forked from luck/tmp_suning_uos_patched
52d58aef5e
For the cases where a lot of interfaces are used in conjunction with a lot of LLC sockets bound to the same SAP, the iteration of the socket list becomes prohibitively expensive. Replacing the list with a a local address based hash significantly improves the bind and listener lookup operations as well as the datagram delivery. Connected sockets delivery is also improved, but this patch does not address the case where we have lots of sockets with the same local address connected to different remote addresses. In order to keep the socket sanity checks alive and fast a socket counter was added to the SAP structure. Signed-off-by: Octavian Purdila <opurdila@ixiacom.com> Signed-off-by: David S. Miller <davem@davemloft.net>
280 lines
6.7 KiB
C
280 lines
6.7 KiB
C
/*
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* proc_llc.c - proc interface for LLC
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*
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* Copyright (c) 2001 by Jay Schulist <jschlst@samba.org>
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* 2002-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
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*
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* This program can be redistributed or modified under the terms of the
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* GNU General Public License as published by the Free Software Foundation.
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* This program is distributed without any warranty or implied warranty
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* of merchantability or fitness for a particular purpose.
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*
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* See the GNU General Public License for more details.
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/proc_fs.h>
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#include <linux/errno.h>
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#include <linux/seq_file.h>
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#include <net/net_namespace.h>
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#include <net/sock.h>
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#include <net/llc.h>
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#include <net/llc_c_ac.h>
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#include <net/llc_c_ev.h>
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#include <net/llc_c_st.h>
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#include <net/llc_conn.h>
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static void llc_ui_format_mac(struct seq_file *seq, u8 *addr)
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{
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seq_printf(seq, "%pM", addr);
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}
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static struct sock *llc_get_sk_idx(loff_t pos)
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{
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struct list_head *sap_entry;
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struct llc_sap *sap;
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struct sock *sk = NULL;
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int i;
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list_for_each(sap_entry, &llc_sap_list) {
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sap = list_entry(sap_entry, struct llc_sap, node);
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spin_lock_bh(&sap->sk_lock);
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for (i = 0; i < LLC_SK_LADDR_HASH_ENTRIES; i++) {
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struct hlist_nulls_head *head = &sap->sk_laddr_hash[i];
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struct hlist_nulls_node *node;
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sk_nulls_for_each(sk, node, head) {
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if (!pos)
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goto found; /* keep the lock */
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--pos;
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}
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}
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spin_unlock_bh(&sap->sk_lock);
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}
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sk = NULL;
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found:
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return sk;
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}
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static void *llc_seq_start(struct seq_file *seq, loff_t *pos)
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{
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loff_t l = *pos;
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read_lock_bh(&llc_sap_list_lock);
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return l ? llc_get_sk_idx(--l) : SEQ_START_TOKEN;
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}
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static struct sock *laddr_hash_next(struct llc_sap *sap, int bucket)
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{
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struct hlist_nulls_node *node;
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struct sock *sk = NULL;
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while (++bucket < LLC_SK_LADDR_HASH_ENTRIES)
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sk_nulls_for_each(sk, node, &sap->sk_laddr_hash[bucket])
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goto out;
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out:
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return sk;
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}
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static void *llc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
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{
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struct sock* sk, *next;
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struct llc_sock *llc;
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struct llc_sap *sap;
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++*pos;
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if (v == SEQ_START_TOKEN) {
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sk = llc_get_sk_idx(0);
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goto out;
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}
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sk = v;
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next = sk_nulls_next(sk);
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if (next) {
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sk = next;
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goto out;
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}
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llc = llc_sk(sk);
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sap = llc->sap;
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sk = laddr_hash_next(sap, llc_sk_laddr_hashfn(sap, &llc->laddr));
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if (sk)
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goto out;
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spin_unlock_bh(&sap->sk_lock);
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list_for_each_entry_continue(sap, &llc_sap_list, node) {
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spin_lock_bh(&sap->sk_lock);
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sk = laddr_hash_next(sap, -1);
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if (sk)
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break; /* keep the lock */
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spin_unlock_bh(&sap->sk_lock);
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}
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out:
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return sk;
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}
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static void llc_seq_stop(struct seq_file *seq, void *v)
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{
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if (v && v != SEQ_START_TOKEN) {
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struct sock *sk = v;
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struct llc_sock *llc = llc_sk(sk);
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struct llc_sap *sap = llc->sap;
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spin_unlock_bh(&sap->sk_lock);
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}
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read_unlock_bh(&llc_sap_list_lock);
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}
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static int llc_seq_socket_show(struct seq_file *seq, void *v)
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{
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struct sock* sk;
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struct llc_sock *llc;
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if (v == SEQ_START_TOKEN) {
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seq_puts(seq, "SKt Mc local_mac_sap remote_mac_sap "
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" tx_queue rx_queue st uid link\n");
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goto out;
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}
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sk = v;
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llc = llc_sk(sk);
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/* FIXME: check if the address is multicast */
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seq_printf(seq, "%2X %2X ", sk->sk_type, 0);
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if (llc->dev)
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llc_ui_format_mac(seq, llc->dev->dev_addr);
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else {
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u8 addr[6] = {0,0,0,0,0,0};
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llc_ui_format_mac(seq, addr);
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}
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seq_printf(seq, "@%02X ", llc->sap->laddr.lsap);
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llc_ui_format_mac(seq, llc->daddr.mac);
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seq_printf(seq, "@%02X %8d %8d %2d %3d %4d\n", llc->daddr.lsap,
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sk_wmem_alloc_get(sk),
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sk_rmem_alloc_get(sk) - llc->copied_seq,
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sk->sk_state,
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sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : -1,
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llc->link);
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out:
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return 0;
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}
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static const char *const llc_conn_state_names[] = {
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[LLC_CONN_STATE_ADM] = "adm",
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[LLC_CONN_STATE_SETUP] = "setup",
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[LLC_CONN_STATE_NORMAL] = "normal",
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[LLC_CONN_STATE_BUSY] = "busy",
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[LLC_CONN_STATE_REJ] = "rej",
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[LLC_CONN_STATE_AWAIT] = "await",
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[LLC_CONN_STATE_AWAIT_BUSY] = "await_busy",
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[LLC_CONN_STATE_AWAIT_REJ] = "await_rej",
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[LLC_CONN_STATE_D_CONN] = "d_conn",
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[LLC_CONN_STATE_RESET] = "reset",
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[LLC_CONN_STATE_ERROR] = "error",
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[LLC_CONN_STATE_TEMP] = "temp",
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};
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static int llc_seq_core_show(struct seq_file *seq, void *v)
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{
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struct sock* sk;
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struct llc_sock *llc;
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if (v == SEQ_START_TOKEN) {
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seq_puts(seq, "Connection list:\n"
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"dsap state retr txw rxw pf ff sf df rs cs "
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"tack tpfc trs tbs blog busr\n");
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goto out;
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}
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sk = v;
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llc = llc_sk(sk);
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seq_printf(seq, " %02X %-10s %3d %3d %3d %2d %2d %2d %2d %2d %2d "
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"%4d %4d %3d %3d %4d %4d\n",
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llc->daddr.lsap, llc_conn_state_names[llc->state],
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llc->retry_count, llc->k, llc->rw, llc->p_flag, llc->f_flag,
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llc->s_flag, llc->data_flag, llc->remote_busy_flag,
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llc->cause_flag, timer_pending(&llc->ack_timer.timer),
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timer_pending(&llc->pf_cycle_timer.timer),
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timer_pending(&llc->rej_sent_timer.timer),
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timer_pending(&llc->busy_state_timer.timer),
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!!sk->sk_backlog.tail, !!sock_owned_by_user(sk));
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out:
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return 0;
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}
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static const struct seq_operations llc_seq_socket_ops = {
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.start = llc_seq_start,
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.next = llc_seq_next,
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.stop = llc_seq_stop,
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.show = llc_seq_socket_show,
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};
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static const struct seq_operations llc_seq_core_ops = {
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.start = llc_seq_start,
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.next = llc_seq_next,
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.stop = llc_seq_stop,
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.show = llc_seq_core_show,
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};
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static int llc_seq_socket_open(struct inode *inode, struct file *file)
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{
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return seq_open(file, &llc_seq_socket_ops);
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}
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static int llc_seq_core_open(struct inode *inode, struct file *file)
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{
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return seq_open(file, &llc_seq_core_ops);
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}
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static const struct file_operations llc_seq_socket_fops = {
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.owner = THIS_MODULE,
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.open = llc_seq_socket_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = seq_release,
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};
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static const struct file_operations llc_seq_core_fops = {
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.owner = THIS_MODULE,
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.open = llc_seq_core_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = seq_release,
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};
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static struct proc_dir_entry *llc_proc_dir;
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int __init llc_proc_init(void)
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{
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int rc = -ENOMEM;
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struct proc_dir_entry *p;
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llc_proc_dir = proc_mkdir("llc", init_net.proc_net);
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if (!llc_proc_dir)
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goto out;
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p = proc_create("socket", S_IRUGO, llc_proc_dir, &llc_seq_socket_fops);
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if (!p)
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goto out_socket;
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p = proc_create("core", S_IRUGO, llc_proc_dir, &llc_seq_core_fops);
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if (!p)
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goto out_core;
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rc = 0;
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out:
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return rc;
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out_core:
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remove_proc_entry("socket", llc_proc_dir);
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out_socket:
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remove_proc_entry("llc", init_net.proc_net);
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goto out;
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}
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void llc_proc_exit(void)
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{
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remove_proc_entry("socket", llc_proc_dir);
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remove_proc_entry("core", llc_proc_dir);
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remove_proc_entry("llc", init_net.proc_net);
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}
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