[dpdk-dev] [PATCH] net/ixgbe: fix probability of obtaining mailbox lock failure

[Qiming Chen <chenqiming_huawei@163.com>]

Ifconfig pf port up/down, after several times, the dpdk vf driver may fail
to obtain the mailbox lock, resulting in configuration failure and
functional failure. In order to increase the reliability of mailbox
communication, the patch uses a trial strategy.

Fixes: abf7275bbaa2 ("ixgbe: move to drivers/net/")
Cc: stable@dpdk.org

Signed-off-by: Qiming Chen <chenqiming_huawei@163.com>
---
 drivers/net/ixgbe/base/ixgbe_mbx.c | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ixgbe/base/ixgbe_mbx.c b/drivers/net/ixgbe/base/ixgbe_mbx.c
index 4dddff2c58..5a14fcc7b4 100644
--- a/drivers/net/ixgbe/base/ixgbe_mbx.c
+++ b/drivers/net/ixgbe/base/ixgbe_mbx.c
@@ -370,15 +370,23 @@ STATIC s32 ixgbe_check_for_rst_vf(struct ixgbe_hw *hw, u16 mbx_id)
 STATIC s32 ixgbe_obtain_mbx_lock_vf(struct ixgbe_hw *hw)
 {
 	s32 ret_val = IXGBE_ERR_MBX;
+	s32 timeout = hw->mbx.timeout;
+	s32 usec = hw->mbx.usec_delay;
 
 	DEBUGFUNC("ixgbe_obtain_mbx_lock_vf");
 
-	/* Take ownership of the buffer */
-	IXGBE_WRITE_REG(hw, IXGBE_VFMAILBOX, IXGBE_VFMAILBOX_VFU);
+	do {
+		/* Take ownership of the buffer */
+		IXGBE_WRITE_REG(hw, IXGBE_VFMAILBOX, IXGBE_VFMAILBOX_VFU);
 
-	/* reserve mailbox for vf use */
-	if (ixgbe_read_v2p_mailbox(hw) & IXGBE_VFMAILBOX_VFU)
-		ret_val = IXGBE_SUCCESS;
+		/* reserve mailbox for vf use */
+		if (ixgbe_read_v2p_mailbox(hw) & IXGBE_VFMAILBOX_VFU) {
+			ret_val = IXGBE_SUCCESS;
+			break;
+		}
+
+		usec_delay(usec);
+	} while (timeout--);
 
 	return ret_val;
 }
-- 
2.30.1.windows.1