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Optimization:

Browse Source 
- Cork the socket while there are queued replies
 
 Fixes:
 
 - DRC shutdown ordering
 - svc_rdma_accept() lockdep splat
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Merge tag 'nfsd-5.12-1' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux

Pull more nfsd updates from Chuck Lever:
 "Here are a few additional NFSD commits for the merge window:

 Optimization:
   - Cork the socket while there are queued replies

  Fixes:
   - DRC shutdown ordering
   - svc_rdma_accept() lockdep splat"

* tag 'nfsd-5.12-1' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux:
  SUNRPC: Further clean up svc_tcp_sendmsg()
  SUNRPC: Remove redundant socket flags from svc_tcp_sendmsg()
  SUNRPC: Use TCP_CORK to optimise send performance on the server
  svcrdma: Hold private mutex while invoking rdma_accept()
  nfsd: register pernet ops last, unregister first
This commit is contained in:
Linus Torvalds 2021-02-22 13:29:55 -08:00
commit 7c70f3a748
4 changed files with 29 additions and 28 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
fs/nfsd/nfsctl.c
View File

@ -1525,12 +1525,9 @@ static int __init init_nfsd(void)
int retval;
printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
retval = register_pernet_subsys(&nfsd_net_ops);
if (retval < 0)
return retval;
retval = register_cld_notifier();
if (retval)
goto out_unregister_pernet;
return retval;
retval = nfsd4_init_slabs();
if (retval)
goto out_unregister_notifier;
@ -1549,9 +1546,14 @@ static int __init init_nfsd(void)
goto out_free_lockd;
retval = register_filesystem(&nfsd_fs_type);
if (retval)
goto out_free_exports;
retval = register_pernet_subsys(&nfsd_net_ops);
if (retval < 0)
goto out_free_all;
return 0;
out_free_all:
unregister_pernet_subsys(&nfsd_net_ops);
out_free_exports:
remove_proc_entry("fs/nfs/exports", NULL);
remove_proc_entry("fs/nfs", NULL);
out_free_lockd:
@ -1565,13 +1567,12 @@ out_free_slabs:
nfsd4_free_slabs();
out_unregister_notifier:
unregister_cld_notifier();
out_unregister_pernet:
unregister_pernet_subsys(&nfsd_net_ops);
return retval;
}
static void __exit exit_nfsd(void)
{
unregister_pernet_subsys(&nfsd_net_ops);
nfsd_drc_slab_free();
remove_proc_entry("fs/nfs/exports", NULL);
remove_proc_entry("fs/nfs", NULL);
@ -1581,7 +1582,6 @@ static void __exit exit_nfsd(void)
nfsd4_exit_pnfs();
unregister_filesystem(&nfsd_fs_type);
unregister_cld_notifier();
unregister_pernet_subsys(&nfsd_net_ops);
}
MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");

2
include/linux/sunrpc/svcsock.h
View File

@ -35,6 +35,8 @@ struct svc_sock {
/* Total length of the data (not including fragment headers)
* received so far in the fragments making up this rpc: */
u32 sk_datalen;
/* Number of queued send requests */
atomic_t sk_sendqlen;
struct page * sk_pages[RPCSVC_MAXPAGES]; /* received data */
};

35
net/sunrpc/svcsock.c
View File

@ -1078,9 +1078,8 @@ static int svc_tcp_send_kvec(struct socket *sock, const struct kvec *vec,
* In addition, the logic assumes that * .bv_len is never larger
* than PAGE_SIZE.
*/
static int svc_tcp_sendmsg(struct socket *sock, struct msghdr *msg,
struct xdr_buf *xdr, rpc_fraghdr marker,
unsigned int *sentp)
static int svc_tcp_sendmsg(struct socket *sock, struct xdr_buf *xdr,
rpc_fraghdr marker, unsigned int *sentp)
{
const struct kvec *head = xdr->head;
const struct kvec *tail = xdr->tail;
@ -1088,21 +1087,22 @@ static int svc_tcp_sendmsg(struct socket *sock, struct msghdr *msg,
.iov_base = &marker,
.iov_len = sizeof(marker),
};
int flags, ret;
struct msghdr msg = {
.msg_flags = 0,
};
int ret;
*sentp = 0;
xdr_alloc_bvec(xdr, GFP_KERNEL);
msg->msg_flags = MSG_MORE;
ret = kernel_sendmsg(sock, msg, &rm, 1, rm.iov_len);
ret = kernel_sendmsg(sock, &msg, &rm, 1, rm.iov_len);
if (ret < 0)
return ret;
*sentp += ret;
if (ret != rm.iov_len)
return -EAGAIN;
flags = head->iov_len < xdr->len ? MSG_MORE | MSG_SENDPAGE_NOTLAST : 0;
ret = svc_tcp_send_kvec(sock, head, flags);
ret = svc_tcp_send_kvec(sock, head, 0);
if (ret < 0)
return ret;
*sentp += ret;
@ -1116,15 +1116,11 @@ static int svc_tcp_sendmsg(struct socket *sock, struct msghdr *msg,
bvec = xdr->bvec + (xdr->page_base >> PAGE_SHIFT);
offset = offset_in_page(xdr->page_base);
remaining = xdr->page_len;
flags = MSG_MORE | MSG_SENDPAGE_NOTLAST;
while (remaining > 0) {
if (remaining <= PAGE_SIZE && tail->iov_len == 0)
flags = 0;
len = min(remaining, bvec->bv_len - offset);
ret = kernel_sendpage(sock, bvec->bv_page,
bvec->bv_offset + offset,
len, flags);
len, 0);
if (ret < 0)
return ret;
*sentp += ret;
@ -1163,26 +1159,28 @@ static int svc_tcp_sendto(struct svc_rqst *rqstp)
struct xdr_buf *xdr = &rqstp->rq_res;
rpc_fraghdr marker = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT |
(u32)xdr->len);
struct msghdr msg = {
.msg_flags = 0,
};
unsigned int sent;
int err;
svc_tcp_release_rqst(rqstp);
atomic_inc(&svsk->sk_sendqlen);
mutex_lock(&xprt->xpt_mutex);
if (svc_xprt_is_dead(xprt))
goto out_notconn;
err = svc_tcp_sendmsg(svsk->sk_sock, &msg, xdr, marker, &sent);
tcp_sock_set_cork(svsk->sk_sk, true);
err = svc_tcp_sendmsg(svsk->sk_sock, xdr, marker, &sent);
xdr_free_bvec(xdr);
trace_svcsock_tcp_send(xprt, err < 0 ? err : sent);
if (err < 0 || sent != (xdr->len + sizeof(marker)))
goto out_close;
if (atomic_dec_and_test(&svsk->sk_sendqlen))
tcp_sock_set_cork(svsk->sk_sk, false);
mutex_unlock(&xprt->xpt_mutex);
return sent;
out_notconn:
atomic_dec(&svsk->sk_sendqlen);
mutex_unlock(&xprt->xpt_mutex);
return -ENOTCONN;
out_close:
@ -1192,6 +1190,7 @@ out_close:
(err < 0) ? err : sent, xdr->len);
set_bit(XPT_CLOSE, &xprt->xpt_flags);
svc_xprt_enqueue(xprt);
atomic_dec(&svsk->sk_sendqlen);
mutex_unlock(&xprt->xpt_mutex);
return -EAGAIN;
}
@ -1261,7 +1260,7 @@ static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv)
svsk->sk_datalen = 0;
memset(&svsk->sk_pages[0], 0, sizeof(svsk->sk_pages));
tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
tcp_sock_set_nodelay(sk);
set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
switch (sk->sk_state) {

6
net/sunrpc/xprtrdma/svc_rdma_transport.c
View File

@ -475,9 +475,6 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt)
if (!svc_rdma_post_recvs(newxprt))
goto errout;
/* Swap out the handler */
newxprt->sc_cm_id->event_handler = svc_rdma_cma_handler;
/* Construct RDMA-CM private message */
pmsg.cp_magic = rpcrdma_cmp_magic;
pmsg.cp_version = RPCRDMA_CMP_VERSION;
@ -498,7 +495,10 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt)
}
conn_param.private_data = &pmsg;
conn_param.private_data_len = sizeof(pmsg);
rdma_lock_handler(newxprt->sc_cm_id);
newxprt->sc_cm_id->event_handler = svc_rdma_cma_handler;
ret = rdma_accept(newxprt->sc_cm_id, &conn_param);
rdma_unlock_handler(newxprt->sc_cm_id);
if (ret) {
trace_svcrdma_accept_err(newxprt, ret);
goto errout;