au_rslack is significantly smaller than (au_cslack << 2). Using
that value results in smaller receive buffers. In some cases this
eliminates an extra segment in Reply chunks (RPC/RDMA).
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
---
net/sunrpc/clnt.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
index 99bfeb1..241e842 100644
--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c
@@ -1690,7 +1690,7 @@ void rpc_force_rebind(struct rpc_clnt *clnt)
static void
call_allocate(struct rpc_task *task)
{
- unsigned int slack = task->tk_rqstp->rq_cred->cr_auth->au_cslack;
+ const struct rpc_auth *auth = task->tk_rqstp->rq_cred->cr_auth;
struct rpc_rqst *req = task->tk_rqstp;
struct rpc_xprt *xprt = req->rq_xprt;
const struct rpc_procinfo *proc = task->tk_msg.rpc_proc;
@@ -1715,9 +1715,10 @@ void rpc_force_rebind(struct rpc_clnt *clnt)
* and reply headers, and convert both values
* to byte sizes.
*/
- req->rq_callsize = RPC_CALLHDRSIZE + (slack << 1) + proc->p_arglen;
+ req->rq_callsize = RPC_CALLHDRSIZE + (auth->au_cslack << 1) +
+ proc->p_arglen;
req->rq_callsize <<= 2;
- req->rq_rcvsize = RPC_REPHDRSIZE + slack + proc->p_replen;
+ req->rq_rcvsize = RPC_REPHDRSIZE + auth->au_rslack + proc->p_replen;
req->rq_rcvsize <<= 2;
status = xprt->ops->buf_alloc(task);
