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| author | Gerrit Renker <gerrit@erg.abdn.ac.uk> | 2006-11-14 11:21:36 -0200 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2006-12-02 21:22:27 -0800 |
| commit | b9df3cb8cf9a96e63dfdcd3056a9cbc71f2459e7 (patch) | |
| tree | 46d19124b1bbfd9eaa26af3d6ba2293b4e8f326d /include/linux/netdevice.h | |
| parent | 1ed176a801b83915b7c8ab80e0a2a6376a2d6051 (diff) | |
| download | lwn-b9df3cb8cf9a96e63dfdcd3056a9cbc71f2459e7.tar.gz lwn-b9df3cb8cf9a96e63dfdcd3056a9cbc71f2459e7.zip | |
[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>
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Diffstat (limited to 'include/linux/netdevice.h')
| -rw-r--r-- | include/linux/netdevice.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index 4e967b2e22cc..caa3c2593719 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -66,6 +66,10 @@ struct netpoll_info; #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 |