From: David Wei <davidhwei@xxxxxxxx>
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@xxxxxxxxxxx>
---
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
