[PATCH V2] nvmet: fix compilation errors

[Chaitanya Kulkarni <kch@nvidia.com>]

nvmet_alloc_ctrl() only takes nvmet_alloc_ctrl_args. nvmet_alloc_ctrl
doesn't have nvmet_req argument. In nvmet_alloc_ctrl nvmet_req is
needed when setting up authentication capabilities since call to
nvmet_setup_auth() requires nvmet_req argument which later uses req->sq
to determnine if tls is enabled or not.

That leads to following compilation errors:-

target/fabrics-cmd.c: In function ‘nvmet_execute_admin_connect’:
target/fabrics-cmd.c:318:35: error: too few arguments to function ‘nvmet_connect_result’
      |                       ^~~~~~~~~~~
target/fabrics-cmd.c:237:12: note: declared here
  237 | static u32 nvmet_connect_result(struct nvmet_ctrl *ctrl, struct nvmet_req *req)
      |            ^~~~~~~~~~~~~~~~~~~~
make[4]: *** [/mnt/data/nvme/scripts/Makefile.build:194: target/fabrics-cmd.o] Error 1
make[4]: *** Waiting for unfinished jobs....
target/core.c: In function ‘nvmet_alloc_ctrl’:
target/core.c:1527:37: error: ‘struct nvmet_alloc_ctrl_args’ has no member named ‘req’
 1527 |         struct nvmet_req *req = args->req;
      |                                     ^~
target/core.c:1635:25: error: too few arguments to function ‘nvmet_setup_auth’
 1635 |         dhchap_status = nvmet_setup_auth(ctrl);
      |                         ^~~~~~~~~~~~~~~~
In file included from target/trace.h:19,
                 from target/core.c:16:
target/nvmet.h:879:4: note: declared here
  879 | u8 nvmet_setup_auth(struct nvmet_ctrl *ctrl, struct nvmet_req *req);
      |    ^~~~~~~~~~~~~~~~
target/core.c:1654:17: error: too few arguments to function ‘nvmet_has_auth’
 1654 |                 nvmet_has_auth(ctrl) ? " with DH-HMAC-CHAP" : "");
      |                 ^~~~~~~~~~~~~~
  889 | static inline bool nvmet_has_auth(struct nvmet_ctrl *ctrl, struct nvmet_req *req)
      |                    ^~~~~~~~~~~~~~
target/core.c:1527:27: warning: unused variable ‘req’ [-Wunused-variable]
 1527 |         struct nvmet_req *req = args->req;
      |                           ^~~

Fix these errors with addition of the nvmet_req *req parameter to
nvmet_alloc_ctrl(), new prototype :-

struct nvmet_ctrl *nvmet_alloc_ctrl(struct nvmet_alloc_ctrl_args *args,
				    struct nvmet_req *req);

When nvmet_alloc_ctrl() is called from nvmet_execute_admin_connect() use
nvmet_execute_admin_connect()'s function parameter nvmet_req *req as
a second argument to nvmet_alloc_ctrl() and when nvmet_alloc_ctrl() is
called from nvmet_pci_epf_create_ctrl() pass NULL as a second argument
since as of now we don't have a way to know if pci epf needs nvme target
authentication.

Also, fix the nvmet_has_auth() and nvmet_setup_auth() calls from function
nvmet_alloc_ctrl() by adding the nvmet_req *req argument. Fix the
nvmet_connect_result() call by adding the nvmet_req *req argument. Now
that we have nvmet_req *req argument, remove local variable nvmet_req 
and arg->req assignment, since there is no nvmet_req *req present in the 
struct nvmet_alloc_ctrl_args.

Fixes: 6202783184bf ("nvmet: Improve nvmet_alloc_ctrl() interface and implementation")
Signed-off-by: Chaitanya Kulkarni <kch@nvidia.com>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
---
V2:-

1. Commit log fix :-
   s/nvmet_alloc_ctr/nvmet_alloc_ctrl (Damien)
   s/argumrnt/argument/               (Damien, Bart)
   s/compliation/compilation          (Damien)
2. Add Fixes tag.                     (Jens)
3. Add RB tag and fix the patch subject line.

 drivers/nvme/target/core.c        | 8 ++++----
 drivers/nvme/target/fabrics-cmd.c | 4 ++--
 drivers/nvme/target/nvmet.h       | 6 +++++-
 drivers/nvme/target/pci-epf.c     | 2 +-
 4 files changed, 12 insertions(+), 8 deletions(-)

diff --git a/drivers/nvme/target/core.c b/drivers/nvme/target/core.c
index ef424f7e0ed6..d642d0f40b0a 100644
--- a/drivers/nvme/target/core.c
+++ b/drivers/nvme/target/core.c
@@ -1522,9 +1522,9 @@ static void nvmet_fatal_error_handler(struct work_struct *work)
 	ctrl->ops->delete_ctrl(ctrl);
 }
 
-struct nvmet_ctrl *nvmet_alloc_ctrl(struct nvmet_alloc_ctrl_args *args)
+struct nvmet_ctrl *nvmet_alloc_ctrl(struct nvmet_alloc_ctrl_args *args,
+				    struct nvmet_req *req)
 {
-	struct nvmet_req *req = args->req;
 	struct nvmet_subsys *subsys;
 	struct nvmet_ctrl *ctrl;
 	u32 kato = args->kato;
@@ -1632,7 +1632,7 @@ struct nvmet_ctrl *nvmet_alloc_ctrl(struct nvmet_alloc_ctrl_args *args)
 	if (args->hostid)
 		uuid_copy(&ctrl->hostid, args->hostid);
 
-	dhchap_status = nvmet_setup_auth(ctrl);
+	dhchap_status = nvmet_setup_auth(ctrl, req);
 	if (dhchap_status) {
 		pr_err("Failed to setup authentication, dhchap status %u\n",
 		       dhchap_status);
@@ -1651,7 +1651,7 @@ struct nvmet_ctrl *nvmet_alloc_ctrl(struct nvmet_alloc_ctrl_args *args)
 		nvmet_is_disc_subsys(ctrl->subsys) ? "discovery" : "nvm",
 		ctrl->cntlid, ctrl->subsys->subsysnqn, ctrl->hostnqn,
 		ctrl->pi_support ? " T10-PI is enabled" : "",
-		nvmet_has_auth(ctrl) ? " with DH-HMAC-CHAP" : "");
+		nvmet_has_auth(ctrl, req) ? " with DH-HMAC-CHAP" : "");
 
 	return ctrl;
 
diff --git a/drivers/nvme/target/fabrics-cmd.c b/drivers/nvme/target/fabrics-cmd.c
index d1e03c120893..3b3af19f8aaf 100644
--- a/drivers/nvme/target/fabrics-cmd.c
+++ b/drivers/nvme/target/fabrics-cmd.c
@@ -305,7 +305,7 @@ static void nvmet_execute_admin_connect(struct nvmet_req *req)
 	args.hostid = &d->hostid;
 	args.kato = c->kato;
 
-	ctrl = nvmet_alloc_ctrl(&args);
+	ctrl = nvmet_alloc_ctrl(&args, req);
 	if (!ctrl)
 		goto out;
 
@@ -315,7 +315,7 @@ static void nvmet_execute_admin_connect(struct nvmet_req *req)
 		goto out;
 	}
 
-	args.result = cpu_to_le32(nvmet_connect_result(ctrl));
+	args.result = cpu_to_le32(nvmet_connect_result(ctrl, req));
 out:
 	kfree(d);
 complete:
diff --git a/drivers/nvme/target/nvmet.h b/drivers/nvme/target/nvmet.h
index 845af16561ab..3dcc01da1abe 100644
--- a/drivers/nvme/target/nvmet.h
+++ b/drivers/nvme/target/nvmet.h
@@ -594,7 +594,8 @@ struct nvmet_alloc_ctrl_args {
 	u16			status;
 };
 
-struct nvmet_ctrl *nvmet_alloc_ctrl(struct nvmet_alloc_ctrl_args *args);
+struct nvmet_ctrl *nvmet_alloc_ctrl(struct nvmet_alloc_ctrl_args *args,
+				    struct nvmet_req *req);
 struct nvmet_ctrl *nvmet_ctrl_find_get(const char *subsysnqn,
 				       const char *hostnqn, u16 cntlid,
 				       struct nvmet_req *req);
@@ -888,6 +889,9 @@ int nvmet_auth_ctrl_hash(struct nvmet_req *req, u8 *response,
 			 unsigned int hash_len);
 static inline bool nvmet_has_auth(struct nvmet_ctrl *ctrl, struct nvmet_req *req)
 {
+	if (!req)
+		return false;
+
 	return ctrl->host_key != NULL && !nvmet_queue_tls_keyid(req->sq);
 }
 int nvmet_auth_ctrl_exponential(struct nvmet_req *req,
diff --git a/drivers/nvme/target/pci-epf.c b/drivers/nvme/target/pci-epf.c
index ac30b42cc622..fe7053809308 100644
--- a/drivers/nvme/target/pci-epf.c
+++ b/drivers/nvme/target/pci-epf.c
@@ -2013,7 +2013,7 @@ static int nvmet_pci_epf_create_ctrl(struct nvmet_pci_epf *nvme_epf,
 	args.hostnqn = hostnqn;
 	args.ops = &nvmet_pci_epf_fabrics_ops;
 
-	ctrl->tctrl = nvmet_alloc_ctrl(&args);
+	ctrl->tctrl = nvmet_alloc_ctrl(&args, NULL);
 	if (!ctrl->tctrl) {
 		dev_err(ctrl->dev, "Failed to create target controller\n");
 		ret = -ENOMEM;
-- 
2.40.0