rxrpc: Preset timestamp on Tx sk_buffs
Set the timestamp on sk_buffs holding packets to be transmitted before queueing them because the moment the packet is on the queue it can be seen by the retransmission algorithm - which may see a completely random timestamp. If the retransmission algorithm sees such a timestamp, it may retransmit the packet and, in future, tell the congestion management algorithm that the retransmit timer expired. Signed-off-by: David Howells <dhowells@redhat.com>
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@ -99,6 +99,11 @@ static void rxrpc_queue_packet(struct rxrpc_call *call, struct sk_buff *skb,
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ASSERTCMP(seq, ==, call->tx_top + 1);
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/* We have to set the timestamp before queueing as the retransmit
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* algorithm can see the packet as soon as we queue it.
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*/
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skb->tstamp = ktime_get_real();
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ix = seq & RXRPC_RXTX_BUFF_MASK;
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rxrpc_get_skb(skb, rxrpc_skb_tx_got);
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call->rxtx_annotations[ix] = RXRPC_TX_ANNO_UNACK;
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