netdev - Re: [PATCHv2 2/4] Implement loss counting on TFRC-SP receiver

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Date:	Mon, 19 Oct 2009 07:26:12 +0200
From:	Gerrit Renker <gerrit@....abdn.ac.uk>
To:	Ivo Calado <ivocalado@...edded.ufcg.edu.br>
Cc:	dccp@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCHv2 2/4] Implement loss counting on TFRC-SP receiver

| --- dccp_tree_work03.orig/net/dccp/ccids/lib/packet_history_sp.c	2009-10-08 22:58:21.418908270 -0300
| +++ dccp_tree_work03/net/dccp/ccids/lib/packet_history_sp.c	2009-10-08 22:59:07.442411383 -0300
| @@ -243,6 +243,7 @@
|  {
|  	u64 s0 = tfrc_rx_hist_loss_prev(h)->tfrchrx_seqno,
|  	    s1 = tfrc_rx_hist_entry(h, 1)->tfrchrx_seqno,
| +	    n1 = tfrc_rx_hist_entry(h, 1)->tfrchrx_ndp,
|  	    s2 = tfrc_rx_hist_entry(h, 2)->tfrchrx_seqno,
|  	    s3 = DCCP_SKB_CB(skb)->dccpd_seq;
I have removed the old definition of n1, which was further below and which caused this warning.

net/dccp/ccids/lib/packet_history_sp.c:276:7: warning: symbol 'n1' shadows an earlier 
net/dccp/ccids/lib/packet_history_sp.c:247:6: originally declared here

I thought again about the earlier suggestion to make 'num_losses' u64. Since li_losses sums the values
stored in num_losses, it needs to have the same size (currently it is u32). But then another thought is
that if there are so many losses that u32 overflows, then the performance is so bad anyway that it is
better to turn off the receiver. Hence I have reverted it to u32, as per your original patch.

Please find attached a patch of the changes I made. As per posting, I have separated out the dccp.h part,
since it is also useful in general.

View attachment "2.diff" of type "text/x-diff" (992 bytes)