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Re: [PATCH] NETIF_F_LLTX for devices 2

To: Andi Kleen <ak@xxxxxxx>
Subject: Re: [PATCH] NETIF_F_LLTX for devices 2
From: Francois Romieu <romieu@xxxxxxxxxxxxx>
Date: Sun, 12 Sep 2004 13:03:20 +0200
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>, hadi@xxxxxxxxxx, herbert@xxxxxxxxxxxxxxxxxxx, netdev@xxxxxxxxxxx
In-reply-to: <20040912102529.GA27096@xxxxxxxxxxxxx>
References: <E1C4wYe-0005qT-00@xxxxxxxxxxxxxxxxxxxxxxxx> <20040908072408.GI27886@xxxxxxxxxxxxx> <1094629677.1089.155.camel@xxxxxxxxxxxxxxxx> <20040908134713.1bcd46d3.davem@xxxxxxxxxxxxx> <1094823215.1121.129.camel@xxxxxxxxxxxxxxxx> <20040911142116.GL4431@xxxxxxxxxxxxx> <1094933731.2343.109.camel@xxxxxxxxxxxxxxxx> <20040911174535.2acbb957.davem@xxxxxxxxxxxxx> <20040912100114.GB11484@xxxxxxxxxxxxx> <20040912102529.GA27096@xxxxxxxxxxxxx>
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Andi Kleen <ak@xxxxxxx> :
[...]
> I wasn't aware of Documentation/netdevices.txt, but I agree it 
> would be a good idea to update it. Patch for that attached.
> DaveM, please apply.

I have modified your patch so as to include a bit from a message
of Jamal on netdev the 05/07/2004.

diff -u linux-2.6.8-work/Documentation/networking/netdevices.txt-o 
linux-2.6.8-work/Documentation/networking/netdevices.txt
--- linux-2.6.8-work/Documentation/networking/netdevices.txt-o  2004-03-21 
21:12:11.000000000 +0100
+++ linux-2.6.8-work/Documentation/networking/netdevices.txt    2004-09-12 
12:24:02.000000000 +0200
@@ -43,8 +43,21 @@
 
 dev->hard_start_xmit:
        Synchronization: dev->xmit_lock spinlock.
+       When the driver sets NETIF_F_LLTX in dev->features this will be
+       called without holding xmit_lock. In this case the driver 
+       has to lock by itself when needed. It is recommended to use a try lock
+       for this and return -1 when the spin lock fails. 
+       The locking there should also properly protect against 
+       set_multicast_list
        Context: BHs disabled
        Notes: netif_queue_stopped() is guaranteed false
+       Return codes: 
+       o 0 everything ok. 
+       o 1 Cannot transmit packet, try later 
+         Usually a bug, means queue start/stop flow control is broken in
+         the driver. Note: the driver must NOT put the skb in its DMA ring.
+       o -1 Locking failed, please retry quickly. Only valid when 
+         NETIF_F_LLTX is set.
 
 dev->tx_timeout:
        Synchronization: dev->xmit_lock spinlock.



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