dpdk/dpdk-16.04_patches/0024-net-enic-fix-Rx-scatter-with-multiple-queues.patch

From 658069b0c5994e260cd7d0a7dfc7f03d78dd4f5a Mon Sep 17 00:00:00 2001
From: Nelson Escobar <neescoba@cisco.com>
Date: Tue, 28 Jun 2016 11:49:11 -0700
Subject: [PATCH 24/25] net/enic: fix Rx scatter with multiple queues

The Rx scatter patch failed to make a few changes and resulted in
problems when using multiple receive queues (RQs) in DPDK (ie RSS)
since the wrong adapter resources were being used.

- get and use the correct completion queue index associated with a
  receive queue.
- set the correct receive queue index when using RSS

Fixes: 856d7ba7ed22 ("net/enic: support scattered Rx")

Signed-off-by: Nelson Escobar <neescoba@cisco.com>
Reviewed-by: John Daley <johndale@cisco.com>
---
 drivers/net/enic/enic.h      |  6 +++++-
 drivers/net/enic/enic_main.c | 10 ++++++----
 2 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/drivers/net/enic/enic.h b/drivers/net/enic/enic.h
index 175adb8..8b0fa05 100644
--- a/drivers/net/enic/enic.h
+++ b/drivers/net/enic/enic.h
@@ -165,7 +165,11 @@ static inline unsigned int enic_data_rq(__rte_unused struct enic *enic, unsigned
 
 static inline unsigned int enic_cq_rq(__rte_unused struct enic *enic, unsigned int rq)
 {
-	return rq;
+	/* Scatter rx uses two receive queues together with one
+	 * completion queue, so the completion queue number is no
+	 * longer the same as the rq number.
+	 */
+	return rq / 2;
 }
 
 static inline unsigned int enic_cq_wq(struct enic *enic, unsigned int wq)
diff --git a/drivers/net/enic/enic_main.c b/drivers/net/enic/enic_main.c
index 0547f3b..976c9da 100644
--- a/drivers/net/enic/enic_main.c
+++ b/drivers/net/enic/enic_main.c
@@ -252,19 +252,20 @@ void enic_init_vnic_resources(struct enic *enic)
 	vnic_dev_stats_clear(enic->vdev);
 
 	for (index = 0; index < enic->rq_count; index++) {
+		cq_idx = enic_cq_rq(enic, enic_sop_rq(enic, index));
+
 		vnic_rq_init(&enic->rq[enic_sop_rq(enic, index)],
-			enic_cq_rq(enic, index),
+			cq_idx,
 			error_interrupt_enable,
 			error_interrupt_offset);
 
 		data_rq = &enic->rq[enic_data_rq(enic, index)];
 		if (data_rq->in_use) 
 			vnic_rq_init(data_rq,
-				     enic_cq_rq(enic, index),
+				     cq_idx,
 				     error_interrupt_enable,
 				     error_interrupt_offset);
 
-		cq_idx = enic_cq_rq(enic, index);
 		vnic_cq_init(&enic->cq[cq_idx],
 			0 /* flow_control_enable */,
 			1 /* color_enable */,
@@ -896,7 +897,8 @@ static int enic_set_rsscpu(struct enic *enic, u8 rss_hash_bits)
 		return -ENOMEM;
 
 	for (i = 0; i < (1 << rss_hash_bits); i++)
-		(*rss_cpu_buf_va).cpu[i/4].b[i%4] = i % enic->rq_count;
+		(*rss_cpu_buf_va).cpu[i / 4].b[i % 4] =
+			enic_sop_rq(enic, i % enic->rq_count);
 
 	err = enic_set_rss_cpu(enic,
 		rss_cpu_buf_pa,
-- 
2.7.0