nvme: return the whole CQE through the request passthrough interface

Both LighNVM and NVMe over Fabrics need to look at more than just the
status and result field.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Matias Bj?rling <m@bjorling.me>
Reviewed-by: Jay Freyensee <james.p.freyensee@intel.com>
Reviewed-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Sagi Grimberg <sagig@mellanox.com>
Reviewed-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

3 files changed, 24 insertions, 17 deletions

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 07b7ec699e92..66fd3d9e4d47 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -132,7 +132,6 @@ struct request *nvme_alloc_request(struct request_queue *q,
 
         req->cmd = (unsigned char *)cmd;
         req->cmd_len = sizeof(struct nvme_command);
-        req->special = (void *)0;
 
         return req;
 }
@@ -143,7 +142,8 @@ EXPORT_SYMBOL_GPL(nvme_alloc_request);
  * if the result is positive, it's an NVM Express status code
  */
 int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
-                void *buffer, unsigned bufflen, u32 *result, unsigned timeout)
+                struct nvme_completion *cqe, void *buffer, unsigned bufflen,
+                unsigned timeout)
 {
         struct request *req;
         int ret;
@@ -153,6 +153,7 @@ int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
                 return PTR_ERR(req);
 
         req->timeout = timeout ? timeout : ADMIN_TIMEOUT;
+        req->special = cqe;
 
         if (buffer && bufflen) {
                 ret = blk_rq_map_kern(q, req, buffer, bufflen, GFP_KERNEL);
@@ -161,8 +162,6 @@ int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
         }
 
         blk_execute_rq(req->q, NULL, req, 0);
-        if (result)
-                *result = (u32)(uintptr_t)req->special;
         ret = req->errors;
  out:
         blk_mq_free_request(req);
@@ -172,7 +171,7 @@ int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
 int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
                 void *buffer, unsigned bufflen)
 {
-        return __nvme_submit_sync_cmd(q, cmd, buffer, bufflen, NULL, 0);
+        return __nvme_submit_sync_cmd(q, cmd, NULL, buffer, bufflen, 0);
 }
 EXPORT_SYMBOL_GPL(nvme_submit_sync_cmd);
 
@@ -182,6 +181,7 @@ int __nvme_submit_user_cmd(struct request_queue *q, struct nvme_command *cmd,
                 u32 *result, unsigned timeout)
 {
         bool write = cmd->common.opcode & 1;
+        struct nvme_completion cqe;
         struct nvme_ns *ns = q->queuedata;
         struct gendisk *disk = ns ? ns->disk : NULL;
         struct request *req;
@@ -194,6 +194,7 @@ int __nvme_submit_user_cmd(struct request_queue *q, struct nvme_command *cmd,
                 return PTR_ERR(req);
 
         req->timeout = timeout ? timeout : ADMIN_TIMEOUT;
+        req->special = &cqe;
 
         if (ubuffer && bufflen) {
                 ret = blk_rq_map_user(q, req, NULL, ubuffer, bufflen,
@@ -248,7 +249,7 @@ int __nvme_submit_user_cmd(struct request_queue *q, struct nvme_command *cmd,
         blk_execute_rq(req->q, disk, req, 0);
         ret = req->errors;
         if (result)
-                *result = (u32)(uintptr_t)req->special;
+                *result = le32_to_cpu(cqe.result);
         if (meta && !ret && !write) {
                 if (copy_to_user(meta_buffer, meta, meta_len))
                         ret = -EFAULT;
@@ -329,6 +330,8 @@ int nvme_get_features(struct nvme_ctrl *dev, unsigned fid, unsigned nsid,
                                         dma_addr_t dma_addr, u32 *result)
 {
         struct nvme_command c;
+        struct nvme_completion cqe;
+        int ret;
 
         memset(&c, 0, sizeof(c));
         c.features.opcode = nvme_admin_get_features;
@@ -336,13 +339,18 @@ int nvme_get_features(struct nvme_ctrl *dev, unsigned fid, unsigned nsid,
         c.features.prp1 = cpu_to_le64(dma_addr);
         c.features.fid = cpu_to_le32(fid);
 
-        return __nvme_submit_sync_cmd(dev->admin_q, &c, NULL, 0, result, 0);
+        ret = __nvme_submit_sync_cmd(dev->admin_q, &c, &cqe, NULL, 0, 0);
+        if (ret >= 0)
+                *result = le32_to_cpu(cqe.result);
+        return ret;
 }
 
 int nvme_set_features(struct nvme_ctrl *dev, unsigned fid, unsigned dword11,
                                         dma_addr_t dma_addr, u32 *result)
 {
         struct nvme_command c;
+        struct nvme_completion cqe;
+        int ret;
 
         memset(&c, 0, sizeof(c));
         c.features.opcode = nvme_admin_set_features;
@@ -350,7 +358,10 @@ int nvme_set_features(struct nvme_ctrl *dev, unsigned fid, unsigned dword11,
         c.features.fid = cpu_to_le32(fid);
         c.features.dword11 = cpu_to_le32(dword11);
 
-        return __nvme_submit_sync_cmd(dev->admin_q, &c, NULL, 0, result, 0);
+        ret = __nvme_submit_sync_cmd(dev->admin_q, &c, &cqe, NULL, 0, 0);
+        if (ret >= 0)
+                *result = le32_to_cpu(cqe.result);
+        return ret;
 }
 
 int nvme_get_log_page(struct nvme_ctrl *dev, struct nvme_smart_log **log)
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index 63ba8a500ee1..2ac7539fdd17 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -248,7 +248,8 @@ void nvme_requeue_req(struct request *req);
 int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
                 void *buf, unsigned bufflen);
 int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
-                void *buffer, unsigned bufflen,  u32 *result, unsigned timeout);
+                struct nvme_completion *cqe, void *buffer, unsigned bufflen,
+                unsigned timeout);
 int nvme_submit_user_cmd(struct request_queue *q, struct nvme_command *cmd,
                 void __user *ubuffer, unsigned bufflen, u32 *result,
                 unsigned timeout);
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index a62336051178..d47b08783110 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -748,10 +748,8 @@ static void __nvme_process_cq(struct nvme_queue *nvmeq, unsigned int *tag)
                 }
 
                 req = blk_mq_tag_to_rq(*nvmeq->tags, cqe.command_id);
-                if (req->cmd_type == REQ_TYPE_DRV_PRIV) {
-                        u32 result = le32_to_cpu(cqe.result);
-                        req->special = (void *)(uintptr_t)result;
-                }
+                if (req->cmd_type == REQ_TYPE_DRV_PRIV && req->special)
+                        memcpy(req->special, &cqe, sizeof(cqe));
                 blk_mq_complete_request(req, status >> 1);
 
         }
@@ -901,13 +899,10 @@ static void abort_endio(struct request *req, int error)
 {
         struct nvme_iod *iod = blk_mq_rq_to_pdu(req);
         struct nvme_queue *nvmeq = iod->nvmeq;
-        u32 result = (u32)(uintptr_t)req->special;
         u16 status = req->errors;
 
-        dev_warn(nvmeq->dev->ctrl.device,
-                "Abort status:%x result:%x", status, result);
+        dev_warn(nvmeq->dev->ctrl.device, "Abort status: 0x%x", status);
         atomic_inc(&nvmeq->dev->ctrl.abort_limit);
-
         blk_mq_free_request(req);
 }