diff mbox series

[bpf-next,1/2] xsk: support redirect to any socket bound to the same umem

Message ID 20240205123553.22180-2-magnus.karlsson@gmail.com (mailing list archive)
State Accepted
Commit 2863d665ea41282379f108e4da6c8a2366ba66db
Delegated to: BPF
Headers show
Series xsk: support redirect to any socket bound to the same umem | expand

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Commit Message

Magnus Karlsson Feb. 5, 2024, 12:35 p.m. UTC 
From: Magnus Karlsson <magnus.karlsson@intel.com>

Add support for directing a packet to any socket bound to the same
umem. This makes it possible to use the XDP program to select what
socket the packet should be received on. The user can populate the
XSKMAP with various sockets and as long as they share the same umem,
the XDP program can pick any one of them.

Suggested-by: Yuval El-Hanany <yuvale@radware.com>
Signed-off-by: Magnus Karlsson <magnus.karlsson@intel.com>
---
 net/xdp/xsk.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

Comments

Willem de Bruijn Feb. 5, 2024, 2:26 p.m. UTC | #1 
Magnus Karlsson wrote:
> From: Magnus Karlsson <magnus.karlsson@intel.com>
> 
> Add support for directing a packet to any socket bound to the same
> umem. This makes it possible to use the XDP program to select what
> socket the packet should be received on. The user can populate the
> XSKMAP with various sockets and as long as they share the same umem,
> the XDP program can pick any one of them.
> 
> Suggested-by: Yuval El-Hanany <yuvale@radware.com>
> Signed-off-by: Magnus Karlsson <magnus.karlsson@intel.com>

Reviewed-by: Willem de Bruijn <willemb@google.com>

This will greatly simplify using AF_XDP sockets with standard RSS.

A socket can be attached to each NIC receive queue, and regardless to
which queue RSS directs a packet, the XDP program can pass it to the
AF_XDP socket that is the intended target.

In the trivial case a single AF_XDP socket receives all XDP_REDIRECT
traffic for the entire device. Similar to how a single PF_PACKET
socket can access all ingress traffic.

Though N fill queues still need to be maintained of course.

> ---
>  net/xdp/xsk.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c
> index 1eadfac03cc4..a339e9a1b557 100644
> --- a/net/xdp/xsk.c
> +++ b/net/xdp/xsk.c
> @@ -313,10 +313,13 @@ static bool xsk_is_bound(struct xdp_sock *xs)
>  
>  static int xsk_rcv_check(struct xdp_sock *xs, struct xdp_buff *xdp, u32 len)
>  {
> +	struct net_device *dev = xdp->rxq->dev;
> +	u32 qid = xdp->rxq->queue_index;
> +
>  	if (!xsk_is_bound(xs))
>  		return -ENXIO;
>  
> -	if (xs->dev != xdp->rxq->dev || xs->queue_id != xdp->rxq->queue_index)
> +	if (!dev->_rx[qid].pool || xs->umem != dev->_rx[qid].pool->umem)
>  		return -EINVAL;
>  
>  	if (len > xsk_pool_get_rx_frame_size(xs->pool) && !xs->sg) {
> -- 
> 2.42.0
>
diff mbox series

Patch

diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c
index 1eadfac03cc4..a339e9a1b557 100644
--- a/net/xdp/xsk.c
+++ b/net/xdp/xsk.c
@@ -313,10 +313,13 @@  static bool xsk_is_bound(struct xdp_sock *xs)
 
 static int xsk_rcv_check(struct xdp_sock *xs, struct xdp_buff *xdp, u32 len)
 {
+	struct net_device *dev = xdp->rxq->dev;
+	u32 qid = xdp->rxq->queue_index;
+
 	if (!xsk_is_bound(xs))
 		return -ENXIO;
 
-	if (xs->dev != xdp->rxq->dev || xs->queue_id != xdp->rxq->queue_index)
+	if (!dev->_rx[qid].pool || xs->umem != dev->_rx[qid].pool->umem)
 		return -EINVAL;
 
 	if (len > xsk_pool_get_rx_frame_size(xs->pool) && !xs->sg) {