mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 16:56:40 +07:00
a83045292d
After the earlier commits ("tipc: remove 'links' list from tipc_bearer struct") and ("tipc: introduce new spinlock to protect struct link_req"), there is no longer any need to protect struct link_req or or any link list by use of bearer_lock. Furthermore, we have eliminated the need for using bearer_lock during downcalls (send) from the link to the bearer, since we have ensured that bearers always have a longer life cycle that their associated links, and always contain valid data. So, the only need now for a lock protecting bearers is for guaranteeing consistency of the bearer list itself. For this, it is sufficient, at least for the time being, to continue applying 'net_lock´ in write mode. By removing bearer_lock we also pre-empt introduction of issue b) descibed in the previous commit "tipc: remove 'links' list from tipc_bearer struct": "b) When the outer protection from net_lock is gone, taking bearer_lock and node_lock in opposite order of method 1) and 2) will become an obvious deadlock hazard". Therefore, we now eliminate the bearer_lock spinlock. Signed-off-by: Ying Xue <ying.xue@windriver.com> Reviewed-by: Paul Gortmaker <paul.gortmaker@windriver.com> Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
908 lines
23 KiB
C
908 lines
23 KiB
C
/*
|
|
* net/tipc/bcast.c: TIPC broadcast code
|
|
*
|
|
* Copyright (c) 2004-2006, Ericsson AB
|
|
* Copyright (c) 2004, Intel Corporation.
|
|
* Copyright (c) 2005, 2010-2011, Wind River Systems
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the names of the copyright holders nor the names of its
|
|
* contributors may be used to endorse or promote products derived from
|
|
* this software without specific prior written permission.
|
|
*
|
|
* Alternatively, this software may be distributed under the terms of the
|
|
* GNU General Public License ("GPL") version 2 as published by the Free
|
|
* Software Foundation.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
|
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include "core.h"
|
|
#include "link.h"
|
|
#include "port.h"
|
|
#include "bcast.h"
|
|
#include "name_distr.h"
|
|
|
|
#define MAX_PKT_DEFAULT_MCAST 1500 /* bcast link max packet size (fixed) */
|
|
|
|
#define BCLINK_WIN_DEFAULT 20 /* bcast link window size (default) */
|
|
|
|
/**
|
|
* struct tipc_bcbearer_pair - a pair of bearers used by broadcast link
|
|
* @primary: pointer to primary bearer
|
|
* @secondary: pointer to secondary bearer
|
|
*
|
|
* Bearers must have same priority and same set of reachable destinations
|
|
* to be paired.
|
|
*/
|
|
|
|
struct tipc_bcbearer_pair {
|
|
struct tipc_bearer *primary;
|
|
struct tipc_bearer *secondary;
|
|
};
|
|
|
|
/**
|
|
* struct tipc_bcbearer - bearer used by broadcast link
|
|
* @bearer: (non-standard) broadcast bearer structure
|
|
* @media: (non-standard) broadcast media structure
|
|
* @bpairs: array of bearer pairs
|
|
* @bpairs_temp: temporary array of bearer pairs used by tipc_bcbearer_sort()
|
|
* @remains: temporary node map used by tipc_bcbearer_send()
|
|
* @remains_new: temporary node map used tipc_bcbearer_send()
|
|
*
|
|
* Note: The fields labelled "temporary" are incorporated into the bearer
|
|
* to avoid consuming potentially limited stack space through the use of
|
|
* large local variables within multicast routines. Concurrent access is
|
|
* prevented through use of the spinlock "bc_lock".
|
|
*/
|
|
struct tipc_bcbearer {
|
|
struct tipc_bearer bearer;
|
|
struct tipc_media media;
|
|
struct tipc_bcbearer_pair bpairs[MAX_BEARERS];
|
|
struct tipc_bcbearer_pair bpairs_temp[TIPC_MAX_LINK_PRI + 1];
|
|
struct tipc_node_map remains;
|
|
struct tipc_node_map remains_new;
|
|
};
|
|
|
|
/**
|
|
* struct tipc_bclink - link used for broadcast messages
|
|
* @link: (non-standard) broadcast link structure
|
|
* @node: (non-standard) node structure representing b'cast link's peer node
|
|
* @bcast_nodes: map of broadcast-capable nodes
|
|
* @retransmit_to: node that most recently requested a retransmit
|
|
*
|
|
* Handles sequence numbering, fragmentation, bundling, etc.
|
|
*/
|
|
struct tipc_bclink {
|
|
struct tipc_link link;
|
|
struct tipc_node node;
|
|
struct tipc_node_map bcast_nodes;
|
|
struct tipc_node *retransmit_to;
|
|
};
|
|
|
|
static struct tipc_bcbearer bcast_bearer;
|
|
static struct tipc_bclink bcast_link;
|
|
|
|
static struct tipc_bcbearer *bcbearer = &bcast_bearer;
|
|
static struct tipc_bclink *bclink = &bcast_link;
|
|
static struct tipc_link *bcl = &bcast_link.link;
|
|
|
|
static DEFINE_SPINLOCK(bc_lock);
|
|
|
|
const char tipc_bclink_name[] = "broadcast-link";
|
|
|
|
static void tipc_nmap_diff(struct tipc_node_map *nm_a,
|
|
struct tipc_node_map *nm_b,
|
|
struct tipc_node_map *nm_diff);
|
|
|
|
static u32 bcbuf_acks(struct sk_buff *buf)
|
|
{
|
|
return (u32)(unsigned long)TIPC_SKB_CB(buf)->handle;
|
|
}
|
|
|
|
static void bcbuf_set_acks(struct sk_buff *buf, u32 acks)
|
|
{
|
|
TIPC_SKB_CB(buf)->handle = (void *)(unsigned long)acks;
|
|
}
|
|
|
|
static void bcbuf_decr_acks(struct sk_buff *buf)
|
|
{
|
|
bcbuf_set_acks(buf, bcbuf_acks(buf) - 1);
|
|
}
|
|
|
|
void tipc_bclink_add_node(u32 addr)
|
|
{
|
|
spin_lock_bh(&bc_lock);
|
|
tipc_nmap_add(&bclink->bcast_nodes, addr);
|
|
spin_unlock_bh(&bc_lock);
|
|
}
|
|
|
|
void tipc_bclink_remove_node(u32 addr)
|
|
{
|
|
spin_lock_bh(&bc_lock);
|
|
tipc_nmap_remove(&bclink->bcast_nodes, addr);
|
|
spin_unlock_bh(&bc_lock);
|
|
}
|
|
|
|
static void bclink_set_last_sent(void)
|
|
{
|
|
if (bcl->next_out)
|
|
bcl->fsm_msg_cnt = mod(buf_seqno(bcl->next_out) - 1);
|
|
else
|
|
bcl->fsm_msg_cnt = mod(bcl->next_out_no - 1);
|
|
}
|
|
|
|
u32 tipc_bclink_get_last_sent(void)
|
|
{
|
|
return bcl->fsm_msg_cnt;
|
|
}
|
|
|
|
static void bclink_update_last_sent(struct tipc_node *node, u32 seqno)
|
|
{
|
|
node->bclink.last_sent = less_eq(node->bclink.last_sent, seqno) ?
|
|
seqno : node->bclink.last_sent;
|
|
}
|
|
|
|
|
|
/**
|
|
* tipc_bclink_retransmit_to - get most recent node to request retransmission
|
|
*
|
|
* Called with bc_lock locked
|
|
*/
|
|
struct tipc_node *tipc_bclink_retransmit_to(void)
|
|
{
|
|
return bclink->retransmit_to;
|
|
}
|
|
|
|
/**
|
|
* bclink_retransmit_pkt - retransmit broadcast packets
|
|
* @after: sequence number of last packet to *not* retransmit
|
|
* @to: sequence number of last packet to retransmit
|
|
*
|
|
* Called with bc_lock locked
|
|
*/
|
|
static void bclink_retransmit_pkt(u32 after, u32 to)
|
|
{
|
|
struct sk_buff *buf;
|
|
|
|
buf = bcl->first_out;
|
|
while (buf && less_eq(buf_seqno(buf), after))
|
|
buf = buf->next;
|
|
tipc_link_retransmit(bcl, buf, mod(to - after));
|
|
}
|
|
|
|
/**
|
|
* tipc_bclink_acknowledge - handle acknowledgement of broadcast packets
|
|
* @n_ptr: node that sent acknowledgement info
|
|
* @acked: broadcast sequence # that has been acknowledged
|
|
*
|
|
* Node is locked, bc_lock unlocked.
|
|
*/
|
|
void tipc_bclink_acknowledge(struct tipc_node *n_ptr, u32 acked)
|
|
{
|
|
struct sk_buff *crs;
|
|
struct sk_buff *next;
|
|
unsigned int released = 0;
|
|
|
|
spin_lock_bh(&bc_lock);
|
|
|
|
/* Bail out if tx queue is empty (no clean up is required) */
|
|
crs = bcl->first_out;
|
|
if (!crs)
|
|
goto exit;
|
|
|
|
/* Determine which messages need to be acknowledged */
|
|
if (acked == INVALID_LINK_SEQ) {
|
|
/*
|
|
* Contact with specified node has been lost, so need to
|
|
* acknowledge sent messages only (if other nodes still exist)
|
|
* or both sent and unsent messages (otherwise)
|
|
*/
|
|
if (bclink->bcast_nodes.count)
|
|
acked = bcl->fsm_msg_cnt;
|
|
else
|
|
acked = bcl->next_out_no;
|
|
} else {
|
|
/*
|
|
* Bail out if specified sequence number does not correspond
|
|
* to a message that has been sent and not yet acknowledged
|
|
*/
|
|
if (less(acked, buf_seqno(crs)) ||
|
|
less(bcl->fsm_msg_cnt, acked) ||
|
|
less_eq(acked, n_ptr->bclink.acked))
|
|
goto exit;
|
|
}
|
|
|
|
/* Skip over packets that node has previously acknowledged */
|
|
while (crs && less_eq(buf_seqno(crs), n_ptr->bclink.acked))
|
|
crs = crs->next;
|
|
|
|
/* Update packets that node is now acknowledging */
|
|
|
|
while (crs && less_eq(buf_seqno(crs), acked)) {
|
|
next = crs->next;
|
|
|
|
if (crs != bcl->next_out)
|
|
bcbuf_decr_acks(crs);
|
|
else {
|
|
bcbuf_set_acks(crs, 0);
|
|
bcl->next_out = next;
|
|
bclink_set_last_sent();
|
|
}
|
|
|
|
if (bcbuf_acks(crs) == 0) {
|
|
bcl->first_out = next;
|
|
bcl->out_queue_size--;
|
|
kfree_skb(crs);
|
|
released = 1;
|
|
}
|
|
crs = next;
|
|
}
|
|
n_ptr->bclink.acked = acked;
|
|
|
|
/* Try resolving broadcast link congestion, if necessary */
|
|
|
|
if (unlikely(bcl->next_out)) {
|
|
tipc_link_push_queue(bcl);
|
|
bclink_set_last_sent();
|
|
}
|
|
if (unlikely(released && !list_empty(&bcl->waiting_ports)))
|
|
tipc_link_wakeup_ports(bcl, 0);
|
|
exit:
|
|
spin_unlock_bh(&bc_lock);
|
|
}
|
|
|
|
/**
|
|
* tipc_bclink_update_link_state - update broadcast link state
|
|
*
|
|
* tipc_net_lock and node lock set
|
|
*/
|
|
void tipc_bclink_update_link_state(struct tipc_node *n_ptr, u32 last_sent)
|
|
{
|
|
struct sk_buff *buf;
|
|
|
|
/* Ignore "stale" link state info */
|
|
|
|
if (less_eq(last_sent, n_ptr->bclink.last_in))
|
|
return;
|
|
|
|
/* Update link synchronization state; quit if in sync */
|
|
|
|
bclink_update_last_sent(n_ptr, last_sent);
|
|
|
|
if (n_ptr->bclink.last_sent == n_ptr->bclink.last_in)
|
|
return;
|
|
|
|
/* Update out-of-sync state; quit if loss is still unconfirmed */
|
|
|
|
if ((++n_ptr->bclink.oos_state) == 1) {
|
|
if (n_ptr->bclink.deferred_size < (TIPC_MIN_LINK_WIN / 2))
|
|
return;
|
|
n_ptr->bclink.oos_state++;
|
|
}
|
|
|
|
/* Don't NACK if one has been recently sent (or seen) */
|
|
|
|
if (n_ptr->bclink.oos_state & 0x1)
|
|
return;
|
|
|
|
/* Send NACK */
|
|
|
|
buf = tipc_buf_acquire(INT_H_SIZE);
|
|
if (buf) {
|
|
struct tipc_msg *msg = buf_msg(buf);
|
|
|
|
tipc_msg_init(msg, BCAST_PROTOCOL, STATE_MSG,
|
|
INT_H_SIZE, n_ptr->addr);
|
|
msg_set_non_seq(msg, 1);
|
|
msg_set_mc_netid(msg, tipc_net_id);
|
|
msg_set_bcast_ack(msg, n_ptr->bclink.last_in);
|
|
msg_set_bcgap_after(msg, n_ptr->bclink.last_in);
|
|
msg_set_bcgap_to(msg, n_ptr->bclink.deferred_head
|
|
? buf_seqno(n_ptr->bclink.deferred_head) - 1
|
|
: n_ptr->bclink.last_sent);
|
|
|
|
spin_lock_bh(&bc_lock);
|
|
tipc_bearer_send(&bcbearer->bearer, buf, NULL);
|
|
bcl->stats.sent_nacks++;
|
|
spin_unlock_bh(&bc_lock);
|
|
kfree_skb(buf);
|
|
|
|
n_ptr->bclink.oos_state++;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* bclink_peek_nack - monitor retransmission requests sent by other nodes
|
|
*
|
|
* Delay any upcoming NACK by this node if another node has already
|
|
* requested the first message this node is going to ask for.
|
|
*
|
|
* Only tipc_net_lock set.
|
|
*/
|
|
static void bclink_peek_nack(struct tipc_msg *msg)
|
|
{
|
|
struct tipc_node *n_ptr = tipc_node_find(msg_destnode(msg));
|
|
|
|
if (unlikely(!n_ptr))
|
|
return;
|
|
|
|
tipc_node_lock(n_ptr);
|
|
|
|
if (n_ptr->bclink.recv_permitted &&
|
|
(n_ptr->bclink.last_in != n_ptr->bclink.last_sent) &&
|
|
(n_ptr->bclink.last_in == msg_bcgap_after(msg)))
|
|
n_ptr->bclink.oos_state = 2;
|
|
|
|
tipc_node_unlock(n_ptr);
|
|
}
|
|
|
|
/*
|
|
* tipc_bclink_send_msg - broadcast a packet to all nodes in cluster
|
|
*/
|
|
int tipc_bclink_send_msg(struct sk_buff *buf)
|
|
{
|
|
int res;
|
|
|
|
spin_lock_bh(&bc_lock);
|
|
|
|
if (!bclink->bcast_nodes.count) {
|
|
res = msg_data_sz(buf_msg(buf));
|
|
kfree_skb(buf);
|
|
goto exit;
|
|
}
|
|
|
|
res = tipc_link_send_buf(bcl, buf);
|
|
if (likely(res >= 0)) {
|
|
bclink_set_last_sent();
|
|
bcl->stats.queue_sz_counts++;
|
|
bcl->stats.accu_queue_sz += bcl->out_queue_size;
|
|
}
|
|
exit:
|
|
spin_unlock_bh(&bc_lock);
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* bclink_accept_pkt - accept an incoming, in-sequence broadcast packet
|
|
*
|
|
* Called with both sending node's lock and bc_lock taken.
|
|
*/
|
|
static void bclink_accept_pkt(struct tipc_node *node, u32 seqno)
|
|
{
|
|
bclink_update_last_sent(node, seqno);
|
|
node->bclink.last_in = seqno;
|
|
node->bclink.oos_state = 0;
|
|
bcl->stats.recv_info++;
|
|
|
|
/*
|
|
* Unicast an ACK periodically, ensuring that
|
|
* all nodes in the cluster don't ACK at the same time
|
|
*/
|
|
|
|
if (((seqno - tipc_own_addr) % TIPC_MIN_LINK_WIN) == 0) {
|
|
tipc_link_send_proto_msg(
|
|
node->active_links[node->addr & 1],
|
|
STATE_MSG, 0, 0, 0, 0, 0);
|
|
bcl->stats.sent_acks++;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* tipc_bclink_recv_pkt - receive a broadcast packet, and deliver upwards
|
|
*
|
|
* tipc_net_lock is read_locked, no other locks set
|
|
*/
|
|
void tipc_bclink_recv_pkt(struct sk_buff *buf)
|
|
{
|
|
struct tipc_msg *msg = buf_msg(buf);
|
|
struct tipc_node *node;
|
|
u32 next_in;
|
|
u32 seqno;
|
|
int deferred;
|
|
|
|
/* Screen out unwanted broadcast messages */
|
|
|
|
if (msg_mc_netid(msg) != tipc_net_id)
|
|
goto exit;
|
|
|
|
node = tipc_node_find(msg_prevnode(msg));
|
|
if (unlikely(!node))
|
|
goto exit;
|
|
|
|
tipc_node_lock(node);
|
|
if (unlikely(!node->bclink.recv_permitted))
|
|
goto unlock;
|
|
|
|
/* Handle broadcast protocol message */
|
|
|
|
if (unlikely(msg_user(msg) == BCAST_PROTOCOL)) {
|
|
if (msg_type(msg) != STATE_MSG)
|
|
goto unlock;
|
|
if (msg_destnode(msg) == tipc_own_addr) {
|
|
tipc_bclink_acknowledge(node, msg_bcast_ack(msg));
|
|
tipc_node_unlock(node);
|
|
spin_lock_bh(&bc_lock);
|
|
bcl->stats.recv_nacks++;
|
|
bclink->retransmit_to = node;
|
|
bclink_retransmit_pkt(msg_bcgap_after(msg),
|
|
msg_bcgap_to(msg));
|
|
spin_unlock_bh(&bc_lock);
|
|
} else {
|
|
tipc_node_unlock(node);
|
|
bclink_peek_nack(msg);
|
|
}
|
|
goto exit;
|
|
}
|
|
|
|
/* Handle in-sequence broadcast message */
|
|
|
|
seqno = msg_seqno(msg);
|
|
next_in = mod(node->bclink.last_in + 1);
|
|
|
|
if (likely(seqno == next_in)) {
|
|
receive:
|
|
/* Deliver message to destination */
|
|
|
|
if (likely(msg_isdata(msg))) {
|
|
spin_lock_bh(&bc_lock);
|
|
bclink_accept_pkt(node, seqno);
|
|
spin_unlock_bh(&bc_lock);
|
|
tipc_node_unlock(node);
|
|
if (likely(msg_mcast(msg)))
|
|
tipc_port_recv_mcast(buf, NULL);
|
|
else
|
|
kfree_skb(buf);
|
|
} else if (msg_user(msg) == MSG_BUNDLER) {
|
|
spin_lock_bh(&bc_lock);
|
|
bclink_accept_pkt(node, seqno);
|
|
bcl->stats.recv_bundles++;
|
|
bcl->stats.recv_bundled += msg_msgcnt(msg);
|
|
spin_unlock_bh(&bc_lock);
|
|
tipc_node_unlock(node);
|
|
tipc_link_recv_bundle(buf);
|
|
} else if (msg_user(msg) == MSG_FRAGMENTER) {
|
|
int ret;
|
|
ret = tipc_link_frag_rcv(&node->bclink.reasm_head,
|
|
&node->bclink.reasm_tail,
|
|
&buf);
|
|
if (ret == LINK_REASM_ERROR)
|
|
goto unlock;
|
|
spin_lock_bh(&bc_lock);
|
|
bclink_accept_pkt(node, seqno);
|
|
bcl->stats.recv_fragments++;
|
|
if (ret == LINK_REASM_COMPLETE) {
|
|
bcl->stats.recv_fragmented++;
|
|
/* Point msg to inner header */
|
|
msg = buf_msg(buf);
|
|
spin_unlock_bh(&bc_lock);
|
|
goto receive;
|
|
}
|
|
spin_unlock_bh(&bc_lock);
|
|
tipc_node_unlock(node);
|
|
} else if (msg_user(msg) == NAME_DISTRIBUTOR) {
|
|
spin_lock_bh(&bc_lock);
|
|
bclink_accept_pkt(node, seqno);
|
|
spin_unlock_bh(&bc_lock);
|
|
tipc_node_unlock(node);
|
|
tipc_named_recv(buf);
|
|
} else {
|
|
spin_lock_bh(&bc_lock);
|
|
bclink_accept_pkt(node, seqno);
|
|
spin_unlock_bh(&bc_lock);
|
|
tipc_node_unlock(node);
|
|
kfree_skb(buf);
|
|
}
|
|
buf = NULL;
|
|
|
|
/* Determine new synchronization state */
|
|
|
|
tipc_node_lock(node);
|
|
if (unlikely(!tipc_node_is_up(node)))
|
|
goto unlock;
|
|
|
|
if (node->bclink.last_in == node->bclink.last_sent)
|
|
goto unlock;
|
|
|
|
if (!node->bclink.deferred_head) {
|
|
node->bclink.oos_state = 1;
|
|
goto unlock;
|
|
}
|
|
|
|
msg = buf_msg(node->bclink.deferred_head);
|
|
seqno = msg_seqno(msg);
|
|
next_in = mod(next_in + 1);
|
|
if (seqno != next_in)
|
|
goto unlock;
|
|
|
|
/* Take in-sequence message from deferred queue & deliver it */
|
|
|
|
buf = node->bclink.deferred_head;
|
|
node->bclink.deferred_head = buf->next;
|
|
node->bclink.deferred_size--;
|
|
goto receive;
|
|
}
|
|
|
|
/* Handle out-of-sequence broadcast message */
|
|
|
|
if (less(next_in, seqno)) {
|
|
deferred = tipc_link_defer_pkt(&node->bclink.deferred_head,
|
|
&node->bclink.deferred_tail,
|
|
buf);
|
|
node->bclink.deferred_size += deferred;
|
|
bclink_update_last_sent(node, seqno);
|
|
buf = NULL;
|
|
} else
|
|
deferred = 0;
|
|
|
|
spin_lock_bh(&bc_lock);
|
|
|
|
if (deferred)
|
|
bcl->stats.deferred_recv++;
|
|
else
|
|
bcl->stats.duplicates++;
|
|
|
|
spin_unlock_bh(&bc_lock);
|
|
|
|
unlock:
|
|
tipc_node_unlock(node);
|
|
exit:
|
|
kfree_skb(buf);
|
|
}
|
|
|
|
u32 tipc_bclink_acks_missing(struct tipc_node *n_ptr)
|
|
{
|
|
return (n_ptr->bclink.recv_permitted &&
|
|
(tipc_bclink_get_last_sent() != n_ptr->bclink.acked));
|
|
}
|
|
|
|
|
|
/**
|
|
* tipc_bcbearer_send - send a packet through the broadcast pseudo-bearer
|
|
*
|
|
* Send packet over as many bearers as necessary to reach all nodes
|
|
* that have joined the broadcast link.
|
|
*
|
|
* Returns 0 (packet sent successfully) under all circumstances,
|
|
* since the broadcast link's pseudo-bearer never blocks
|
|
*/
|
|
static int tipc_bcbearer_send(struct sk_buff *buf, struct tipc_bearer *unused1,
|
|
struct tipc_media_addr *unused2)
|
|
{
|
|
int bp_index;
|
|
|
|
/* Prepare broadcast link message for reliable transmission,
|
|
* if first time trying to send it;
|
|
* preparation is skipped for broadcast link protocol messages
|
|
* since they are sent in an unreliable manner and don't need it
|
|
*/
|
|
if (likely(!msg_non_seq(buf_msg(buf)))) {
|
|
struct tipc_msg *msg;
|
|
|
|
bcbuf_set_acks(buf, bclink->bcast_nodes.count);
|
|
msg = buf_msg(buf);
|
|
msg_set_non_seq(msg, 1);
|
|
msg_set_mc_netid(msg, tipc_net_id);
|
|
bcl->stats.sent_info++;
|
|
|
|
if (WARN_ON(!bclink->bcast_nodes.count)) {
|
|
dump_stack();
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/* Send buffer over bearers until all targets reached */
|
|
bcbearer->remains = bclink->bcast_nodes;
|
|
|
|
for (bp_index = 0; bp_index < MAX_BEARERS; bp_index++) {
|
|
struct tipc_bearer *p = bcbearer->bpairs[bp_index].primary;
|
|
struct tipc_bearer *s = bcbearer->bpairs[bp_index].secondary;
|
|
struct tipc_bearer *b = p;
|
|
struct sk_buff *tbuf;
|
|
|
|
if (!p)
|
|
break; /* No more bearers to try */
|
|
|
|
tipc_nmap_diff(&bcbearer->remains, &b->nodes,
|
|
&bcbearer->remains_new);
|
|
if (bcbearer->remains_new.count == bcbearer->remains.count)
|
|
continue; /* Nothing added by bearer pair */
|
|
|
|
if (bp_index == 0) {
|
|
/* Use original buffer for first bearer */
|
|
tipc_bearer_send(b, buf, &b->bcast_addr);
|
|
} else {
|
|
/* Avoid concurrent buffer access */
|
|
tbuf = pskb_copy(buf, GFP_ATOMIC);
|
|
if (!tbuf)
|
|
break;
|
|
tipc_bearer_send(b, tbuf, &b->bcast_addr);
|
|
kfree_skb(tbuf); /* Bearer keeps a clone */
|
|
}
|
|
|
|
/* Swap bearers for next packet */
|
|
if (s) {
|
|
bcbearer->bpairs[bp_index].primary = s;
|
|
bcbearer->bpairs[bp_index].secondary = p;
|
|
}
|
|
|
|
if (bcbearer->remains_new.count == 0)
|
|
break; /* All targets reached */
|
|
|
|
bcbearer->remains = bcbearer->remains_new;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* tipc_bcbearer_sort - create sets of bearer pairs used by broadcast bearer
|
|
*/
|
|
void tipc_bcbearer_sort(void)
|
|
{
|
|
struct tipc_bcbearer_pair *bp_temp = bcbearer->bpairs_temp;
|
|
struct tipc_bcbearer_pair *bp_curr;
|
|
int b_index;
|
|
int pri;
|
|
|
|
spin_lock_bh(&bc_lock);
|
|
|
|
/* Group bearers by priority (can assume max of two per priority) */
|
|
memset(bp_temp, 0, sizeof(bcbearer->bpairs_temp));
|
|
|
|
for (b_index = 0; b_index < MAX_BEARERS; b_index++) {
|
|
struct tipc_bearer *b = &tipc_bearers[b_index];
|
|
|
|
if (!b->active || !b->nodes.count)
|
|
continue;
|
|
|
|
if (!bp_temp[b->priority].primary)
|
|
bp_temp[b->priority].primary = b;
|
|
else
|
|
bp_temp[b->priority].secondary = b;
|
|
}
|
|
|
|
/* Create array of bearer pairs for broadcasting */
|
|
bp_curr = bcbearer->bpairs;
|
|
memset(bcbearer->bpairs, 0, sizeof(bcbearer->bpairs));
|
|
|
|
for (pri = TIPC_MAX_LINK_PRI; pri >= 0; pri--) {
|
|
|
|
if (!bp_temp[pri].primary)
|
|
continue;
|
|
|
|
bp_curr->primary = bp_temp[pri].primary;
|
|
|
|
if (bp_temp[pri].secondary) {
|
|
if (tipc_nmap_equal(&bp_temp[pri].primary->nodes,
|
|
&bp_temp[pri].secondary->nodes)) {
|
|
bp_curr->secondary = bp_temp[pri].secondary;
|
|
} else {
|
|
bp_curr++;
|
|
bp_curr->primary = bp_temp[pri].secondary;
|
|
}
|
|
}
|
|
|
|
bp_curr++;
|
|
}
|
|
|
|
spin_unlock_bh(&bc_lock);
|
|
}
|
|
|
|
|
|
int tipc_bclink_stats(char *buf, const u32 buf_size)
|
|
{
|
|
int ret;
|
|
struct tipc_stats *s;
|
|
|
|
if (!bcl)
|
|
return 0;
|
|
|
|
spin_lock_bh(&bc_lock);
|
|
|
|
s = &bcl->stats;
|
|
|
|
ret = tipc_snprintf(buf, buf_size, "Link <%s>\n"
|
|
" Window:%u packets\n",
|
|
bcl->name, bcl->queue_limit[0]);
|
|
ret += tipc_snprintf(buf + ret, buf_size - ret,
|
|
" RX packets:%u fragments:%u/%u bundles:%u/%u\n",
|
|
s->recv_info, s->recv_fragments,
|
|
s->recv_fragmented, s->recv_bundles,
|
|
s->recv_bundled);
|
|
ret += tipc_snprintf(buf + ret, buf_size - ret,
|
|
" TX packets:%u fragments:%u/%u bundles:%u/%u\n",
|
|
s->sent_info, s->sent_fragments,
|
|
s->sent_fragmented, s->sent_bundles,
|
|
s->sent_bundled);
|
|
ret += tipc_snprintf(buf + ret, buf_size - ret,
|
|
" RX naks:%u defs:%u dups:%u\n",
|
|
s->recv_nacks, s->deferred_recv, s->duplicates);
|
|
ret += tipc_snprintf(buf + ret, buf_size - ret,
|
|
" TX naks:%u acks:%u dups:%u\n",
|
|
s->sent_nacks, s->sent_acks, s->retransmitted);
|
|
ret += tipc_snprintf(buf + ret, buf_size - ret,
|
|
" Congestion link:%u Send queue max:%u avg:%u\n",
|
|
s->link_congs, s->max_queue_sz,
|
|
s->queue_sz_counts ?
|
|
(s->accu_queue_sz / s->queue_sz_counts) : 0);
|
|
|
|
spin_unlock_bh(&bc_lock);
|
|
return ret;
|
|
}
|
|
|
|
int tipc_bclink_reset_stats(void)
|
|
{
|
|
if (!bcl)
|
|
return -ENOPROTOOPT;
|
|
|
|
spin_lock_bh(&bc_lock);
|
|
memset(&bcl->stats, 0, sizeof(bcl->stats));
|
|
spin_unlock_bh(&bc_lock);
|
|
return 0;
|
|
}
|
|
|
|
int tipc_bclink_set_queue_limits(u32 limit)
|
|
{
|
|
if (!bcl)
|
|
return -ENOPROTOOPT;
|
|
if ((limit < TIPC_MIN_LINK_WIN) || (limit > TIPC_MAX_LINK_WIN))
|
|
return -EINVAL;
|
|
|
|
spin_lock_bh(&bc_lock);
|
|
tipc_link_set_queue_limits(bcl, limit);
|
|
spin_unlock_bh(&bc_lock);
|
|
return 0;
|
|
}
|
|
|
|
void tipc_bclink_init(void)
|
|
{
|
|
bcbearer->bearer.media = &bcbearer->media;
|
|
bcbearer->media.send_msg = tipc_bcbearer_send;
|
|
sprintf(bcbearer->media.name, "tipc-broadcast");
|
|
|
|
INIT_LIST_HEAD(&bcl->waiting_ports);
|
|
bcl->next_out_no = 1;
|
|
spin_lock_init(&bclink->node.lock);
|
|
bcl->owner = &bclink->node;
|
|
bcl->max_pkt = MAX_PKT_DEFAULT_MCAST;
|
|
tipc_link_set_queue_limits(bcl, BCLINK_WIN_DEFAULT);
|
|
bcl->b_ptr = &bcbearer->bearer;
|
|
bcl->state = WORKING_WORKING;
|
|
strlcpy(bcl->name, tipc_bclink_name, TIPC_MAX_LINK_NAME);
|
|
}
|
|
|
|
void tipc_bclink_stop(void)
|
|
{
|
|
spin_lock_bh(&bc_lock);
|
|
tipc_link_purge_queues(bcl);
|
|
spin_unlock_bh(&bc_lock);
|
|
|
|
memset(bclink, 0, sizeof(*bclink));
|
|
memset(bcbearer, 0, sizeof(*bcbearer));
|
|
}
|
|
|
|
|
|
/**
|
|
* tipc_nmap_add - add a node to a node map
|
|
*/
|
|
void tipc_nmap_add(struct tipc_node_map *nm_ptr, u32 node)
|
|
{
|
|
int n = tipc_node(node);
|
|
int w = n / WSIZE;
|
|
u32 mask = (1 << (n % WSIZE));
|
|
|
|
if ((nm_ptr->map[w] & mask) == 0) {
|
|
nm_ptr->count++;
|
|
nm_ptr->map[w] |= mask;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* tipc_nmap_remove - remove a node from a node map
|
|
*/
|
|
void tipc_nmap_remove(struct tipc_node_map *nm_ptr, u32 node)
|
|
{
|
|
int n = tipc_node(node);
|
|
int w = n / WSIZE;
|
|
u32 mask = (1 << (n % WSIZE));
|
|
|
|
if ((nm_ptr->map[w] & mask) != 0) {
|
|
nm_ptr->map[w] &= ~mask;
|
|
nm_ptr->count--;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* tipc_nmap_diff - find differences between node maps
|
|
* @nm_a: input node map A
|
|
* @nm_b: input node map B
|
|
* @nm_diff: output node map A-B (i.e. nodes of A that are not in B)
|
|
*/
|
|
static void tipc_nmap_diff(struct tipc_node_map *nm_a,
|
|
struct tipc_node_map *nm_b,
|
|
struct tipc_node_map *nm_diff)
|
|
{
|
|
int stop = ARRAY_SIZE(nm_a->map);
|
|
int w;
|
|
int b;
|
|
u32 map;
|
|
|
|
memset(nm_diff, 0, sizeof(*nm_diff));
|
|
for (w = 0; w < stop; w++) {
|
|
map = nm_a->map[w] ^ (nm_a->map[w] & nm_b->map[w]);
|
|
nm_diff->map[w] = map;
|
|
if (map != 0) {
|
|
for (b = 0 ; b < WSIZE; b++) {
|
|
if (map & (1 << b))
|
|
nm_diff->count++;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* tipc_port_list_add - add a port to a port list, ensuring no duplicates
|
|
*/
|
|
void tipc_port_list_add(struct tipc_port_list *pl_ptr, u32 port)
|
|
{
|
|
struct tipc_port_list *item = pl_ptr;
|
|
int i;
|
|
int item_sz = PLSIZE;
|
|
int cnt = pl_ptr->count;
|
|
|
|
for (; ; cnt -= item_sz, item = item->next) {
|
|
if (cnt < PLSIZE)
|
|
item_sz = cnt;
|
|
for (i = 0; i < item_sz; i++)
|
|
if (item->ports[i] == port)
|
|
return;
|
|
if (i < PLSIZE) {
|
|
item->ports[i] = port;
|
|
pl_ptr->count++;
|
|
return;
|
|
}
|
|
if (!item->next) {
|
|
item->next = kmalloc(sizeof(*item), GFP_ATOMIC);
|
|
if (!item->next) {
|
|
pr_warn("Incomplete multicast delivery, no memory\n");
|
|
return;
|
|
}
|
|
item->next->next = NULL;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* tipc_port_list_free - free dynamically created entries in port_list chain
|
|
*
|
|
*/
|
|
void tipc_port_list_free(struct tipc_port_list *pl_ptr)
|
|
{
|
|
struct tipc_port_list *item;
|
|
struct tipc_port_list *next;
|
|
|
|
for (item = pl_ptr->next; item; item = next) {
|
|
next = item->next;
|
|
kfree(item);
|
|
}
|
|
}
|