nvmet: check that host sqsize does not exceed ctrl MQES

Check that host sqsize is not greater-than Maximum Queue Entries
Supported (MQES) value supported by the controller.

Signed-off-by: Amit Engel <amit.engel@dell.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>

diff --git a/drivers/nvme/target/fabrics-cmd.c b/drivers/nvme/target/fabrics-cmd.c
index 6f14da5..7d0454c 100644 (file)
--- a/drivers/nvme/target/fabrics-cmd.c
+++ b/drivers/nvme/target/fabrics-cmd.c
@@ -109,6 +109,7 @@ static u16 nvmet_install_queue(struct nvmet_ctrl *ctrl, struct nvmet_req *req)
        u16 qid = le16_to_cpu(c->qid);
        u16 sqsize = le16_to_cpu(c->sqsize);
        struct nvmet_ctrl *old;
+       u16 mqes = NVME_CAP_MQES(ctrl->cap);
        u16 ret;
 
        if (!sqsize) {
@@ -125,6 +126,14 @@ static u16 nvmet_install_queue(struct nvmet_ctrl *ctrl, struct nvmet_req *req)
                return NVME_SC_CMD_SEQ_ERROR | NVME_SC_DNR;
        }
 
+       if (sqsize > mqes) {
+               pr_warn("sqsize %u is larger than MQES supported %u cntlid %d\n",
+                               sqsize, mqes, ctrl->cntlid);
+               req->error_loc = offsetof(struct nvmf_connect_command, sqsize);
+               req->cqe->result.u32 = IPO_IATTR_CONNECT_SQE(sqsize);
+               return NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR;
+       }
+
        old = cmpxchg(&req->sq->ctrl, NULL, ctrl);
        if (old) {
                pr_warn("queue already connected!\n");