From: Wyborny, Carolyn <carolyn.wyborny@intel.com>
Date: Tue, 28 Mar 2017 15:00:48 +0000 (-0700)
Subject: i40e: fix for queue timing delays
X-Git-Tag: v4.1.12-117.0_27200813_3~306
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=f772fafd0116fa5e8c58495fb04bcc6acda90815;p=users%2Fjedix%2Flinux-maple.git

i40e: fix for queue timing delays

This patch adds a delay to Rx queue disables to accommodate HW needs.

v2: Added missing check for disable only, additional details on the
need for the ugly delay and fixed spacing on comment.

Change-ID: I2864ca667ce5dcc2cc44f8718113b719742a46a1
Signed-off-by: Carolyn Wyborny <carolyn.wyborny@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

Orabug: 26785018
(cherry picked from commit d08a9f6cd1c8fc58fd57724f45841f77e49e1fa3)
Signed-off-by: Jack Vogel <jack.vogel@oracle.com>
Reviewed-by: Kyle Fortin <kyle.fortin@oracle.com>
---

diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index 458d295767b0..6072622e067f 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -4130,6 +4130,12 @@ static int i40e_vsi_control_rx(struct i40e_vsi *vsi, bool enable)
 		}
 	}
 
+	/* Due to HW errata, on Rx disable only, the register can indicate done
+	 * before it really is. Needs 50ms to be sure
+	 */
+	if (!enable)
+		mdelay(50);
+
 	return ret;
 }