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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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a2e2725541
Meaning receive multiple messages, reducing the number of syscalls and net stack entry/exit operations. Next patches will introduce mechanisms where protocols that want to optimize this operation will provide an unlocked_recvmsg operation. This takes into account comments made by: . Paul Moore: sock_recvmsg is called only for the first datagram, sock_recvmsg_nosec is used for the rest. . Caitlin Bestler: recvmmsg now has a struct timespec timeout, that works in the same fashion as the ppoll one. If the underlying protocol returns a datagram with MSG_OOB set, this will make recvmmsg return right away with as many datagrams (+ the OOB one) it has received so far. . Rémi Denis-Courmont & Steven Whitehouse: If we receive N < vlen datagrams and then recvmsg returns an error, recvmmsg will return the successfully received datagrams, store the error and return it in the next call. This paves the way for a subsequent optimization, sk_prot->unlocked_recvmsg, where we will be able to acquire the lock only at batch start and end, not at every underlying recvmsg call. Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
58 lines
1.9 KiB
C
58 lines
1.9 KiB
C
#ifndef NET_COMPAT_H
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#define NET_COMPAT_H
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struct sock;
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#if defined(CONFIG_COMPAT)
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#include <linux/compat.h>
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struct compat_msghdr {
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compat_uptr_t msg_name; /* void * */
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compat_int_t msg_namelen;
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compat_uptr_t msg_iov; /* struct compat_iovec * */
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compat_size_t msg_iovlen;
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compat_uptr_t msg_control; /* void * */
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compat_size_t msg_controllen;
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compat_uint_t msg_flags;
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};
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struct compat_mmsghdr {
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struct compat_msghdr msg_hdr;
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compat_uint_t msg_len;
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};
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struct compat_cmsghdr {
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compat_size_t cmsg_len;
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compat_int_t cmsg_level;
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compat_int_t cmsg_type;
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};
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extern int compat_sock_get_timestamp(struct sock *, struct timeval __user *);
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extern int compat_sock_get_timestampns(struct sock *, struct timespec __user *);
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#else /* defined(CONFIG_COMPAT) */
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#define compat_msghdr msghdr /* to avoid compiler warnings */
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#endif /* defined(CONFIG_COMPAT) */
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extern int get_compat_msghdr(struct msghdr *, struct compat_msghdr __user *);
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extern int verify_compat_iovec(struct msghdr *, struct iovec *, struct sockaddr *, int);
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extern asmlinkage long compat_sys_sendmsg(int,struct compat_msghdr __user *,unsigned);
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extern asmlinkage long compat_sys_recvmsg(int,struct compat_msghdr __user *,unsigned);
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extern asmlinkage long compat_sys_recvmmsg(int, struct compat_mmsghdr __user *,
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unsigned, unsigned,
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struct timespec __user *);
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extern asmlinkage long compat_sys_getsockopt(int, int, int, char __user *, int __user *);
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extern int put_cmsg_compat(struct msghdr*, int, int, int, void *);
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extern int cmsghdr_from_user_compat_to_kern(struct msghdr *, struct sock *, unsigned char *, int);
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extern int compat_mc_setsockopt(struct sock *, int, int, char __user *, unsigned int,
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int (*)(struct sock *, int, int, char __user *, unsigned int));
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extern int compat_mc_getsockopt(struct sock *, int, int, char __user *,
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int __user *, int (*)(struct sock *, int, int, char __user *,
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int __user *));
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#endif /* NET_COMPAT_H */
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