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authorGerrit Renker <gerrit@erg.abdn.ac.uk>2006-11-14 11:21:36 -0200
committerDavid S. Miller <davem@sunset.davemloft.net>2006-12-02 21:22:27 -0800
commitb9df3cb8cf9a96e63dfdcd3056a9cbc71f2459e7 (patch)
tree46d19124b1bbfd9eaa26af3d6ba2293b4e8f326d /include/linux/netdevice.h
parent1ed176a801b83915b7c8ab80e0a2a6376a2d6051 (diff)
downloadop-kernel-dev-b9df3cb8cf9a96e63dfdcd3056a9cbc71f2459e7.zip
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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> Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Diffstat (limited to 'include/linux/netdevice.h')
-rw-r--r--include/linux/netdevice.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 4e967b2..caa3c259 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
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