linux-kernel - [PATCH v16 1/9] nvme-core: Clear any SGL flags in passthru commands

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Date:   Fri, 24 Jul 2020 11:25:12 -0600
From:   Logan Gunthorpe <logang@...tatee.com>
To:     linux-kernel@...r.kernel.org, linux-nvme@...ts.infradead.org
Cc:     Christoph Hellwig <hch@....de>, Sagi Grimberg <sagi@...mberg.me>,
        Keith Busch <kbusch@...nel.org>, Jens Axboe <axboe@...com>,
        Chaitanya Kulkarni <Chaitanya.Kulkarni@....com>,
        Max Gurtovoy <maxg@...lanox.com>,
        Stephen Bates <sbates@...thlin.com>,
        Logan Gunthorpe <logang@...tatee.com>
Subject: [PATCH v16 1/9] nvme-core: Clear any SGL flags in passthru commands

The host driver should decide whether to use SGLs or PRPs and they
currently assume the flags are cleared after the call to
nvme_setup_cmd(). However, passed-through commands may erroneously
set these bits; so clear them for all cases.

Signed-off-by: Logan Gunthorpe <logang@...tatee.com>
Reviewed-by: Sagi Grimberg <sagi@...mberg.me>
---
 drivers/nvme/host/core.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 1d7c7afb1348..6f80bd78eba6 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -593,6 +593,14 @@ static void nvme_assign_write_stream(struct nvme_ctrl *ctrl,
 		req->q->write_hints[streamid] += blk_rq_bytes(req) >> 9;
 }
 
+static void nvme_setup_passthrough(struct request *req,
+		struct nvme_command *cmd)
+{
+	memcpy(cmd, nvme_req(req)->cmd, sizeof(*cmd));
+	/* passthru commands should let the driver set the SGL flags */
+	cmd->common.flags &= ~NVME_CMD_SGL_ALL;
+}
+
 static inline void nvme_setup_flush(struct nvme_ns *ns,
 		struct nvme_command *cmnd)
 {
@@ -758,7 +766,7 @@ blk_status_t nvme_setup_cmd(struct nvme_ns *ns, struct request *req,
 	switch (req_op(req)) {
 	case REQ_OP_DRV_IN:
 	case REQ_OP_DRV_OUT:
-		memcpy(cmd, nvme_req(req)->cmd, sizeof(*cmd));
+		nvme_setup_passthrough(req, cmd);
 		break;
 	case REQ_OP_FLUSH:
 		nvme_setup_flush(ns, cmd);
-- 
2.20.1