diff mbox series

[RFC,net-next,2/6] xdp: add xdp_set_features_flag utility routine

Message ID d86f0c2ab7a8b264d05d2852a1f0c34a21937f86.1677153730.git.lorenzo@kernel.org (mailing list archive)
State Superseded
Delegated to: Netdev Maintainers
Headers show
Series update xdp_features flag according to NIC re-configuration | expand

Checks

Context Check Description
netdev/tree_selection success Clearly marked for net-next
netdev/fixes_present success Fixes tag not required for -next series
netdev/subject_prefix success Link
netdev/cover_letter success Series has a cover letter
netdev/patch_count success Link
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 4350 this patch: 4350
netdev/cc_maintainers warning 3 maintainers not CCed: corbet@lwn.net linux-doc@vger.kernel.org alardam@gmail.com
netdev/build_clang success Errors and warnings before: 1015 this patch: 1015
netdev/module_param success Was 0 now: 0
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 4563 this patch: 4563
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 89 lines checked
netdev/kdoc fail Errors and warnings before: 0 this patch: 2
netdev/source_inline success Was 0 now: 0

Commit Message

Lorenzo Bianconi Feb. 23, 2023, 12:11 p.m. UTC 
Introduce xdp_set_features_flag utility routine in order to update
dynamically xdp_features according to the dynamic hw configuration via
ethtool (e.g. changing number of hw rx/tx queues).
Add xdp_clear_features_flag() in order to clear all xdp_feature flag.

Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
---
 Documentation/netlink/specs/netdev.yaml |  1 +
 include/net/xdp.h                       | 11 +++++++++++
 include/uapi/linux/netdev.h             |  2 ++
 net/core/xdp.c                          | 26 ++++++++++++++++++-------
 tools/include/uapi/linux/netdev.h       |  2 ++
 5 files changed, 35 insertions(+), 7 deletions(-)
diff mbox series

Patch

diff --git a/Documentation/netlink/specs/netdev.yaml b/Documentation/netlink/specs/netdev.yaml
index b4dcdae54ffd..8617d1cc68d6 100644
--- a/Documentation/netlink/specs/netdev.yaml
+++ b/Documentation/netlink/specs/netdev.yaml
@@ -7,6 +7,7 @@  definitions:
   -
     type: flags
     name: xdp-act
+    render-max: true
     entries:
       -
         name: basic
diff --git a/include/net/xdp.h b/include/net/xdp.h
index d517bfac937b..41c57b8b1671 100644
--- a/include/net/xdp.h
+++ b/include/net/xdp.h
@@ -428,12 +428,18 @@  MAX_XDP_METADATA_KFUNC,
 #ifdef CONFIG_NET
 u32 bpf_xdp_metadata_kfunc_id(int id);
 bool bpf_dev_bound_kfunc_id(u32 btf_id);
+void xdp_set_features_flag(struct net_device *dev, xdp_features_t val);
 void xdp_features_set_redirect_target(struct net_device *dev, bool support_sg);
 void xdp_features_clear_redirect_target(struct net_device *dev);
 #else
 static inline u32 bpf_xdp_metadata_kfunc_id(int id) { return 0; }
 static inline bool bpf_dev_bound_kfunc_id(u32 btf_id) { return false; }
 
+static inline void
+xdp_set_features_flag(struct net_device *dev, xdp_features_t val)
+{
+}
+
 static inline void
 xdp_features_set_redirect_target(struct net_device *dev, bool support_sg)
 {
@@ -445,4 +451,9 @@  xdp_features_clear_redirect_target(struct net_device *dev)
 }
 #endif
 
+static inline void xdp_clear_features_flag(struct net_device *dev)
+{
+	xdp_set_features_flag(dev, 0);
+}
+
 #endif /* __LINUX_NET_XDP_H__ */
diff --git a/include/uapi/linux/netdev.h b/include/uapi/linux/netdev.h
index 9ee459872600..4c8b517147b0 100644
--- a/include/uapi/linux/netdev.h
+++ b/include/uapi/linux/netdev.h
@@ -33,6 +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,
 };
 
 enum {
diff --git a/net/core/xdp.c b/net/core/xdp.c
index 8c92fc553317..87e654b7d06c 100644
--- a/net/core/xdp.c
+++ b/net/core/xdp.c
@@ -774,20 +774,32 @@  static int __init xdp_metadata_init(void)
 }
 late_initcall(xdp_metadata_init);
 
-void xdp_features_set_redirect_target(struct net_device *dev, bool support_sg)
+void xdp_set_features_flag(struct net_device *dev, xdp_features_t val)
 {
-	dev->xdp_features |= NETDEV_XDP_ACT_NDO_XMIT;
-	if (support_sg)
-		dev->xdp_features |= NETDEV_XDP_ACT_NDO_XMIT_SG;
+	val &= NETDEV_XDP_ACT_MASK;
+	if (dev->xdp_features == val)
+		return;
 
+	dev->xdp_features = val;
 	call_netdevice_notifiers(NETDEV_XDP_FEAT_CHANGE, dev);
 }
+EXPORT_SYMBOL_GPL(xdp_set_features_flag);
+
+void xdp_features_set_redirect_target(struct net_device *dev, bool support_sg)
+{
+	xdp_features_t val = (dev->xdp_features | NETDEV_XDP_ACT_NDO_XMIT);
+
+	if (support_sg)
+		val |= NETDEV_XDP_ACT_NDO_XMIT_SG;
+	xdp_set_features_flag(dev, val);
+}
 EXPORT_SYMBOL_GPL(xdp_features_set_redirect_target);
 
 void xdp_features_clear_redirect_target(struct net_device *dev)
 {
-	dev->xdp_features &= ~(NETDEV_XDP_ACT_NDO_XMIT |
-			       NETDEV_XDP_ACT_NDO_XMIT_SG);
-	call_netdevice_notifiers(NETDEV_XDP_FEAT_CHANGE, dev);
+	xdp_features_t val = dev->xdp_features;
+
+	val &= ~(NETDEV_XDP_ACT_NDO_XMIT | NETDEV_XDP_ACT_NDO_XMIT_SG);
+	xdp_set_features_flag(dev, val);
 }
 EXPORT_SYMBOL_GPL(xdp_features_clear_redirect_target);
diff --git a/tools/include/uapi/linux/netdev.h b/tools/include/uapi/linux/netdev.h
index 9ee459872600..4c8b517147b0 100644
--- a/tools/include/uapi/linux/netdev.h
+++ b/tools/include/uapi/linux/netdev.h
@@ -33,6 +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,
 };
 
 enum {