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tipc: include retrans failure detection for unicast 

In patch series, commit 9195948fbf ("tipc: improve TIPC throughput by
Gap ACK blocks"), as for simplicity, the repeated retransmit failures'
detection in the function - "tipc_link_retrans()" was kept there for
broadcast retransmissions only.

This commit now reapplies this feature for link unicast retransmissions
that has been done via the function - "tipc_link_advance_transmq()".

Also, the "tipc_link_retrans()" is renamed to "tipc_link_bc_retrans()"
as it is used only for broadcast.

Acked-by: Jon Maloy <jon.maloy@ericsson.se>
Signed-off-by: Tuong Lien <tuong.t.lien@dektech.com.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tuong Lien 2019-06-17 12:15:42 +07:00 committed by David S. Miller
parent 9ed68ca0d9
commit 6a6b5c8bff
1 changed files with 70 additions and 36 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

106
net/tipc/link.c
View File

@ -249,9 +249,9 @@ static void tipc_link_build_bc_init_msg(struct tipc_link *l,
struct sk_buff_head *xmitq);
static bool tipc_link_release_pkts(struct tipc_link *l, u16 to);
static u16 tipc_build_gap_ack_blks(struct tipc_link *l, void *data);
static void tipc_link_advance_transmq(struct tipc_link *l, u16 acked, u16 gap,
struct tipc_gap_ack_blks *ga,
struct sk_buff_head *xmitq);
static int tipc_link_advance_transmq(struct tipc_link *l, u16 acked, u16 gap,
struct tipc_gap_ack_blks *ga,
struct sk_buff_head *xmitq);
/*
* Simple non-static link routines (i.e. referenced outside this file)
@ -1044,32 +1044,69 @@ static void tipc_link_advance_backlog(struct tipc_link *l,
l->snd_nxt = seqno;
}
static void link_retransmit_failure(struct tipc_link *l, struct sk_buff *skb)
/**
* link_retransmit_failure() - Detect repeated retransmit failures
* @l: tipc link sender
* @r: tipc link receiver (= l in case of unicast)
* @from: seqno of the 1st packet in retransmit request
* @rc: returned code
*
* Return: true if the repeated retransmit failures happens, otherwise
* false
*/
static bool link_retransmit_failure(struct tipc_link *l, struct tipc_link *r,
u16 from, int *rc)
{
struct tipc_msg *hdr = buf_msg(skb);
struct sk_buff *skb = skb_peek(&l->transmq);
struct tipc_msg *hdr;
pr_warn("Retransmission failure on link <%s>\n", l->name);
link_print(l, "State of link ");
pr_info("Failed msg: usr %u, typ %u, len %u, err %u\n",
msg_user(hdr), msg_type(hdr), msg_size(hdr), msg_errcode(hdr));
pr_info("sqno %u, prev: %x, src: %x\n",
msg_seqno(hdr), msg_prevnode(hdr), msg_orignode(hdr));
if (!skb)
return false;
hdr = buf_msg(skb);
/* Detect repeated retransmit failures on same packet */
if (r->prev_from != from) {
r->prev_from = from;
r->stale_limit = jiffies + msecs_to_jiffies(r->tolerance);
r->stale_cnt = 0;
} else if (++r->stale_cnt > 99 && time_after(jiffies, r->stale_limit)) {
pr_warn("Retransmission failure on link <%s>\n", l->name);
link_print(l, "State of link ");
pr_info("Failed msg: usr %u, typ %u, len %u, err %u\n",
msg_user(hdr), msg_type(hdr), msg_size(hdr),
msg_errcode(hdr));
pr_info("sqno %u, prev: %x, src: %x\n",
msg_seqno(hdr), msg_prevnode(hdr), msg_orignode(hdr));
trace_tipc_list_dump(&l->transmq, true, "retrans failure!");
trace_tipc_link_dump(l, TIPC_DUMP_NONE, "retrans failure!");
trace_tipc_link_dump(r, TIPC_DUMP_NONE, "retrans failure!");
if (link_is_bc_sndlink(l))
*rc = TIPC_LINK_DOWN_EVT;
*rc = tipc_link_fsm_evt(l, LINK_FAILURE_EVT);
return true;
}
return false;
}
/* tipc_link_retrans() - retransmit one or more packets
/* tipc_link_bc_retrans() - retransmit zero or more packets
* @l: the link to transmit on
* @r: the receiving link ordering the retransmit. Same as l if unicast
* @from: retransmit from (inclusive) this sequence number
* @to: retransmit to (inclusive) this sequence number
* xmitq: queue for accumulating the retransmitted packets
*/
static int tipc_link_retrans(struct tipc_link *l, struct tipc_link *r,
u16 from, u16 to, struct sk_buff_head *xmitq)
static int tipc_link_bc_retrans(struct tipc_link *l, struct tipc_link *r,
u16 from, u16 to, struct sk_buff_head *xmitq)
{
struct sk_buff *_skb, *skb = skb_peek(&l->transmq);
u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1;
u16 ack = l->rcv_nxt - 1;
struct tipc_msg *hdr;
int rc = 0;
if (!skb)
return 0;
@ -1077,20 +1114,9 @@ static int tipc_link_retrans(struct tipc_link *l, struct tipc_link *r,
return 0;
trace_tipc_link_retrans(r, from, to, &l->transmq);
/* Detect repeated retransmit failures on same packet */
if (r->prev_from != from) {
r->prev_from = from;
r->stale_limit = jiffies + msecs_to_jiffies(r->tolerance);
r->stale_cnt = 0;
} else if (++r->stale_cnt > 99 && time_after(jiffies, r->stale_limit)) {
link_retransmit_failure(l, skb);
trace_tipc_list_dump(&l->transmq, true, "retrans failure!");
trace_tipc_link_dump(l, TIPC_DUMP_NONE, "retrans failure!");
trace_tipc_link_dump(r, TIPC_DUMP_NONE, "retrans failure!");
if (link_is_bc_sndlink(l))
return TIPC_LINK_DOWN_EVT;
return tipc_link_fsm_evt(l, LINK_FAILURE_EVT);
}
if (link_retransmit_failure(l, r, from, &rc))
return rc;
skb_queue_walk(&l->transmq, skb) {
hdr = buf_msg(skb);
@ -1324,17 +1350,23 @@ exit:
* @gap: # of gap packets
* @ga: buffer pointer to Gap ACK blocks from peer
* @xmitq: queue for accumulating the retransmitted packets if any
*
* In case of a repeated retransmit failures, the call will return shortly
* with a returned code (e.g. TIPC_LINK_DOWN_EVT)
*/
static void tipc_link_advance_transmq(struct tipc_link *l, u16 acked, u16 gap,
struct tipc_gap_ack_blks *ga,
struct sk_buff_head *xmitq)
static int tipc_link_advance_transmq(struct tipc_link *l, u16 acked, u16 gap,
struct tipc_gap_ack_blks *ga,
struct sk_buff_head *xmitq)
{
struct sk_buff *skb, *_skb, *tmp;
struct tipc_msg *hdr;
u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1;
u16 ack = l->rcv_nxt - 1;
u16 seqno;
u16 n = 0;
u16 seqno, n = 0;
int rc = 0;
if (gap && link_retransmit_failure(l, l, acked + 1, &rc))
return rc;
skb_queue_walk_safe(&l->transmq, skb, tmp) {
seqno = buf_seqno(skb);
@ -1369,6 +1401,8 @@ next_gap_ack:
goto next_gap_ack;
}
}
return 0;
}
/* tipc_link_build_state_msg: prepare link state message for transmission
@ -1919,7 +1953,7 @@ static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb,
tipc_link_build_proto_msg(l, STATE_MSG, 0, reply,
rcvgap, 0, 0, xmitq);
tipc_link_advance_transmq(l, ack, gap, ga, xmitq);
rc |= tipc_link_advance_transmq(l, ack, gap, ga, xmitq);
/* If NACK, retransmit will now start at right position */
if (gap)
@ -2036,7 +2070,7 @@ int tipc_link_bc_sync_rcv(struct tipc_link *l, struct tipc_msg *hdr,
if (more(peers_snd_nxt, l->rcv_nxt + l->window))
return rc;
rc = tipc_link_retrans(snd_l, l, from, to, xmitq);
rc = tipc_link_bc_retrans(snd_l, l, from, to, xmitq);
l->snd_nxt = peers_snd_nxt;
if (link_bc_rcv_gap(l))
@ -2132,7 +2166,7 @@ int tipc_link_bc_nack_rcv(struct tipc_link *l, struct sk_buff *skb,
if (dnode == tipc_own_addr(l->net)) {
tipc_link_bc_ack_rcv(l, acked, xmitq);
rc = tipc_link_retrans(l->bc_sndlink, l, from, to, xmitq);
rc = tipc_link_bc_retrans(l->bc_sndlink, l, from, to, xmitq);
l->stats.recv_nacks++;
return rc;
}