	    cpu_to_le16(regular_latency_queue);
+	    cpu_to_le16(low_latency_queue);
 
 	p_ramrod->dpi = cpu_to_le16(qp->dpi);
 
@@ -345,11 +369,6 @@ static int qed_roce_sp_create_responder(struct qed_hwfn *p_hwfn,
 				     qp->stats_queue;
 
 	rc = qed_spq_post(p_hwfn, p_ent, NULL);
-
-	DP_VERBOSE(p_hwfn, QED_MSG_RDMA,
-		   "rc = %d regular physical queue = 0x%x\n", rc,
-		   regular_latency_queue);
-
 	if (rc)
 		goto err;
 
@@ -375,12 +394,13 @@ static int qed_roce_sp_create_requester(struct qed_hwfn *p_hwfn,
 					struct qed_rdma_qp *qp)
 {
 	struct roce_create_qp_req_ramrod_data *p_ramrod;
+	u16 regular_latency_queue, low_latency_queue;
 	struct qed_sp_init_data init_data;
 	enum roce_flavor roce_flavor;
 	struct qed_spq_entry *p_ent;
-	u16 regular_latency_queue;
 	enum protocol_type proto;
 	int rc;
+	u8 tc;
 
 	DP_VERBOSE(p_hwfn, QED_MSG_RDMA, "icid = %08x\n", qp->icid);
 
@@ -453,12 +473,17 @@ static int qed_roce_sp_create_requester(struct qed_hwfn *p_hwfn,
 	p_ramrod->cq_cid =
 	    cpu_to_le32((p_hwfn->hw_info.opaque_fid << 16) | qp->sq_cq_id);
 
-	regular_latency_queue = qed_get_cm_pq_idx(p_hwfn, PQ_FLAGS_OFLD);
-
+	tc = qed_roce_get_qp_tc(p_hwfn, qp);
+	regular_latency_queue = qed_get_cm_pq_idx_ofld_mtc(p_hwfn, tc);
+	low_latency_queue = qed_get_cm_pq_idx_llt_mtc(p_hwfn, tc);
+	DP_VERBOSE(p_hwfn, QED_MSG_SP,
+		   "qp icid %u pqs: regular_latency %u low_latency %u\n",
+		   qp->icid, regular_latency_queue - CM_TX_PQ_BASE,
+		   low_latency_queue - CM_TX_PQ_BASE);
 	p_ramrod->regular_latency_phy_queue =
 	    cpu_to_le16(regular_latency_queue);
 	p_ramrod->low_latency_phy_queue =
-	    cpu_to_le16(regular_latency_queue);
+	    cpu_to_le16(low_latency_queue);
 
 	p_ramrod->dpi = cpu_to_le16(qp->dpi);
 
@@ -471,9 +496,6 @@ static int qed_roce_sp_create_requester(struct qed_hwfn *p_hwfn,
 				     qp->stats_queue;
 
 	rc = qed_spq_post(p_hwfn, p_ent, NULL);
-
-	DP_VERBOSE(p_hwfn, QED_MSG_RDMA, "rc = %d\n", rc);
-
 	if (rc)
 		goto err;