linux-kernel - [PATCH AUTOSEL for 4.15 080/189] i40e: Fix channel addition in reset flow

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Date:   Mon, 9 Apr 2018 00:17:48 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Amritha Nambiar <amritha.nambiar@...el.com>,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL for 4.15 080/189] i40e: Fix channel addition in reset
 flow

From: Amritha Nambiar <amritha.nambiar@...el.com>

[ Upstream commit bbf0bdd41fbf71a008325bdcf0df63ab088bf532 ]

Fix recreating the channel VSIs during the reset flow to reconfigure
the Tx rings and the queue context associated with the channel VSI.
Also update the next_base_queue for the VSI while rebuilding the
channel VSIs after a reset.

Signed-off-by: Amritha Nambiar <amritha.nambiar@...el.com>
Tested-by: Andrew Bowers <andrewx.bowers@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 drivers/net/ethernet/intel/i40e/i40e_main.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index af792112a2d3..973bad818e81 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -9077,6 +9077,17 @@ static int i40e_rebuild_channels(struct i40e_vsi *vsi)
 				 vsi->uplink_seid);
 			return ret;
 		}
+		/* Reconfigure TX queues using QTX_CTL register */
+		ret = i40e_channel_config_tx_ring(vsi->back, vsi, ch);
+		if (ret) {
+			dev_info(&vsi->back->pdev->dev,
+				 "failed to configure TX rings for channel %u\n",
+				 ch->seid);
+			return ret;
+		}
+		/* update 'next_base_queue' */
+		vsi->next_base_queue = vsi->next_base_queue +
+							ch->num_queue_pairs;
 		if (ch->max_tx_rate) {
 			u64 credits = ch->max_tx_rate;
 
-- 
2.15.1