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| author | Ilpo Järvinen <ilpo.jarvinen@helsinki.fi> | 2009-03-14 14:23:01 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-03-15 20:09:51 -0700 |
| commit | 5861f8e58dd84fc34b691c2e8d4824dea68c360e (patch) | |
| tree | 5c202f6866cca91ded45213cbb1a3d7f75fc6749 /net/ipv4 | |
| parent | 7cd0a63872ac6ef97265f07adc367ca4f984468e (diff) | |
| download | linux-3.10-5861f8e58dd84fc34b691c2e8d4824dea68c360e.tar.gz linux-3.10-5861f8e58dd84fc34b691c2e8d4824dea68c360e.tar.bz2 linux-3.10-5861f8e58dd84fc34b691c2e8d4824dea68c360e.zip | |
tcp: remove pointless .dsack/.num_sacks code
In the pure assignment case, the earlier zeroing is
still in effect.
David S. Miller raised concerns if the ifs are there to avoid
dirtying cachelines. I came to these conclusions:
> We'll be dirty it anyway (now that I check), the first "real" statement
> in tcp_rcv_established is:
>
> tp->rx_opt.saw_tstamp = 0;
>
> ...that'll land on the same dword. :-/
>
> I suppose the blocks are there just because they had more complexity
> inside when they had to calculate the eff_sacks too (maybe it would
> have been better to just remove them in that drop-patch so you would
> have had less head-ache :-)).
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
| -rw-r--r-- | net/ipv4/tcp_input.c | 7 | ||||
| -rw-r--r-- | net/ipv4/tcp_output.c | 3 |
2 files changed, 3 insertions, 7 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index 5ecd7aa2597..cd39d1d02dc 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -4248,8 +4248,7 @@ static void tcp_sack_remove(struct tcp_sock *tp) this_sack++; sp++; } - if (num_sacks != tp->rx_opt.num_sacks) - tp->rx_opt.num_sacks = num_sacks; + tp->rx_opt.num_sacks = num_sacks; } /* This one checks to see if we can put data from the @@ -4325,8 +4324,7 @@ static void tcp_data_queue(struct sock *sk, struct sk_buff *skb) TCP_ECN_accept_cwr(tp, skb); - if (tp->rx_opt.dsack) - tp->rx_opt.dsack = 0; + tp->rx_opt.dsack = 0; /* Queue data for delivery to the user. * Packets in sequence go to the receive queue. @@ -4445,7 +4443,6 @@ drop: /* Initial out of order segment, build 1 SACK. */ if (tcp_is_sack(tp)) { tp->rx_opt.num_sacks = 1; - tp->rx_opt.dsack = 0; tp->selective_acks[0].start_seq = TCP_SKB_CB(skb)->seq; tp->selective_acks[0].end_seq = TCP_SKB_CB(skb)->end_seq; diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c index eb285befdf3..32565803913 100644 --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -441,8 +441,7 @@ static void tcp_options_write(__be32 *ptr, struct tcp_sock *tp, *ptr++ = htonl(sp[this_sack].end_seq); } - if (tp->rx_opt.dsack) - tp->rx_opt.dsack = 0; + tp->rx_opt.dsack = 0; } } |