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Message-Id: <20231219210357.4029713-10-dw@davidwei.uk>
Date: Tue, 19 Dec 2023 13:03:46 -0800
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 v3 09/20] 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 a4bdc35c7d6f..5b4df0b6a6c0 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1097,6 +1097,7 @@ 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;
@@ -1135,6 +1136,11 @@ 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;
};
};
--
2.39.3
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