40 lines
1.3 KiB
Diff
40 lines
1.3 KiB
Diff
From a277f7dbaa54e8ea10f41a7dc4dadec5f08b61b3 Mon Sep 17 00:00:00 2001
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From: "Min Hu (Connor)" <humin29@huawei.com>
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Date: Thu, 28 Oct 2021 19:52:30 +0800
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Subject: [PATCH 17/17] net/hns3: fix mailbox communication with HW
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Mailbox is the communication mechanism between SW and HW. There exist
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two approaches for SW to recognize mailbox message from HW. One way is
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using match_id, the other is to compare the message code. The two
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approaches are independent and used in different scenarios.
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But for the second approach, "next_to_use" should be updated and written
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to HW register. If it not done, HW do not know the position SW steps,
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then, the communication between SW and HW will turn to be failed.
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Fixes: dbbbad23e380 ("net/hns3: fix VF handling LSC event in secondary process")
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Cc: stable@dpdk.org
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Signed-off-by: Min Hu (Connor) <humin29@huawei.com>
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---
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drivers/net/hns3/hns3_mbx.c | 3 +++
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1 file changed, 3 insertions(+)
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diff --git a/drivers/net/hns3/hns3_mbx.c b/drivers/net/hns3/hns3_mbx.c
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index a4d9afc45..3ad85e721 100644
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--- a/drivers/net/hns3/hns3_mbx.c
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+++ b/drivers/net/hns3/hns3_mbx.c
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@@ -435,6 +435,9 @@ hns3_handle_mbx_msg_out_intr(struct hns3_hw *hw)
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scan_next:
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next_to_use = (next_to_use + 1) % hw->cmq.crq.desc_num;
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}
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+
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+ crq->next_to_use = next_to_use;
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+ hns3_write_dev(hw, HNS3_CMDQ_RX_HEAD_REG, crq->next_to_use);
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}
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void
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--
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2.23.0
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