From: Gavin Hu <gavin.hu@arm.com>
To: dev@dpdk.org
Cc: nd@arm.com, thomas@monjalon.net, bruce.richardson@intel.com,
yong.liu@intel.com, yinan.wang@intel.com,
ajit.khaparde@broadcom.com, somnath.kotur@broadcom.com,
Honnappa.Nagarahalli@arm.com, ruifeng.wang@arm.com,
steve.capper@arm.com, stable@dpdk.org
Subject: [dpdk-stable] [PATCH v2 5/5] net/bnxt: enforce io barrier for doorbell command
Date: Mon, 16 Sep 2019 19:27:18 +0800 [thread overview]
Message-ID: <1568633238-47888-6-git-send-email-gavin.hu@arm.com> (raw)
In-Reply-To: <1568633238-47888-1-git-send-email-gavin.hu@arm.com>
In-Reply-To: <1567751873-15964-1-git-send-email-gavin.hu@arm.com>
The doorbell ringing operation requires a rte_io_mb immediately to make
the command complete and visible to the device before reading the
response, otherwise it may read stale or invalid responses.
Fixes: ca241d9a0952 ("net/bnxt: use I/O device memory read/write API")
Cc: stable@dpdk.org
Signed-off-by: Gavin Hu <gavin.hu@arm.com>
---
drivers/net/bnxt/bnxt_hwrm.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/net/bnxt/bnxt_hwrm.c b/drivers/net/bnxt/bnxt_hwrm.c
index 2d5dc00..7d192e3 100644
--- a/drivers/net/bnxt/bnxt_hwrm.c
+++ b/drivers/net/bnxt/bnxt_hwrm.c
@@ -134,6 +134,12 @@ static int bnxt_hwrm_send_message(struct bnxt *bp, void *msg,
/* Ring channel doorbell */
bar = (uint8_t *)bp->bar0 + mb_trigger_offset;
rte_write32(1, bar);
+ /*
+ * Make sure the channel doorbell ring command complete before
+ * reading the response to avoid getting stale or invalid
+ * responses.
+ */
+ rte_io_mb();
/* Poll for the valid bit */
for (i = 0; i < HWRM_CMD_TIMEOUT; i++) {
--
2.7.4
next prev parent reply other threads:[~2019-09-16 11:27 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1568633238-47888-1-git-send-email-gavin.hu@arm.com>
2019-09-06 6:37 ` [dpdk-stable] [PATCH] net/bnxt: fix memory barriers Gavin Hu
2019-09-16 11:27 ` [dpdk-stable] [PATCH v2 3/5] net/bnxt: remove duplicate barrier Gavin Hu
2019-09-17 1:55 ` Ajit Khaparde
2019-09-16 11:27 ` [dpdk-stable] [PATCH v2 4/5] net/bnxt: replace with cio barrier for doorbell resp Gavin Hu
2019-09-17 1:56 ` Ajit Khaparde
2019-09-16 11:27 ` Gavin Hu [this message]
2019-09-17 1:55 ` [dpdk-stable] [PATCH v2 5/5] net/bnxt: enforce io barrier for doorbell command Ajit Khaparde
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