linux-kernel - [PATCH] nvme: fix write zeroes pi

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Message-Id: <20211104181618.864157-1-its@irrelevant.dk>
Date:   Thu,  4 Nov 2021 19:16:18 +0100
From:   Klaus Jensen <its@...elevant.dk>
To:     linux-nvme@...ts.infradead.org
Cc:     Keith Busch <kbusch@...nel.org>, Christoph Hellwig <hch@....de>,
        Jens Axboe <axboe@...com>, Sagi Grimberg <sagi@...mberg.me>,
        linux-kernel@...r.kernel.org, Klaus Jensen <k.jensen@...sung.com>
Subject: [PATCH] nvme: fix write zeroes pi

From: Klaus Jensen <k.jensen@...sung.com>

Write Zeroes sets PRACT when block integrity is enabled (as it should),
but neglects to also set the reftag which is expected by reads. This
causes protection errors on reads.

Fix this by setting the reftag for type 1 and 2 (for type 3, reads will
not check the reftag).

Signed-off-by: Klaus Jensen <k.jensen@...sung.com>
---
 drivers/nvme/host/core.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 3825b596ca16..532bad4de025 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -914,10 +914,15 @@ static inline blk_status_t nvme_setup_write_zeroes(struct nvme_ns *ns,
 		cpu_to_le64(nvme_sect_to_lba(ns, blk_rq_pos(req)));
 	cmnd->write_zeroes.length =
 		cpu_to_le16((blk_rq_bytes(req) >> ns->lba_shift) - 1);
-	if (nvme_ns_has_pi(ns))
+
+	switch (ns->pi_type) {
+	case NVME_NS_DPS_PI_TYPE1:
+	case NVME_NS_DPS_PI_TYPE2:
 		cmnd->write_zeroes.control = cpu_to_le16(NVME_RW_PRINFO_PRACT);
-	else
-		cmnd->write_zeroes.control = 0;
+		cmnd->write_zeroes.reftag = cpu_to_le32(t10_pi_ref_tag(req));
+		break;
+	}
+
 	return BLK_STS_OK;
 }
 
-- 
2.33.1