netdev - [RFC PATCH bpf-next 07/12] net: added netdevice operation for Tx

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Date:   Tue, 15 May 2018 21:06:10 +0200
From:   Björn Töpel <bjorn.topel@...il.com>
To:     bjorn.topel@...il.com, magnus.karlsson@...il.com,
        magnus.karlsson@...el.com, alexander.h.duyck@...el.com,
        alexander.duyck@...il.com, john.fastabend@...il.com, ast@...com,
        brouer@...hat.com, willemdebruijn.kernel@...il.com,
        daniel@...earbox.net, mst@...hat.com, netdev@...r.kernel.org
Cc:     michael.lundkvist@...csson.com, jesse.brandeburg@...el.com,
        anjali.singhai@...el.com, qi.z.zhang@...el.com,
        intel-wired-lan@...ts.osuosl.org
Subject: [RFC PATCH bpf-next 07/12] net: added netdevice operation for Tx

From: Magnus Karlsson <magnus.karlsson@...el.com>

Added ndo_xsk_async_xmit. This ndo "kicks" the netdev to start pull
userland Tx frames from a NAPI context.

Signed-off-by: Magnus Karlsson <magnus.karlsson@...el.com>
---
 include/linux/netdevice.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 2084536ad4af..8f4292dc6670 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1385,6 +1385,12 @@ struct net_device_ops {
 	int			(*ndo_xdp_xmit)(struct net_device *dev,
 						struct xdp_frame *xdp);
 	void			(*ndo_xdp_flush)(struct net_device *dev);
+	/* AF_XDP Tx function. NB! That in the PoC we take ownership
+	 * of the XDP Tx rings, so you wont be able to XDP_REDIRECT
+	 * there...
+	 */
+	int			(*ndo_xsk_async_xmit)(struct net_device *dev,
+						      u32 queue_id);
 };
 
 /**
-- 
2.14.1