d4546c2509
Manage pending per-NAPI GRO packets via list_head. Return an SKB pointer from the GRO receive handlers. When GRO receive handlers return non-NULL, it means that this SKB needs to be completed at this time and removed from the NAPI queue. Several operations are greatly simplified by this transformation, especially timing out the oldest SKB in the list when gro_count exceeds MAX_GRO_SKBS, and napi_gro_flush() which walks the queue in reverse order. Signed-off-by: David S. Miller <davem@davemloft.net>
126 lines
3.7 KiB
C
126 lines
3.7 KiB
C
/*
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* INET An implementation of the TCP/IP protocol suite for the LINUX
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* operating system. INET is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* Definitions for the UDP protocol.
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*
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* Version: @(#)udp.h 1.0.2 04/28/93
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*
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* Author: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef _LINUX_UDP_H
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#define _LINUX_UDP_H
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#include <net/inet_sock.h>
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#include <linux/skbuff.h>
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#include <net/netns/hash.h>
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#include <uapi/linux/udp.h>
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static inline struct udphdr *udp_hdr(const struct sk_buff *skb)
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{
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return (struct udphdr *)skb_transport_header(skb);
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}
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static inline struct udphdr *inner_udp_hdr(const struct sk_buff *skb)
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{
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return (struct udphdr *)skb_inner_transport_header(skb);
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}
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#define UDP_HTABLE_SIZE_MIN (CONFIG_BASE_SMALL ? 128 : 256)
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static inline u32 udp_hashfn(const struct net *net, u32 num, u32 mask)
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{
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return (num + net_hash_mix(net)) & mask;
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}
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struct udp_sock {
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/* inet_sock has to be the first member */
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struct inet_sock inet;
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#define udp_port_hash inet.sk.__sk_common.skc_u16hashes[0]
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#define udp_portaddr_hash inet.sk.__sk_common.skc_u16hashes[1]
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#define udp_portaddr_node inet.sk.__sk_common.skc_portaddr_node
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int pending; /* Any pending frames ? */
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unsigned int corkflag; /* Cork is required */
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__u8 encap_type; /* Is this an Encapsulation socket? */
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unsigned char no_check6_tx:1,/* Send zero UDP6 checksums on TX? */
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no_check6_rx:1;/* Allow zero UDP6 checksums on RX? */
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/*
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* Following member retains the information to create a UDP header
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* when the socket is uncorked.
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*/
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__u16 len; /* total length of pending frames */
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__u16 gso_size;
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/*
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* Fields specific to UDP-Lite.
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*/
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__u16 pcslen;
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__u16 pcrlen;
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/* indicator bits used by pcflag: */
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#define UDPLITE_BIT 0x1 /* set by udplite proto init function */
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#define UDPLITE_SEND_CC 0x2 /* set via udplite setsockopt */
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#define UDPLITE_RECV_CC 0x4 /* set via udplite setsocktopt */
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__u8 pcflag; /* marks socket as UDP-Lite if > 0 */
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__u8 unused[3];
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/*
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* For encapsulation sockets.
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*/
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int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
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void (*encap_destroy)(struct sock *sk);
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/* GRO functions for UDP socket */
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struct sk_buff * (*gro_receive)(struct sock *sk,
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struct list_head *head,
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struct sk_buff *skb);
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int (*gro_complete)(struct sock *sk,
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struct sk_buff *skb,
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int nhoff);
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/* udp_recvmsg try to use this before splicing sk_receive_queue */
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struct sk_buff_head reader_queue ____cacheline_aligned_in_smp;
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/* This field is dirtied by udp_recvmsg() */
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int forward_deficit;
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};
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#define UDP_MAX_SEGMENTS (1 << 6UL)
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static inline struct udp_sock *udp_sk(const struct sock *sk)
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{
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return (struct udp_sock *)sk;
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}
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static inline void udp_set_no_check6_tx(struct sock *sk, bool val)
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{
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udp_sk(sk)->no_check6_tx = val;
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}
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static inline void udp_set_no_check6_rx(struct sock *sk, bool val)
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{
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udp_sk(sk)->no_check6_rx = val;
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}
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static inline bool udp_get_no_check6_tx(struct sock *sk)
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{
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return udp_sk(sk)->no_check6_tx;
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}
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static inline bool udp_get_no_check6_rx(struct sock *sk)
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{
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return udp_sk(sk)->no_check6_rx;
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}
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#define udp_portaddr_for_each_entry(__sk, list) \
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hlist_for_each_entry(__sk, list, __sk_common.skc_portaddr_node)
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#define udp_portaddr_for_each_entry_rcu(__sk, list) \
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hlist_for_each_entry_rcu(__sk, list, __sk_common.skc_portaddr_node)
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#define IS_UDPLITE(__sk) (__sk->sk_protocol == IPPROTO_UDPLITE)
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#endif /* _LINUX_UDP_H */
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