Messages in this thread | | | Date | Tue, 05 Jan 2010 20:27:21 +0100 | From | Eric Dumazet <> | Subject | Re: [PATCH] net: packet: option to only pass skb protocol |
| |
Le 05/01/2010 19:57, Michael S. Tsirkin a écrit : > When sending packets with a packet socket it is often necessary to set > protocol in msg_name: otherwise the protocol field in the skb will not > be set correctly. However, currently doing this also requires > supplying the interface index. > > The following patch makes it possible to avoid supplying the interface > index by interpreting index 0 as "use device this socket is bound to". >
Patch is correct, but I dont understand why zero initialization by caller is any better then supplying ifindex (known when socket was bound to device ?)
To avoid one syscall at socket setup (to get ifindex from dev name), you prefer to add a test/branch at each send() syscall...
Am I missing something ? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |