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SUNRPC: Chunk reading of replies from the server

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Read the TCP data in chunks of max 2MB so that we do not hog the
socket lock.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Trond Myklebust 2018-01-14 15:47:06 -05:00
parent 024fbf9c2e
commit 3d188805f8
1 changed files with 11 additions and 4 deletions
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15
net/sunrpc/xprtsock.c
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@ -52,6 +52,8 @@
#include "sunrpc.h"
#define RPC_TCP_READ_CHUNK_SZ (3*512*1024)
static void xs_close(struct rpc_xprt *xprt);
static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt,
struct socket *sock);
@ -1479,6 +1481,7 @@ static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, uns
.offset = offset,
.count = len,
};
size_t ret;
dprintk("RPC: xs_tcp_data_recv started\n");
do {
@ -1507,9 +1510,14 @@ static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, uns
/* Skip over any trailing bytes on short reads */
xs_tcp_read_discard(transport, &desc);
} while (desc.count);
ret = len - desc.count;
if (ret < rd_desc->count)
rd_desc->count -= ret;
else
rd_desc->count = 0;
trace_xs_tcp_data_recv(transport);
dprintk("RPC: xs_tcp_data_recv done\n");
return len - desc.count;
return ret;
}
static void xs_tcp_data_receive(struct sock_xprt *transport)
@ -1517,7 +1525,6 @@ 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;
@ -1531,16 +1538,16 @@ static void xs_tcp_data_receive(struct sock_xprt *transport)
/* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
for (loop = 0; loop < 64; loop++) {
rd_desc.count = RPC_TCP_READ_CHUNK_SZ;
lock_sock(sk);
read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
if (read <= 0) {
if (rd_desc.count != 0 || read < 0) {
clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state);
release_sock(sk);
break;
}
release_sock(sk);
total += read;
rd_desc.count = 65536;
}
if (test_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
queue_work(xprtiod_workqueue, &transport->recv_worker);