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rxrpc: Fix overlapping ACK accounting

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[ Upstream commit 8940ba3cfe ]

Fix accidental overlapping of Rx-phase ACK accounting with Tx-phase ACK
accounting through variables shared between the two.  call->acks_* members
refer to ACKs received in the Tx phase and call->ackr_* members to ACKs
sent/to be sent during the Rx phase.

Fixes: 1a2391c30c ("rxrpc: Fix detection of out of order acks")
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Jeffrey Altman <jaltman@auristor.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
David Howells 2022-05-21 09:03:18 +01:00 committed by Greg Kroah-Hartman
parent cea2196643
commit 9d5c62e63a
2 changed files with 12 additions and 11 deletions
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7
net/rxrpc/ar-internal.h
View file

@ -676,10 +676,9 @@ struct rxrpc_call {
spinlock_t input_lock; /* Lock for packet input to this call */
/* receive-phase ACK management */
/* Receive-phase ACK management (ACKs we send). */
u8 ackr_reason; /* reason to ACK */
rxrpc_serial_t ackr_serial; /* serial of packet being ACK'd */
rxrpc_serial_t ackr_first_seq; /* first sequence number received */
rxrpc_seq_t ackr_prev_seq; /* previous sequence number received */
rxrpc_seq_t ackr_consumed; /* Highest packet shown consumed */
rxrpc_seq_t ackr_seen; /* Highest packet shown seen */
@ -692,8 +691,10 @@ struct rxrpc_call {
#define RXRPC_CALL_RTT_AVAIL_MASK 0xf
#define RXRPC_CALL_RTT_PEND_SHIFT 8
/* transmission-phase ACK management */
/* Transmission-phase ACK management (ACKs we've received). */
ktime_t acks_latest_ts; /* Timestamp of latest ACK received */
rxrpc_seq_t acks_first_seq; /* first sequence number received */
rxrpc_seq_t acks_prev_seq; /* previous sequence number received */
rxrpc_seq_t acks_lowest_nak; /* Lowest NACK in the buffer (or ==tx_hard_ack) */
rxrpc_seq_t acks_lost_top; /* tx_top at the time lost-ack ping sent */
rxrpc_serial_t acks_lost_ping; /* Serial number of probe ACK */

16
net/rxrpc/input.c
View file

@ -812,7 +812,7 @@ static void rxrpc_input_soft_acks(struct rxrpc_call *call, u8 *acks,
static bool rxrpc_is_ack_valid(struct rxrpc_call *call,
rxrpc_seq_t first_pkt, rxrpc_seq_t prev_pkt)
{
rxrpc_seq_t base = READ_ONCE(call->ackr_first_seq);
rxrpc_seq_t base = READ_ONCE(call->acks_first_seq);
if (after(first_pkt, base))
return true; /* The window advanced */
@ -820,7 +820,7 @@ static bool rxrpc_is_ack_valid(struct rxrpc_call *call,
if (before(first_pkt, base))
return false; /* firstPacket regressed */
if (after_eq(prev_pkt, call->ackr_prev_seq))
if (after_eq(prev_pkt, call->acks_prev_seq))
return true; /* previousPacket hasn't regressed. */
/* Some rx implementations put a serial number in previousPacket. */
@ -933,8 +933,8 @@ static void rxrpc_input_ack(struct rxrpc_call *call, struct sk_buff *skb)
/* Discard any out-of-order or duplicate ACKs (outside lock). */
if (!rxrpc_is_ack_valid(call, first_soft_ack, prev_pkt)) {
trace_rxrpc_rx_discard_ack(call->debug_id, ack_serial,
first_soft_ack, call->ackr_first_seq,
prev_pkt, call->ackr_prev_seq);
first_soft_ack, call->acks_first_seq,
prev_pkt, call->acks_prev_seq);
return;
}
@ -949,14 +949,14 @@ static void rxrpc_input_ack(struct rxrpc_call *call, struct sk_buff *skb)
/* Discard any out-of-order or duplicate ACKs (inside lock). */
if (!rxrpc_is_ack_valid(call, first_soft_ack, prev_pkt)) {
trace_rxrpc_rx_discard_ack(call->debug_id, ack_serial,
first_soft_ack, call->ackr_first_seq,
prev_pkt, call->ackr_prev_seq);
first_soft_ack, call->acks_first_seq,
prev_pkt, call->acks_prev_seq);
goto out;
}
call->acks_latest_ts = skb->tstamp;
call->ackr_first_seq = first_soft_ack;
call->ackr_prev_seq = prev_pkt;
call->acks_first_seq = first_soft_ack;
call->acks_prev_seq = prev_pkt;
/* Parse rwind and mtu sizes if provided. */
if (buf.info.rxMTU)