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![Thomas Gleixner](/assets/img/avatar_default.png)
Based on 2 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation # extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 4122 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Enrico Weigelt <info@metux.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
198 lines
4.8 KiB
C
198 lines
4.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Kernel Connection Multiplexor
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*
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* Copyright (c) 2016 Tom Herbert <tom@herbertland.com>
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*/
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#ifndef __NET_KCM_H_
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#define __NET_KCM_H_
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#include <linux/skbuff.h>
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#include <net/sock.h>
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#include <net/strparser.h>
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#include <uapi/linux/kcm.h>
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extern unsigned int kcm_net_id;
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#define KCM_STATS_ADD(stat, count) ((stat) += (count))
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#define KCM_STATS_INCR(stat) ((stat)++)
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struct kcm_psock_stats {
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unsigned long long tx_msgs;
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unsigned long long tx_bytes;
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unsigned long long reserved;
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unsigned long long unreserved;
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unsigned int tx_aborts;
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};
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struct kcm_mux_stats {
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unsigned long long rx_msgs;
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unsigned long long rx_bytes;
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unsigned long long tx_msgs;
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unsigned long long tx_bytes;
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unsigned int rx_ready_drops;
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unsigned int tx_retries;
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unsigned int psock_attach;
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unsigned int psock_unattach_rsvd;
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unsigned int psock_unattach;
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};
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struct kcm_stats {
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unsigned long long rx_msgs;
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unsigned long long rx_bytes;
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unsigned long long tx_msgs;
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unsigned long long tx_bytes;
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};
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struct kcm_tx_msg {
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unsigned int sent;
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unsigned int fragidx;
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unsigned int frag_offset;
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unsigned int msg_flags;
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struct sk_buff *frag_skb;
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struct sk_buff *last_skb;
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};
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/* Socket structure for KCM client sockets */
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struct kcm_sock {
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struct sock sk;
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struct kcm_mux *mux;
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struct list_head kcm_sock_list;
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int index;
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u32 done : 1;
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struct work_struct done_work;
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struct kcm_stats stats;
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/* Transmit */
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struct kcm_psock *tx_psock;
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struct work_struct tx_work;
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struct list_head wait_psock_list;
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struct sk_buff *seq_skb;
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u32 tx_stopped : 1;
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/* Don't use bit fields here, these are set under different locks */
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bool tx_wait;
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bool tx_wait_more;
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/* Receive */
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struct kcm_psock *rx_psock;
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struct list_head wait_rx_list; /* KCMs waiting for receiving */
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bool rx_wait;
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u32 rx_disabled : 1;
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};
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struct bpf_prog;
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/* Structure for an attached lower socket */
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struct kcm_psock {
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struct sock *sk;
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struct strparser strp;
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struct kcm_mux *mux;
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int index;
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u32 tx_stopped : 1;
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u32 done : 1;
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u32 unattaching : 1;
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void (*save_state_change)(struct sock *sk);
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void (*save_data_ready)(struct sock *sk);
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void (*save_write_space)(struct sock *sk);
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struct list_head psock_list;
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struct kcm_psock_stats stats;
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/* Receive */
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struct list_head psock_ready_list;
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struct bpf_prog *bpf_prog;
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struct kcm_sock *rx_kcm;
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unsigned long long saved_rx_bytes;
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unsigned long long saved_rx_msgs;
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struct sk_buff *ready_rx_msg;
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/* Transmit */
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struct kcm_sock *tx_kcm;
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struct list_head psock_avail_list;
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unsigned long long saved_tx_bytes;
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unsigned long long saved_tx_msgs;
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};
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/* Per net MUX list */
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struct kcm_net {
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struct mutex mutex;
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struct kcm_psock_stats aggregate_psock_stats;
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struct kcm_mux_stats aggregate_mux_stats;
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struct strp_aggr_stats aggregate_strp_stats;
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struct list_head mux_list;
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int count;
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};
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/* Structure for a MUX */
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struct kcm_mux {
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struct list_head kcm_mux_list;
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struct rcu_head rcu;
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struct kcm_net *knet;
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struct list_head kcm_socks; /* All KCM sockets on MUX */
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int kcm_socks_cnt; /* Total KCM socket count for MUX */
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struct list_head psocks; /* List of all psocks on MUX */
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int psocks_cnt; /* Total attached sockets */
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struct kcm_mux_stats stats;
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struct kcm_psock_stats aggregate_psock_stats;
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struct strp_aggr_stats aggregate_strp_stats;
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/* Receive */
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spinlock_t rx_lock ____cacheline_aligned_in_smp;
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struct list_head kcm_rx_waiters; /* KCMs waiting for receiving */
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struct list_head psocks_ready; /* List of psocks with a msg ready */
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struct sk_buff_head rx_hold_queue;
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/* Transmit */
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spinlock_t lock ____cacheline_aligned_in_smp; /* TX and mux locking */
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struct list_head psocks_avail; /* List of available psocks */
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struct list_head kcm_tx_waiters; /* KCMs waiting for a TX psock */
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};
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#ifdef CONFIG_PROC_FS
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int kcm_proc_init(void);
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void kcm_proc_exit(void);
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#else
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static inline int kcm_proc_init(void) { return 0; }
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static inline void kcm_proc_exit(void) { }
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#endif
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static inline void aggregate_psock_stats(struct kcm_psock_stats *stats,
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struct kcm_psock_stats *agg_stats)
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{
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/* Save psock statistics in the mux when psock is being unattached. */
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#define SAVE_PSOCK_STATS(_stat) (agg_stats->_stat += stats->_stat)
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SAVE_PSOCK_STATS(tx_msgs);
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SAVE_PSOCK_STATS(tx_bytes);
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SAVE_PSOCK_STATS(reserved);
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SAVE_PSOCK_STATS(unreserved);
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SAVE_PSOCK_STATS(tx_aborts);
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#undef SAVE_PSOCK_STATS
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}
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static inline void aggregate_mux_stats(struct kcm_mux_stats *stats,
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struct kcm_mux_stats *agg_stats)
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{
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/* Save psock statistics in the mux when psock is being unattached. */
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#define SAVE_MUX_STATS(_stat) (agg_stats->_stat += stats->_stat)
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SAVE_MUX_STATS(rx_msgs);
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SAVE_MUX_STATS(rx_bytes);
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SAVE_MUX_STATS(tx_msgs);
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SAVE_MUX_STATS(tx_bytes);
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SAVE_MUX_STATS(rx_ready_drops);
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SAVE_MUX_STATS(psock_attach);
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SAVE_MUX_STATS(psock_unattach_rsvd);
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SAVE_MUX_STATS(psock_unattach);
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#undef SAVE_MUX_STATS
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}
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#endif /* __NET_KCM_H_ */
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