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SUNRPC: Optimize svc_process()

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Move exception handling code out of the hot path, and avoid the need
for a bswap of a non-constant.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever 2022-09-12 17:22:33 -04:00
parent 7746b32f46
commit 81593c4dff
1 changed files with 11 additions and 13 deletions
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24
net/sunrpc/svc.c
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@ -1434,8 +1434,7 @@ svc_process(struct svc_rqst *rqstp)
{
struct kvec *argv = &rqstp->rq_arg.head[0];
struct kvec *resv = &rqstp->rq_res.head[0];
struct svc_serv *serv = rqstp->rq_server;
u32 dir;
__be32 dir;
#if IS_ENABLED(CONFIG_FAIL_SUNRPC)
if (!fail_sunrpc.ignore_server_disconnect &&
@ -1450,7 +1449,7 @@ svc_process(struct svc_rqst *rqstp)
rqstp->rq_next_page = &rqstp->rq_respages[1];
resv->iov_base = page_address(rqstp->rq_respages[0]);
resv->iov_len = 0;
rqstp->rq_res.pages = rqstp->rq_respages + 1;
rqstp->rq_res.pages = rqstp->rq_next_page;
rqstp->rq_res.len = 0;
rqstp->rq_res.page_base = 0;
rqstp->rq_res.page_len = 0;
@ -1458,18 +1457,17 @@ svc_process(struct svc_rqst *rqstp)
rqstp->rq_res.tail[0].iov_base = NULL;
rqstp->rq_res.tail[0].iov_len = 0;
dir = svc_getnl(argv);
if (dir != 0) {
/* direction != CALL */
svc_printk(rqstp, "bad direction %d, dropping request\n", dir);
serv->sv_stats->rpcbadfmt++;
dir = svc_getu32(argv);
if (dir != rpc_call)
goto out_baddir;
if (!svc_process_common(rqstp, argv, resv))
goto out_drop;
}
/* Returns 1 for send, 0 for drop */
if (likely(svc_process_common(rqstp, argv, resv)))
return svc_send(rqstp);
return svc_send(rqstp);
out_baddir:
svc_printk(rqstp, "bad direction 0x%08x, dropping request\n",
be32_to_cpu(dir));
rqstp->rq_server->sv_stats->rpcbadfmt++;
out_drop:
svc_drop(rqstp);
return 0;