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f4e1fb04c1
Compared to TCP, ioctl(SIOCINQ) for AF_UNIX SOCK_STREAM socket is more expensive, as unix_inq_len() requires iterating through the receive queue and accumulating skb->len. Let's cache the value for SOCK_STREAM to a new field during sendmsg() and recvmsg(). The field is protected by the receive queue lock. Note that ioctl(SIOCINQ) for SOCK_DGRAM returns the length of the first skb in the queue. SOCK_SEQPACKET still requires iterating through the queue because we do not touch functions shared with unix_dgram_ops. But, if really needed, we can support it by switching __skb_try_recv_datagram() to a custom version. Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com> Reviewed-by: Willem de Bruijn <willemb@google.com> Link: https://patch.msgid.link/20250702223606.1054680-5-kuniyu@google.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
63 lines
1.4 KiB
C
63 lines
1.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __LINUX_NET_AFUNIX_H
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#define __LINUX_NET_AFUNIX_H
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#include <linux/atomic.h>
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#include <linux/mutex.h>
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#include <linux/net.h>
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#include <linux/path.h>
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#include <linux/refcount.h>
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#include <linux/spinlock.h>
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#include <linux/wait.h>
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#include <net/sock.h>
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#include <uapi/linux/un.h>
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#if IS_ENABLED(CONFIG_UNIX)
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struct unix_sock *unix_get_socket(struct file *filp);
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#else
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static inline struct unix_sock *unix_get_socket(struct file *filp)
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{
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return NULL;
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}
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#endif
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struct unix_address {
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refcount_t refcnt;
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int len;
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struct sockaddr_un name[];
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};
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struct scm_stat {
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atomic_t nr_fds;
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unsigned long nr_unix_fds;
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};
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/* The AF_UNIX socket */
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struct unix_sock {
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/* WARNING: sk has to be the first member */
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struct sock sk;
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struct unix_address *addr;
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struct path path;
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struct mutex iolock, bindlock;
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struct sock *peer;
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struct sock *listener;
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struct unix_vertex *vertex;
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spinlock_t lock;
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struct socket_wq peer_wq;
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#define peer_wait peer_wq.wait
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wait_queue_entry_t peer_wake;
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struct scm_stat scm_stat;
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int inq_len;
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#if IS_ENABLED(CONFIG_AF_UNIX_OOB)
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struct sk_buff *oob_skb;
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#endif
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};
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#define unix_sk(ptr) container_of_const(ptr, struct unix_sock, sk)
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#define unix_peer(sk) (unix_sk(sk)->peer)
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#define unix_state_lock(s) spin_lock(&unix_sk(s)->lock)
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#define unix_state_unlock(s) spin_unlock(&unix_sk(s)->lock)
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#endif
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