netdev - [PATCH bpf-next 13/21] xsk: report ZC multi-buffer capability via xdp

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Message-Id: <20230518180545.159100-14-maciej.fijalkowski@intel.com>
Date: Thu, 18 May 2023 20:05:37 +0200
From: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
To: bpf@...r.kernel.org,
	ast@...nel.org,
	daniel@...earbox.net,
	andrii@...nel.org
Cc: netdev@...r.kernel.org,
	magnus.karlsson@...el.com,
	tirthendu.sarkar@...el.com,
	maciej.fijalkowski@...el.com,
	bjorn@...nel.org
Subject: [PATCH bpf-next 13/21] xsk: report ZC multi-buffer capability via xdp_features

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@...el.com>
---
 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