BPF needs to know the offsets of fields it tries to access.
Zero-length fields are added to make offsetof() work.
This unfortunately partitions the bitfield (fields across
the zero-length members can't be coalesced).
Reorder bytes 2 and 3, BPF needs to know the offset of fields
previously in byte 3 and some fields in byte 2 should really
be optional.
The two bytes are always in the same cacheline so it should
not matter.
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Link: https://lore.kernel.org/r/20230321014115.997841-3-kuba@kernel.org
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
__u8 ip_summed:2;
__u8 ooo_okay:1;
- __u8 l4_hash:1;
- __u8 sw_hash:1;
- __u8 wifi_acked_valid:1;
- __u8 wifi_acked:1;
- __u8 no_fcs:1;
- /* Indicates the inner headers are valid in the skbuff. */
- __u8 encapsulation:1;
- __u8 encap_hdr_csum:1;
- __u8 csum_valid:1;
-
/* private: */
__u8 __mono_tc_offset[0];
/* public: */
__u8 tc_skip_classify:1;
__u8 tc_at_ingress:1; /* See TC_AT_INGRESS_MASK */
#endif
+
+ __u8 l4_hash:1;
+ __u8 sw_hash:1;
+ __u8 wifi_acked_valid:1;
+ __u8 wifi_acked:1;
+ __u8 no_fcs:1;
+ /* Indicates the inner headers are valid in the skbuff. */
+ __u8 encapsulation:1;
+ __u8 encap_hdr_csum:1;
+ __u8 csum_valid:1;
#ifdef CONFIG_IPV6_NDISC_NODETYPE
__u8 ndisc_nodetype:2;
#endif