netdev - Re: [PATCH net-next-2.6] net: enhance the documentation for rx

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Date:	Mon, 7 Mar 2011 10:54:46 +0100
From:	Jiri Pirko <jpirko@...hat.com>
To:	Nicolas de Pesloüan <nicolas.2p.debian@...e.fr>
Cc:	netdev@...r.kernel.org, davem@...emloft.net, shemminger@...tta.com,
	eric.dumazet@...il.com, kaber@...sh.net, fubar@...ibm.com,
	andy@...yhouse.net
Subject: Re: [PATCH net-next-2.6] net: enhance the documentation for
 rx_handler.

Sun, Mar 06, 2011 at 09:00:08PM CET, nicolas.2p.debian@...e.fr wrote:
>Signed-off-by: Nicolas de Pesloüan <nicolas.2p.debian@...e.fr>
>---
>This apply on top of Jiri's last patch serie, including the last one that
>commented the RX_HANDLER_* values.
>
> include/linux/netdevice.h |   53 ++++++++++++++++++++++++++++++++++++++------
> net/core/dev.c            |    2 +
> 2 files changed, 47 insertions(+), 8 deletions(-)
>
>diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
>index 26e03f9..0c9dc93 100644
>--- a/include/linux/netdevice.h
>+++ b/include/linux/netdevice.h
>@@ -390,15 +390,52 @@ enum gro_result {
> };
> typedef enum gro_result gro_result_t;
> 
>+/**
>+ * enum rx_handler_result - Possible return values for rx_handlers.
>+ * @RX_HANDLER_CONSUMED: skb was consumed by rx_handler, do not process it
>+ * further.
>+ * @RX_HANDLER_ANOTHER: Do another round in receive path. This is indicated in
>+ * case skb->dev was changed by rx_handler.
>+ * @RX_HANDLER_EXACT: Force exact delivery, no wildcard.
>+ * @RX_HANDLER_PASS: Do nothing, passe the skb as if no rx_handler was called.
>+ *
>+ * rx_handlers are functions called from inside __netif_receive_skb(), to do
>+ * special processing of the skb, prior to delivery to protocol handlers.
>+ *
>+ * Currently, a net_device can only have a single rx_handler registered. Trying
>+ * to register a second rx_handler will return -EBUSY.
>+ *
>+ * To register a rx_handler on a net_device, use netdev_rx_handler_register().
>+ * To unregister a rx_handler on a net_device, use
>+ * netdev_rx_handler_unregister().
>+ *
>+ * Upon return, rx_handler is expected to tell __netif_receive_skb() what to
>+ * do with the skb.
>+ *
>+ * If the rx_handler consumed to skb in some way, it should return
>+ * RX_HANDLER_CONSUMED. This is appropriate when the rx_handler arranged for
>+ * the skb to be delivered in some other ways.
>+ *
>+ * If the rx_handler changed skb->dev, to divert the skb to another
>+ * net_device, it should return RX_HANDLER_ANOTHER. The rx_handler for the
>+ * new device will be called if it exists.
>+ *
>+ * If the rx_handler consider the skb should be ignored, it should return
>+ * RX_HANDLER_EXACT. The skb will only be delivered to protocol handlers that
>+ * are registred on exact device (ptype->dev == skb->dev).
>+ *
>+ * If the rx_handler didn't changed skb->dev, but want the skb to be normally 
>+ * delivered, it should return RX_HANDLER_PASS.
>+ * 
>+ * A device without a registered rx_handler will behave as if rx_handler
>+ * returned RX_HANDLER_PASS.
>+ */
>+
> enum rx_handler_result {
>-	RX_HANDLER_CONSUMED,	/* skb was consumed by rx_handler,
>-				   do not process it further. */
>-	RX_HANDLER_ANOTHER,	/* Do another round in receive path.
>-				   This is indicated in case skb->dev
>-				   was changed by rx_handler */
>-	RX_HANDLER_EXACT,	/* Force exact delivery, no wildcard */
>-	RX_HANDLER_PASS,	/* Do nothing, pass the skb as if
>-				   no rx_handler was called */
>+	RX_HANDLER_CONSUMED,
>+	RX_HANDLER_ANOTHER,	
>+	RX_HANDLER_EXACT,
>+	RX_HANDLER_PASS,
> };
> typedef enum rx_handler_result rx_handler_result_t;
> typedef rx_handler_result_t rx_handler_func_t(struct sk_buff **pskb);
>diff --git a/net/core/dev.c b/net/core/dev.c
>index a368223..3630722 100644
>--- a/net/core/dev.c
>+++ b/net/core/dev.c
>@@ -3060,6 +3060,8 @@ out:
>  *	on a failure.
>  *
>  *	The caller must hold the rtnl_mutex.
>+ *
>+ *	For a general description of rx_handler, see enum rx_handler_result.
>  */
> int netdev_rx_handler_register(struct net_device *dev,
> 			       rx_handler_func_t *rx_handler,
>-- 
>1.7.2.3
>
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Reviewed-by: Jiri Pirko <jpirko@...hat.com>

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