diff options
| author | Amery Hung <ameryhung@gmail.com> | 2025-09-22 16:33:50 -0700 |
|---|---|---|
| committer | Martin KaFai Lau <martin.lau@kernel.org> | 2025-09-23 13:35:12 -0700 |
| commit | dea1526fbafb55099a788cde0b659530ee5b1c66 (patch) | |
| tree | a72ea9808528d036ee8fde223e14c184289b4004 /include | |
| parent | bpf: Clear pfmemalloc flag when freeing all fragments (diff) | |
| download | linux-dea1526fbafb55099a788cde0b659530ee5b1c66.tar.gz linux-dea1526fbafb55099a788cde0b659530ee5b1c66.zip | |
bpf: Allow bpf_xdp_shrink_data to shrink a frag from head and tail
Move skb_frag_t adjustment into bpf_xdp_shrink_data() and extend its
functionality to be able to shrink an xdp fragment from both head and
tail. In a later patch, bpf_xdp_pull_data() will reuse it to shrink an
xdp fragment from head.
Additionally, in bpf_xdp_frags_shrink_tail(), breaking the loop when
bpf_xdp_shrink_data() returns false (i.e., not releasing the current
fragment) is not necessary as the loop condition, offset > 0, has the
same effect. Remove the else branch to simplify the code.
Signed-off-by: Amery Hung <ameryhung@gmail.com>
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Reviewed-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Link: https://patch.msgid.link/20250922233356.3356453-3-ameryhung@gmail.com
Diffstat (limited to 'include')
| -rw-r--r-- | include/net/xdp_sock_drv.h | 21 |
1 files changed, 18 insertions, 3 deletions
diff --git a/include/net/xdp_sock_drv.h b/include/net/xdp_sock_drv.h index 513c8e9704f6..4f2d3268a676 100644 --- a/include/net/xdp_sock_drv.h +++ b/include/net/xdp_sock_drv.h @@ -160,13 +160,23 @@ static inline struct xdp_buff *xsk_buff_get_frag(const struct xdp_buff *first) return ret; } -static inline void xsk_buff_del_tail(struct xdp_buff *tail) +static inline void xsk_buff_del_frag(struct xdp_buff *xdp) { - struct xdp_buff_xsk *xskb = container_of(tail, struct xdp_buff_xsk, xdp); + struct xdp_buff_xsk *xskb = container_of(xdp, struct xdp_buff_xsk, xdp); list_del(&xskb->list_node); } +static inline struct xdp_buff *xsk_buff_get_head(struct xdp_buff *first) +{ + struct xdp_buff_xsk *xskb = container_of(first, struct xdp_buff_xsk, xdp); + struct xdp_buff_xsk *frag; + + frag = list_first_entry(&xskb->pool->xskb_list, struct xdp_buff_xsk, + list_node); + return &frag->xdp; +} + static inline struct xdp_buff *xsk_buff_get_tail(struct xdp_buff *first) { struct xdp_buff_xsk *xskb = container_of(first, struct xdp_buff_xsk, xdp); @@ -389,8 +399,13 @@ static inline struct xdp_buff *xsk_buff_get_frag(const struct xdp_buff *first) return NULL; } -static inline void xsk_buff_del_tail(struct xdp_buff *tail) +static inline void xsk_buff_del_frag(struct xdp_buff *xdp) +{ +} + +static inline struct xdp_buff *xsk_buff_get_head(struct xdp_buff *first) { + return NULL; } static inline struct xdp_buff *xsk_buff_get_tail(struct xdp_buff *first) |