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sctp: reuse sent_count to avoid retransmitted chunks for RTT measurements
Now sctp uses chunk->resent to record if a chunk is retransmitted, for RTT measurements with retransmitted DATA chunks. chunk->sent_count was introduced to record how many times one chunk has been sent for prsctp RTX policy before. We actually can know if one chunk is retransmitted by checking chunk->sent_count is greater than 1. This patch is to remove resent from sctp_chunk and reuse sent_count to avoid retransmitted chunks for RTT measurements. Signed-off-by: Xin Long <lucien.xin@gmail.com> Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -641,7 +641,6 @@ struct sctp_chunk {
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#define SCTP_NEED_FRTX 0x1
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#define SCTP_DONT_FRTX 0x2
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__u16 rtt_in_progress:1, /* This chunk used for RTT calc? */
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resent:1, /* Has this chunk ever been resent. */
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has_tsn:1, /* Does this chunk have a TSN yet? */
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has_ssn:1, /* Does this chunk have a SSN yet? */
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singleton:1, /* Only chunk in the packet? */
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@ -656,6 +655,7 @@ struct sctp_chunk {
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fast_retransmit:2; /* Is this chunk fast retransmitted? */
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};
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#define sctp_chunk_retransmitted(chunk) (chunk->sent_count > 1)
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void sctp_chunk_hold(struct sctp_chunk *);
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void sctp_chunk_put(struct sctp_chunk *);
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int sctp_user_addto_chunk(struct sctp_chunk *chunk, int len,
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@ -552,7 +552,8 @@ int sctp_packet_transmit(struct sctp_packet *packet, gfp_t gfp)
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* for a given destination transport address.
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*/
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if (!chunk->resent && !tp->rto_pending) {
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if (!sctp_chunk_retransmitted(chunk) &&
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!tp->rto_pending) {
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chunk->rtt_in_progress = 1;
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tp->rto_pending = 1;
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}
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@ -507,8 +507,6 @@ void sctp_retransmit_mark(struct sctp_outq *q,
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transport->rto_pending = 0;
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}
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chunk->resent = 1;
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/* Move the chunk to the retransmit queue. The chunks
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* on the retransmit queue are always kept in order.
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*/
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@ -1439,7 +1437,7 @@ static void sctp_check_transmitted(struct sctp_outq *q,
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* instance).
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*/
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if (!tchunk->tsn_gap_acked &&
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!tchunk->resent &&
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!sctp_chunk_retransmitted(tchunk) &&
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tchunk->rtt_in_progress) {
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tchunk->rtt_in_progress = 0;
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rtt = jiffies - tchunk->sent_at;
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