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List: dccp
Subject: [PATCH 17/17] [TCP/DCCP]: Introduce net_xmit_eval
From: Gerrit Renker <gerrit () erg ! abdn ! ac ! uk>
Date: 2006-10-24 14:01:29
Message-ID: 200610241501.30050 () strip-the-willow
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[TCP/DCCP]: Introduce net_xmit_eval
Throughout the TCP/DCCP (and tunnelling) code, it often happens
that the return code of a transmit function needs to be tested
against NET_XMIT_CN which is a value that does not indicate a
strict error condition.
This patch uses a macro for these recurring situations which is
consistent with the already existing macro net_xmit_errno, saving
on duplicated code.
Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
------------------------------------------------------------------------------
include/linux/netdevice.h | 4 ++++
include/net/ipip.h | 2 +-
net/dccp/ipv4.c | 5 ++---
net/dccp/ipv6.c | 3 +--
net/dccp/output.c | 14 ++------------
net/ipv4/tcp_ipv4.c | 3 +--
net/ipv4/tcp_output.c | 8 +-------
net/ipv6/ip6_tunnel.c | 2 +-
net/ipv6/tcp_ipv6.c | 3 +--
9 files changed, 14 insertions(+), 30 deletions(-)
------------------------------------------------------------------------------
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 9264139..4b6febb 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -67,6 +67,10 @@ #define NET_RX_CN_MOD 3 /* Storm on i
#define NET_RX_CN_HIGH 4 /* The storm is here */
#define NET_RX_BAD 5 /* packet dropped due to kernel error */
+/* NET_XMIT_CN is special. It does not guarantee that this packet is lost. It
+ * indicates that the device will soon be dropping packets, or already drops
+ * some packets of the same priority; prompting us to send less aggressively. */
+#define net_xmit_eval(e) ((e) == NET_XMIT_CN? 0 : (e))
#define net_xmit_errno(e) ((e) != NET_XMIT_CN ? -ENOBUFS : 0)
#endif
diff --git a/net/dccp/ipv4.c b/net/dccp/ipv4.c
index 32d03e4..86eef26 100644
--- a/net/dccp/ipv4.c
+++ b/net/dccp/ipv4.c
@@ -532,8 +532,7 @@ static int dccp_v4_send_response(struct
err = ip_build_and_send_pkt(skb, sk, ireq->loc_addr,
ireq->rmt_addr,
ireq->opt);
- if (err == NET_XMIT_CN)
- err = 0;
+ err = net_xmit_eval(err);
}
out:
@@ -606,7 +605,7 @@ static void dccp_v4_ctl_send_reset(struc
rxskb->nh.iph->saddr, NULL);
bh_unlock_sock(dccp_v4_ctl_socket->sk);
- if (err == NET_XMIT_CN || err == 0) {
+ if (net_xmit_eval(err) == 0) {
DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
}
diff --git a/net/dccp/ipv6.c b/net/dccp/ipv6.c
index 17ddd8b..33dbd65 100644
--- a/net/dccp/ipv6.c
+++ b/net/dccp/ipv6.c
@@ -284,8 +284,7 @@ static int dccp_v6_send_response(struct
skb->csum));
ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
err = ip6_xmit(sk, skb, &fl, opt, 0);
- if (err == NET_XMIT_CN)
- err = 0;
+ err = net_xmit_eval(err);
}
done:
diff --git a/net/dccp/output.c b/net/dccp/output.c
index 1478ace..1d8590b 100644
--- a/net/dccp/output.c
+++ b/net/dccp/output.c
@@ -124,16 +124,7 @@ static int dccp_transmit_skb(struct sock
memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
err = icsk->icsk_af_ops->queue_xmit(skb, 0);
- if (err <= 0)
- return err;
-
- /* NET_XMIT_CN is special. It does not guarantee,
- * that this packet is lost. It tells that device
- * is about to start to drop packets or already
- * drops some packets of the same priority and
- * invokes us to send less aggressively.
- */
- return err == NET_XMIT_CN ? 0 : err;
+ return net_xmit_eval(err);
}
return -ENOBUFS;
}
@@ -421,8 +412,7 @@ int dccp_send_reset(struct sock *sk, enu
if (skb != NULL) {
memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
err = inet_csk(sk)->icsk_af_ops->queue_xmit(skb, 0);
- if (err == NET_XMIT_CN)
- err = 0;
+ return net_xmit_eval(err);
}
}
diff --git a/include/net/ipip.h b/include/net/ipip.h
index f490c3c..8405885 100644
--- a/include/net/ipip.h
+++ b/include/net/ipip.h
@@ -35,7 +35,7 @@ #define IPTUNNEL_XMIT() do { \
ip_send_check(iph); \
\
err = NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, rt->u.dst.dev, dst_output);\
- if (err == NET_XMIT_SUCCESS || err == NET_XMIT_CN) { \
+ if (net_xmit_eval(err) == 0) { \
stats->tx_bytes += pkt_len; \
stats->tx_packets++; \
} else { \
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 22ef8bd..b5adb56 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -662,8 +662,7 @@ static int tcp_v4_send_synack(struct soc
err = ip_build_and_send_pkt(skb, sk, ireq->loc_addr,
ireq->rmt_addr,
ireq->opt);
- if (err == NET_XMIT_CN)
- err = 0;
+ err = net_xmit_eval(err);
}
out:
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index b8872f0..92729f1 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -485,13 +485,7 @@ #define SYSCTL_FLAG_SACK 0x4
tcp_enter_cwr(sk);
- /* NET_XMIT_CN is special. It does not guarantee,
- * that this packet is lost. It tells that device
- * is about to start to drop packets or already
- * drops some packets of the same priority and
- * invokes us to send less aggressively.
- */
- return err == NET_XMIT_CN ? 0 : err;
+ return net_xmit_eval(err);
#undef SYSCTL_FLAG_TSTAMPS
#undef SYSCTL_FLAG_WSCALE
diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
index 84d7ebd..1e54139 100644
--- a/net/ipv6/ip6_tunnel.c
+++ b/net/ipv6/ip6_tunnel.c
@@ -747,7 +747,7 @@ ip6ip6_tnl_xmit(struct sk_buff *skb, str
err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL,
skb->dst->dev, dst_output);
- if (err == NET_XMIT_SUCCESS || err == NET_XMIT_CN) {
+ if (net_xmit_eval(err) == 0) {
stats->tx_bytes += pkt_len;
stats->tx_packets++;
} else {
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 4c2a7c0..12c501b 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -509,8 +509,7 @@ static int tcp_v6_send_synack(struct soc
ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr);
err = ip6_xmit(sk, skb, &fl, opt, 0);
- if (err == NET_XMIT_CN)
- err = 0;
+ err = net_xmit_eval(err);
}
done:
-
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