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[DCCP]: Only deliver to the CCID rx side in charge

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This is an optimisation to reduce CPU load. The received feedback is now
only directed to the active CCID component, without requiring processing
also by the inactive one.

As a consequence, a similar test in ccid3.c is now redundant and is
also removed.

Justification:

 Currently DCCP works as a unidirectional service, i.e. a listening server
 is not at the same time a connecting client.
 As far as I can see, several modifications are necessary until that
 becomes possible.
 At the present time, received feedback is both fed to the rx/tx CCID
 modules. In unidirectional service, only one of these is active at any
 one time.

Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz>
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
This commit is contained in:
Gerrit Renker 2006-12-10 00:04:43 -02:00 committed by David S. Miller
parent d63d8364cf
commit bf58a381e8
2 changed files with 20 additions and 7 deletions
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6
net/dccp/ccids/ccid3.c
View file

@ -540,11 +540,11 @@ static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
jiffies + usecs_to_jiffies(t_nfb));
/* set idle flag */
hctx->ccid3hctx_idle = 1;
hctx->ccid3hctx_idle = 1;
break;
case TFRC_SSTATE_NO_SENT:
if (dccp_sk(sk)->dccps_role == DCCP_ROLE_CLIENT)
DCCP_WARN("Illegal ACK received - no packet sent\n");
/* XXX when implementing bidirectional rx/tx check this again */
DCCP_WARN("Illegal ACK received - no packet sent\n");
/* fall through */
case TFRC_SSTATE_TERM: /* ignore feedback when closing */
break;

21
net/dccp/input.c
View file

@ -248,8 +248,18 @@ int dccp_rcv_established(struct sock *sk, struct sk_buff *skb,
DCCP_ACKVEC_STATE_RECEIVED))
goto discard;
ccid_hc_rx_packet_recv(dp->dccps_hc_rx_ccid, sk, skb);
ccid_hc_tx_packet_recv(dp->dccps_hc_tx_ccid, sk, skb);
/*
* Deliver to the CCID module in charge.
* FIXME: Currently DCCP operates one-directional only, i.e. a listening
* server is not at the same time a connecting client. There is
* not much sense in delivering to both rx/tx sides at the moment
* (only one is active at a time); when moving to bidirectional
* service, this needs to be revised.
*/
if (dccp_sk(sk)->dccps_role == DCCP_ROLE_SERVER)
ccid_hc_rx_packet_recv(dp->dccps_hc_rx_ccid, sk, skb);
else
ccid_hc_tx_packet_recv(dp->dccps_hc_tx_ccid, sk, skb);
return __dccp_rcv_established(sk, skb, dh, len);
discard:
@ -484,8 +494,11 @@ int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
DCCP_ACKVEC_STATE_RECEIVED))
goto discard;
ccid_hc_rx_packet_recv(dp->dccps_hc_rx_ccid, sk, skb);
ccid_hc_tx_packet_recv(dp->dccps_hc_tx_ccid, sk, skb);
/* XXX see the comments in dccp_rcv_established about this */
if (dccp_sk(sk)->dccps_role == DCCP_ROLE_SERVER)
ccid_hc_rx_packet_recv(dp->dccps_hc_rx_ccid, sk, skb);
else
ccid_hc_tx_packet_recv(dp->dccps_hc_tx_ccid, sk, skb);
}
/*