This simplifies allocation of the generic RPC slot and xprtrdma
specific per-RPC resources.
It also makes xprtrdma more like the socket-based transports:
->buf_alloc and ->buf_free are now responsible only for send and
receive buffers.
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
---
include/linux/sunrpc/xprt.h | 1
net/sunrpc/xprtrdma/backchannel.c | 77 +++++++++++++++++--------------------
net/sunrpc/xprtrdma/transport.c | 35 ++++-------------
net/sunrpc/xprtrdma/xprt_rdma.h | 9 +---
4 files changed, 46 insertions(+), 76 deletions(-)
diff --git a/include/linux/sunrpc/xprt.h b/include/linux/sunrpc/xprt.h
index 706eef1..336fd1a 100644
--- a/include/linux/sunrpc/xprt.h
+++ b/include/linux/sunrpc/xprt.h
@@ -84,7 +84,6 @@ struct rpc_rqst {
void (*rq_release_snd_buf)(struct rpc_rqst *); /* release rq_enc_pages */
struct list_head rq_list;
- void *rq_xprtdata; /* Per-xprt private data */
void *rq_buffer; /* Call XDR encode buffer */
size_t rq_callsize;
void *rq_rbuffer; /* Reply XDR decode buffer */
diff --git a/net/sunrpc/xprtrdma/backchannel.c b/net/sunrpc/xprtrdma/backchannel.c
index 47ebac9..4034788 100644
--- a/net/sunrpc/xprtrdma/backchannel.c
+++ b/net/sunrpc/xprtrdma/backchannel.c
@@ -29,29 +29,41 @@ static void rpcrdma_bc_free_rqst(struct rpcrdma_xprt *r_xprt,
spin_unlock(&buf->rb_reqslock);
rpcrdma_destroy_req(req);
-
- kfree(rqst);
}
-static int rpcrdma_bc_setup_rqst(struct rpcrdma_xprt *r_xprt,
- struct rpc_rqst *rqst)
+static int rpcrdma_bc_setup_reqs(struct rpcrdma_xprt *r_xprt,
+ unsigned int count)
{
- struct rpcrdma_regbuf *rb;
- struct rpcrdma_req *req;
- size_t size;
+ struct rpc_xprt *xprt = &r_xprt->rx_xprt;
+ 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);
+ if (IS_ERR(req))
+ return PTR_ERR(req);
+ rqst = &req->rl_slot;
+
+ rqst->rq_xprt = xprt;
+ INIT_LIST_HEAD(&rqst->rq_list);
+ INIT_LIST_HEAD(&rqst->rq_bc_list);
+ __set_bit(RPC_BC_PA_IN_USE, &rqst->rq_bc_pa_state);
+ spin_lock_bh(&xprt->bc_pa_lock);
+ list_add(&rqst->rq_bc_pa_list, &xprt->bc_pa_list);
+ spin_unlock_bh(&xprt->bc_pa_lock);
- req = rpcrdma_create_req(r_xprt);
- if (IS_ERR(req))
- return PTR_ERR(req);
-
- size = r_xprt->rx_data.inline_rsize;
- rb = rpcrdma_alloc_regbuf(size, DMA_TO_DEVICE, GFP_KERNEL);
- if (IS_ERR(rb))
- goto out_fail;
- req->rl_sendbuf = rb;
- xdr_buf_init(&rqst->rq_snd_buf, rb->rg_base,
- min_t(size_t, size, PAGE_SIZE));
- rpcrdma_set_xprtdata(rqst, req);
+ size = r_xprt->rx_data.inline_rsize;
+ rb = rpcrdma_alloc_regbuf(size, DMA_TO_DEVICE, GFP_KERNEL);
+ if (IS_ERR(rb))
+ goto out_fail;
+ req->rl_sendbuf = rb;
+ xdr_buf_init(&rqst->rq_snd_buf, rb->rg_base,
+ min_t(size_t, size, PAGE_SIZE));
+ }
return 0;
out_fail:
@@ -86,9 +98,6 @@ static int rpcrdma_bc_setup_reps(struct rpcrdma_xprt *r_xprt,
int xprt_rdma_bc_setup(struct rpc_xprt *xprt, unsigned int reqs)
{
struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
- struct rpcrdma_buffer *buffer = &r_xprt->rx_buf;
- struct rpc_rqst *rqst;
- unsigned int i;
int rc;
/* The backchannel reply path returns each rpc_rqst to the
@@ -103,25 +112,9 @@ int xprt_rdma_bc_setup(struct rpc_xprt *xprt, unsigned int reqs)
if (reqs > RPCRDMA_BACKWARD_WRS >> 1)
goto out_err;
- for (i = 0; i < (reqs << 1); i++) {
- rqst = kzalloc(sizeof(*rqst), GFP_KERNEL);
- if (!rqst)
- goto out_free;
-
- dprintk("RPC: %s: new rqst %p\n", __func__, rqst);
-
- rqst->rq_xprt = &r_xprt->rx_xprt;
- INIT_LIST_HEAD(&rqst->rq_list);
- INIT_LIST_HEAD(&rqst->rq_bc_list);
- __set_bit(RPC_BC_PA_IN_USE, &rqst->rq_bc_pa_state);
-
- if (rpcrdma_bc_setup_rqst(r_xprt, rqst))
- goto out_free;
-
- spin_lock_bh(&xprt->bc_pa_lock);
- list_add(&rqst->rq_bc_pa_list, &xprt->bc_pa_list);
- spin_unlock_bh(&xprt->bc_pa_lock);
- }
+ rc = rpcrdma_bc_setup_reqs(r_xprt, reqs);
+ if (rc)
+ goto out_free;
rc = rpcrdma_bc_setup_reps(r_xprt, reqs);
if (rc)
@@ -131,7 +124,7 @@ int xprt_rdma_bc_setup(struct rpc_xprt *xprt, unsigned int reqs)
if (rc)
goto out_free;
- buffer->rb_bc_srv_max_requests = reqs;
+ r_xprt->rx_buf.rb_bc_srv_max_requests = reqs;
request_module("svcrdma");
trace_xprtrdma_cb_setup(r_xprt, reqs);
return 0;
diff --git a/net/sunrpc/xprtrdma/transport.c b/net/sunrpc/xprtrdma/transport.c
index 8f9338e..79885aa 100644
--- a/net/sunrpc/xprtrdma/transport.c
+++ b/net/sunrpc/xprtrdma/transport.c
@@ -331,9 +331,7 @@
return ERR_PTR(-EBADF);
}
- xprt = xprt_alloc(args->net, sizeof(struct rpcrdma_xprt),
- xprt_rdma_slot_table_entries,
- xprt_rdma_slot_table_entries);
+ xprt = xprt_alloc(args->net, sizeof(struct rpcrdma_xprt), 0, 0);
if (xprt == NULL) {
dprintk("RPC: %s: couldn't allocate rpcrdma_xprt\n",
__func__);
@@ -365,7 +363,7 @@
xprt_set_bound(xprt);
xprt_rdma_format_addresses(xprt, sap);
- cdata.max_requests = xprt->max_reqs;
+ cdata.max_requests = xprt_rdma_slot_table_entries;
cdata.rsize = RPCRDMA_MAX_SEGS * PAGE_SIZE; /* RDMA write max */
cdata.wsize = RPCRDMA_MAX_SEGS * PAGE_SIZE; /* RDMA read max */
@@ -550,22 +548,18 @@
static void
xprt_rdma_alloc_slot(struct rpc_xprt *xprt, struct rpc_task *task)
{
- struct rpc_rqst *rqst;
+ struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
+ struct rpcrdma_req *req;
- spin_lock(&xprt->reserve_lock);
- if (list_empty(&xprt->free))
+ req = rpcrdma_buffer_get(&r_xprt->rx_buf);
+ if (!req)
goto out_sleep;
- rqst = list_first_entry(&xprt->free, struct rpc_rqst, rq_list);
- list_del(&rqst->rq_list);
- spin_unlock(&xprt->reserve_lock);
-
- task->tk_rqstp = rqst;
+ task->tk_rqstp = &req->rl_slot;
task->tk_status = 0;
return;
out_sleep:
rpc_sleep_on(&xprt->backlog, task, NULL);
- spin_unlock(&xprt->reserve_lock);
task->tk_status = -EAGAIN;
}
@@ -579,11 +573,8 @@
xprt_rdma_free_slot(struct rpc_xprt *xprt, struct rpc_rqst *rqst)
{
memset(rqst, 0, sizeof(*rqst));
-
- spin_lock(&xprt->reserve_lock);
- list_add(&rqst->rq_list, &xprt->free);
+ rpcrdma_buffer_put(rpcr_to_rdmar(rqst));
rpc_wake_up_next(&xprt->backlog);
- spin_unlock(&xprt->reserve_lock);
}
static bool
@@ -656,13 +647,9 @@
{
struct rpc_rqst *rqst = task->tk_rqstp;
struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(rqst->rq_xprt);
- struct rpcrdma_req *req;
+ struct rpcrdma_req *req = rpcr_to_rdmar(rqst);
gfp_t flags;
- req = rpcrdma_buffer_get(&r_xprt->rx_buf);
- if (req == NULL)
- goto out_get;
-
flags = RPCRDMA_DEF_GFP;
if (RPC_IS_SWAPPER(task))
flags = __GFP_MEMALLOC | GFP_NOWAIT | __GFP_NOWARN;
@@ -672,15 +659,12 @@
if (!rpcrdma_get_recvbuf(r_xprt, req, rqst->rq_rcvsize, flags))
goto out_fail;
- rpcrdma_set_xprtdata(rqst, req);
rqst->rq_buffer = req->rl_sendbuf->rg_base;
rqst->rq_rbuffer = req->rl_recvbuf->rg_base;
trace_xprtrdma_allocate(task, req);
return 0;
out_fail:
- rpcrdma_buffer_put(req);
-out_get:
trace_xprtrdma_allocate(task, NULL);
return -ENOMEM;
}
@@ -701,7 +685,6 @@
if (test_bit(RPCRDMA_REQ_F_PENDING, &req->rl_flags))
rpcrdma_release_rqst(r_xprt, req);
trace_xprtrdma_rpc_done(task, req);
- rpcrdma_buffer_put(req);
}
/**
diff --git a/net/sunrpc/xprtrdma/xprt_rdma.h b/net/sunrpc/xprtrdma/xprt_rdma.h
index e83ba758..765e4df 100644
--- a/net/sunrpc/xprtrdma/xprt_rdma.h
+++ b/net/sunrpc/xprtrdma/xprt_rdma.h
@@ -335,6 +335,7 @@ enum {
struct rpcrdma_buffer;
struct rpcrdma_req {
struct list_head rl_list;
+ struct rpc_rqst rl_slot;
struct rpcrdma_buffer *rl_buffer;
struct rpcrdma_rep *rl_reply;
struct xdr_stream rl_stream;
@@ -357,16 +358,10 @@ enum {
RPCRDMA_REQ_F_TX_RESOURCES,
};
-static inline void
-rpcrdma_set_xprtdata(struct rpc_rqst *rqst, struct rpcrdma_req *req)
-{
- rqst->rq_xprtdata = req;
-}
-
static inline struct rpcrdma_req *
rpcr_to_rdmar(const struct rpc_rqst *rqst)
{
- return rqst->rq_xprtdata;
+ return container_of(rqst, struct rpcrdma_req, rl_slot);
}
static inline void
--
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