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SUNRPC: Add a separate spinlock to protect the RPC request receive list

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This further reduces contention with the transport_lock, and allows us
to convert to using a non-bh-safe spinlock, since the list is now never
accessed from a bh context.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Trond Myklebust
2017-08-16 15:30:35 -04:00
parent 040249dfbe
commit ce7c252a8c
6 changed files with 41 additions and 31 deletions
Download Patch File Download Diff File Expand all files Collapse all files

30
net/sunrpc/xprtsock.c
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@@ -969,12 +969,12 @@ static void xs_local_data_read_skb(struct rpc_xprt *xprt,
return;
/* Look up and lock the request corresponding to the given XID */
spin_lock_bh(&xprt->transport_lock);
spin_lock(&xprt->recv_lock);
rovr = xprt_lookup_rqst(xprt, *xp);
if (!rovr)
goto out_unlock;
xprt_pin_rqst(rovr);
spin_unlock_bh(&xprt->transport_lock);
spin_unlock(&xprt->recv_lock);
task = rovr->rq_task;
copied = rovr->rq_private_buf.buflen;
@@ -983,16 +983,16 @@ static void xs_local_data_read_skb(struct rpc_xprt *xprt,
if (xs_local_copy_to_xdr(&rovr->rq_private_buf, skb)) {
dprintk("RPC: sk_buff copy failed\n");
spin_lock_bh(&xprt->transport_lock);
spin_lock(&xprt->recv_lock);
goto out_unpin;
}
spin_lock_bh(&xprt->transport_lock);
spin_lock(&xprt->recv_lock);
xprt_complete_rqst(task, copied);
out_unpin:
xprt_unpin_rqst(rovr);
out_unlock:
spin_unlock_bh(&xprt->transport_lock);
spin_unlock(&xprt->recv_lock);
}
static void xs_local_data_receive(struct sock_xprt *transport)
@@ -1055,12 +1055,12 @@ static void xs_udp_data_read_skb(struct rpc_xprt *xprt,
return;
/* Look up and lock the request corresponding to the given XID */
spin_lock_bh(&xprt->transport_lock);
spin_lock(&xprt->recv_lock);
rovr = xprt_lookup_rqst(xprt, *xp);
if (!rovr)
goto out_unlock;
xprt_pin_rqst(rovr);
spin_unlock_bh(&xprt->transport_lock);
spin_unlock(&xprt->recv_lock);
task = rovr->rq_task;
if ((copied = rovr->rq_private_buf.buflen) > repsize)
@@ -1069,7 +1069,7 @@ static void xs_udp_data_read_skb(struct rpc_xprt *xprt,
/* Suck it into the iovec, verify checksum if not done by hw. */
if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
__UDPX_INC_STATS(sk, UDP_MIB_INERRORS);
spin_lock_bh(&xprt->transport_lock);
spin_lock(&xprt->recv_lock);
goto out_unpin;
}
@@ -1077,11 +1077,13 @@ static void xs_udp_data_read_skb(struct rpc_xprt *xprt,
spin_lock_bh(&xprt->transport_lock);
xprt_adjust_cwnd(xprt, task, copied);
spin_unlock_bh(&xprt->transport_lock);
spin_lock(&xprt->recv_lock);
xprt_complete_rqst(task, copied);
out_unpin:
xprt_unpin_rqst(rovr);
out_unlock:
spin_unlock_bh(&xprt->transport_lock);
spin_unlock(&xprt->recv_lock);
}
static void xs_udp_data_receive(struct sock_xprt *transport)
@@ -1344,24 +1346,24 @@ static inline int xs_tcp_read_reply(struct rpc_xprt *xprt,
dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid));
/* Find and lock the request corresponding to this xid */
spin_lock_bh(&xprt->transport_lock);
spin_lock(&xprt->recv_lock);
req = xprt_lookup_rqst(xprt, transport->tcp_xid);
if (!req) {
dprintk("RPC: XID %08x request not found!\n",
ntohl(transport->tcp_xid));
spin_unlock_bh(&xprt->transport_lock);
spin_unlock(&xprt->recv_lock);
return -1;
}
xprt_pin_rqst(req);
spin_unlock_bh(&xprt->transport_lock);
spin_unlock(&xprt->recv_lock);
xs_tcp_read_common(xprt, desc, req);
spin_lock_bh(&xprt->transport_lock);
spin_lock(&xprt->recv_lock);
if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
xprt_complete_rqst(req->rq_task, transport->tcp_copied);
xprt_unpin_rqst(req);
spin_unlock_bh(&xprt->transport_lock);
spin_unlock(&xprt->recv_lock);
return 0;
}