Introduce new xdp_feature NETDEV_XDP_ACT_NDO_ZC_SG that will be used to
find out if user space that wants to do ZC multi-buffer will be able to
do so against underlying ZC driver.
Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@xxxxxxxxx>
---
include/uapi/linux/netdev.h | 4 ++--
net/xdp/xsk_buff_pool.c | 6 ++++++
2 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/include/uapi/linux/netdev.h b/include/uapi/linux/netdev.h
index 639524b59930..bfca07224f7b 100644
--- a/include/uapi/linux/netdev.h
+++ b/include/uapi/linux/netdev.h
@@ -33,8 +33,8 @@ enum netdev_xdp_act {
NETDEV_XDP_ACT_HW_OFFLOAD = 16,
NETDEV_XDP_ACT_RX_SG = 32,
NETDEV_XDP_ACT_NDO_XMIT_SG = 64,
-
- NETDEV_XDP_ACT_MASK = 127,
+ NETDEV_XDP_ACT_NDO_ZC_SG = 128,
+ NETDEV_XDP_ACT_MASK = 255,
};
enum {
diff --git a/net/xdp/xsk_buff_pool.c b/net/xdp/xsk_buff_pool.c
index 0a9f8ea68de3..43cca5fa90cf 100644
--- a/net/xdp/xsk_buff_pool.c
+++ b/net/xdp/xsk_buff_pool.c
@@ -189,6 +189,12 @@ int xp_assign_dev(struct xsk_buff_pool *pool,
goto err_unreg_pool;
}
+ if (!(netdev->xdp_features & NETDEV_XDP_ACT_NDO_ZC_SG) &&
+ flags & XDP_USE_SG) {
+ err = -EOPNOTSUPP;
+ goto err_unreg_pool;
+ }
+
bpf.command = XDP_SETUP_XSK_POOL;
bpf.xsk.pool = pool;
bpf.xsk.queue_id = queue_id;
--
2.34.1
