[dpdk-stable] patch 'net/ixgbe: fix Rx queue blocking issue' has been queued to stable release 17.02.1

[Yuanhan Liu]

Hi,

FYI, your patch has been queued to stable release 17.02.1

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 05/28/17. So please
shout if anyone has objections.

Thanks.

	--yliu

---
>From 4e1044f805aa9f31c71ecc18a485036edcefe834 Mon Sep 17 00:00:00 2001
From: Wenzhuo Lu <wenzhuo.lu at intel.com>
Date: Wed, 22 Feb 2017 10:59:35 +0800
Subject: [PATCH] net/ixgbe: fix Rx queue blocking issue

[ upstream commit 9941892b7a457da71ad38c73fbd7e19213fae2bb ]

In the IOV scenario, multi Rx queues can be assigned to one VF.
If the dropping is not enabled, when no descriptors are available
for one queue, this queue can block others.

Fixes: 00e30184daa0 ("ixgbe: add PF support")

Suggested-by: Liang-Min Larry Wang <liang-min.wang at intel.com>
Signed-off-by: Wenzhuo Lu <wenzhuo.lu at intel.com>
---
 drivers/net/ixgbe/ixgbe_pf.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ixgbe/ixgbe_pf.c b/drivers/net/ixgbe/ixgbe_pf.c
index 4715045..d88832e 100644
--- a/drivers/net/ixgbe/ixgbe_pf.c
+++ b/drivers/net/ixgbe/ixgbe_pf.c
@@ -397,15 +397,27 @@ ixgbe_vf_reset_msg(struct rte_eth_dev *dev, uint16_t vf)
 	uint32_t reg_offset, vf_shift;
 	const uint8_t VFRE_SHIFT = 5;  /* VFRE 32 bits per slot */
 	const uint8_t VFRE_MASK = (uint8_t)((1U << VFRE_SHIFT) - 1);
+	uint8_t  nb_q_per_pool;
+	int i;
 
 	vf_shift = vf & VFRE_MASK;
 	reg_offset = (vf >> VFRE_SHIFT) > 0 ? 1 : 0;
 
-	/* enable transmit and receive for vf */
+	/* enable transmit for vf */
 	reg = IXGBE_READ_REG(hw, IXGBE_VFTE(reg_offset));
 	reg |= (reg | (1 << vf_shift));
 	IXGBE_WRITE_REG(hw, IXGBE_VFTE(reg_offset), reg);
 
+	/* enable all queue drop for IOV */
+	nb_q_per_pool = RTE_ETH_DEV_SRIOV(dev).nb_q_per_pool;
+	for (i = vf * nb_q_per_pool; i < (vf + 1) * nb_q_per_pool; i++) {
+		IXGBE_WRITE_FLUSH(hw);
+		reg = IXGBE_QDE_ENABLE | IXGBE_QDE_WRITE;
+		reg |= i << IXGBE_QDE_IDX_SHIFT;
+		IXGBE_WRITE_REG(hw, IXGBE_QDE, reg);
+	}
+
+	/* enable receive for vf */
 	reg = IXGBE_READ_REG(hw, IXGBE_VFRE(reg_offset));
 	reg |= (reg | (1 << vf_shift));
 	IXGBE_WRITE_REG(hw, IXGBE_VFRE(reg_offset), reg);
-- 
1.9.0