Clean up: There's little chance of contention between the use of
rb_lock and rb_reqslock, so merge the two. This avoids having to
take both in some (possibly future) cases.
Transport tear-down is already serialized, thus there is no need for
locking at all when destroying rpcrdma_reqs.
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
---
net/sunrpc/xprtrdma/backchannel.c | 20 +++-----------------
net/sunrpc/xprtrdma/verbs.c | 31 +++++++++++++++++--------------
net/sunrpc/xprtrdma/xprt_rdma.h | 7 +++----
3 files changed, 23 insertions(+), 35 deletions(-)
diff --git a/net/sunrpc/xprtrdma/backchannel.c b/net/sunrpc/xprtrdma/backchannel.c
index 9cb96a5..af8249b 100644
--- a/net/sunrpc/xprtrdma/backchannel.c
+++ b/net/sunrpc/xprtrdma/backchannel.c
@@ -19,29 +19,16 @@
#undef RPCRDMA_BACKCHANNEL_DEBUG
-static void rpcrdma_bc_free_rqst(struct rpcrdma_xprt *r_xprt,
- struct rpc_rqst *rqst)
-{
- struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
- struct rpcrdma_req *req = rpcr_to_rdmar(rqst);
-
- spin_lock(&buf->rb_reqslock);
- list_del(&req->rl_all);
- spin_unlock(&buf->rb_reqslock);
-
- rpcrdma_destroy_req(req);
-}
-
static int rpcrdma_bc_setup_reqs(struct rpcrdma_xprt *r_xprt,
unsigned int count)
{
struct rpc_xprt *xprt = &r_xprt->rx_xprt;
+ struct rpcrdma_req *req;
struct rpc_rqst *rqst;
unsigned int i;
for (i = 0; i < (count << 1); i++) {
struct rpcrdma_regbuf *rb;
- struct rpcrdma_req *req;
size_t size;
req = rpcrdma_create_req(r_xprt);
@@ -67,7 +54,7 @@ static int rpcrdma_bc_setup_reqs(struct rpcrdma_xprt *r_xprt,
return 0;
out_fail:
- rpcrdma_bc_free_rqst(r_xprt, rqst);
+ rpcrdma_req_destroy(req);
return -ENOMEM;
}
@@ -225,7 +212,6 @@ int xprt_rdma_bc_send_reply(struct rpc_rqst *rqst)
*/
void xprt_rdma_bc_destroy(struct rpc_xprt *xprt, unsigned int reqs)
{
- struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
struct rpc_rqst *rqst, *tmp;
spin_lock(&xprt->bc_pa_lock);
@@ -233,7 +219,7 @@ void xprt_rdma_bc_destroy(struct rpc_xprt *xprt, unsigned int reqs)
list_del(&rqst->rq_bc_pa_list);
spin_unlock(&xprt->bc_pa_lock);
- rpcrdma_bc_free_rqst(r_xprt, rqst);
+ rpcrdma_req_destroy(rpcr_to_rdmar(rqst));
spin_lock(&xprt->bc_pa_lock);
}
diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c
index d68efaf..a6ab216 100644
--- a/net/sunrpc/xprtrdma/verbs.c
+++ b/net/sunrpc/xprtrdma/verbs.c
@@ -1043,9 +1043,9 @@ struct rpcrdma_req *
req->rl_buffer = buffer;
INIT_LIST_HEAD(&req->rl_registered);
- spin_lock(&buffer->rb_reqslock);
+ spin_lock(&buffer->rb_lock);
list_add(&req->rl_all, &buffer->rb_allreqs);
- spin_unlock(&buffer->rb_reqslock);
+ spin_unlock(&buffer->rb_lock);
return req;
}
@@ -1113,7 +1113,6 @@ struct rpcrdma_req *
INIT_LIST_HEAD(&buf->rb_send_bufs);
INIT_LIST_HEAD(&buf->rb_allreqs);
- spin_lock_init(&buf->rb_reqslock);
for (i = 0; i < buf->rb_max_requests; i++) {
struct rpcrdma_req *req;
@@ -1154,9 +1153,18 @@ struct rpcrdma_req *
kfree(rep);
}
+/**
+ * rpcrdma_req_destroy - Destroy an rpcrdma_req object
+ * @req: unused object to be destroyed
+ *
+ * This function assumes that the caller prevents concurrent device
+ * unload and transport tear-down.
+ */
void
-rpcrdma_destroy_req(struct rpcrdma_req *req)
+rpcrdma_req_destroy(struct rpcrdma_req *req)
{
+ list_del(&req->rl_all);
+
rpcrdma_free_regbuf(req->rl_recvbuf);
rpcrdma_free_regbuf(req->rl_sendbuf);
rpcrdma_free_regbuf(req->rl_rdmabuf);
@@ -1214,19 +1222,14 @@ struct rpcrdma_req *
rpcrdma_destroy_rep(rep);
}
- spin_lock(&buf->rb_reqslock);
- while (!list_empty(&buf->rb_allreqs)) {
+ while (!list_empty(&buf->rb_send_bufs)) {
struct rpcrdma_req *req;
- req = list_first_entry(&buf->rb_allreqs,
- struct rpcrdma_req, rl_all);
- list_del(&req->rl_all);
-
- spin_unlock(&buf->rb_reqslock);
- rpcrdma_destroy_req(req);
- spin_lock(&buf->rb_reqslock);
+ req = list_first_entry(&buf->rb_send_bufs,
+ struct rpcrdma_req, rl_list);
+ list_del(&req->rl_list);
+ rpcrdma_req_destroy(req);
}
- spin_unlock(&buf->rb_reqslock);
rpcrdma_mrs_destroy(buf);
}
diff --git a/net/sunrpc/xprtrdma/xprt_rdma.h b/net/sunrpc/xprtrdma/xprt_rdma.h
index 56b299f..6e104cd 100644
--- a/net/sunrpc/xprtrdma/xprt_rdma.h
+++ b/net/sunrpc/xprtrdma/xprt_rdma.h
@@ -392,14 +392,13 @@ struct rpcrdma_buffer {
spinlock_t rb_lock; /* protect buf lists */
struct list_head rb_send_bufs;
struct list_head rb_recv_bufs;
+ struct list_head rb_allreqs;
+
unsigned long rb_flags;
u32 rb_max_requests;
u32 rb_credits; /* most recent credit grant */
u32 rb_bc_srv_max_requests;
- spinlock_t rb_reqslock; /* protect rb_allreqs */
- struct list_head rb_allreqs;
-
u32 rb_bc_max_requests;
struct workqueue_struct *rb_completion_wq;
@@ -522,7 +521,7 @@ int rpcrdma_ep_post(struct rpcrdma_ia *, struct rpcrdma_ep *,
* Buffer calls - xprtrdma/verbs.c
*/
struct rpcrdma_req *rpcrdma_create_req(struct rpcrdma_xprt *);
-void rpcrdma_destroy_req(struct rpcrdma_req *);
+void rpcrdma_req_destroy(struct rpcrdma_req *req);
int rpcrdma_buffer_create(struct rpcrdma_xprt *);
void rpcrdma_buffer_destroy(struct rpcrdma_buffer *);
struct rpcrdma_sendctx *rpcrdma_sendctx_get_locked(struct rpcrdma_buffer *buf);
