netdev - [RFC PATCH v4 07/16] netdev: add XDP_SETUP_ZC

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Date: Tue, 12 Mar 2024 14:44:21 -0700
From: David Wei <dw@...idwei.uk>
To: io-uring@...r.kernel.org,
	netdev@...r.kernel.org
Cc: Jens Axboe <axboe@...nel.dk>,
	Pavel Begunkov <asml.silence@...il.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jesper Dangaard Brouer <hawk@...nel.org>,
	David Ahern <dsahern@...nel.org>,
	Mina Almasry <almasrymina@...gle.com>
Subject: [RFC PATCH v4 07/16] netdev: add XDP_SETUP_ZC_RX command

From: David Wei <davidhwei@...a.com>

RFC only, not for upstream.
This will be replaced with a separate ndo callback or some other
mechanism in next patchset revisions.

This patch adds a new XDP_SETUP_ZC_RX command that will be used in a
later patch to enable or disable ZC RX for a specific RX queue.

We are open to suggestions on a better way of doing this. Google's TCP
devmem proposal sets up struct netdev_rx_queue which persists across
device reset, then expects userspace to use an out-of-band method (e.g.
ethtool) to reset the device, thus re-filling a hardware Rx queue.

Signed-off-by: David Wei <dw@...idwei.uk>
---
 include/linux/netdevice.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index ac7102118d68..699cce69a5a6 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1009,6 +1009,7 @@ enum bpf_netdev_command {
 	BPF_OFFLOAD_MAP_ALLOC,
 	BPF_OFFLOAD_MAP_FREE,
 	XDP_SETUP_XSK_POOL,
+	XDP_SETUP_ZC_RX,
 };
 
 struct bpf_prog_offload_ops;
@@ -1047,6 +1048,11 @@ struct netdev_bpf {
 			struct xsk_buff_pool *pool;
 			u16 queue_id;
 		} xsk;
+		/* XDP_SETUP_ZC_RX */
+		struct {
+			struct io_zc_rx_ifq *ifq;
+			u16 queue_id;
+		} zc_rx;
 	};
 };
 
-- 
2.43.0