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SUNRPC: Refactor TCP receive 

Move the TCP data receive loop out of xs_tcp_data_ready(). Doing so
will allow us to move the data receive out of the softirq context in
a set of followup patches.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Trond Myklebust 2015-10-05 11:19:20 -04:00
parent c6fa8e6de3
commit 66d7a56a62
1 changed files with 29 additions and 15 deletions
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44
net/sunrpc/xprtsock.c
View File

@ -1391,6 +1391,30 @@ static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, uns
return len - desc.count;
}
static void xs_tcp_data_receive(struct sock_xprt *transport)
{
struct rpc_xprt *xprt = &transport->xprt;
struct sock *sk;
read_descriptor_t rd_desc = {
.count = 2*1024*1024,
.arg.data = xprt,
};
unsigned long total = 0;
int read = 0;
sk = transport->inet;
/* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
for (;;) {
read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
if (read <= 0)
break;
total += read;
rd_desc.count = 65536;
}
trace_xs_tcp_data_ready(xprt, read, total);
}
/**
* xs_tcp_data_ready - "data ready" callback for TCP sockets
* @sk: socket with data to read
@ -1398,34 +1422,24 @@ static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, uns
*/
static void xs_tcp_data_ready(struct sock *sk)
{
struct sock_xprt *transport;
struct rpc_xprt *xprt;
read_descriptor_t rd_desc;
int read;
unsigned long total = 0;
dprintk("RPC: xs_tcp_data_ready...\n");
read_lock_bh(&sk->sk_callback_lock);
if (!(xprt = xprt_from_sock(sk))) {
read = 0;
if (!(xprt = xprt_from_sock(sk)))
goto out;
}
transport = container_of(xprt, struct sock_xprt, xprt);
/* Any data means we had a useful conversation, so
* the we don't need to delay the next reconnect
*/
if (xprt->reestablish_timeout)
xprt->reestablish_timeout = 0;
/* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
rd_desc.arg.data = xprt;
do {
rd_desc.count = 65536;
read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
if (read > 0)
total += read;
} while (read > 0);
xs_tcp_data_receive(transport);
out:
trace_xs_tcp_data_ready(xprt, read, total);
read_unlock_bh(&sk->sk_callback_lock);
}