Commit fbadd83a authored by Maciej Fijalkowski's avatar Maciej Fijalkowski Committed by Alexei Starovoitov
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xdp: reflect tail increase for MEM_TYPE_XSK_BUFF_POOL 



XSK ZC Rx path calculates the size of data that will be posted to XSK Rx
queue via subtracting xdp_buff::data_end from xdp_buff::data.

In bpf_xdp_frags_increase_tail(), when underlying memory type of
xdp_rxq_info is MEM_TYPE_XSK_BUFF_POOL, add offset to data_end in tail
fragment, so that later on user space will be able to take into account
the amount of bytes added by XDP program.

Fixes: 24ea5012 ("xsk: support mbuf on ZC RX")
Signed-off-by: default avatarMaciej Fijalkowski <maciej.fijalkowski@intel.com>
Link: https://lore.kernel.org/r/20240124191602.566724-10-maciej.fijalkowski@intel.com


Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent 3de38c87

net/core/filter.c

+2 −0
Original line number Diff line number Diff line
@@ -4093,6 +4093,8 @@ static int bpf_xdp_frags_increase_tail(struct xdp_buff *xdp, int offset) 
	memset(skb_frag_address(frag) + skb_frag_size(frag), 0, offset);

	skb_frag_size_add(frag, offset);

	sinfo->xdp_frags_size += offset;

	if (rxq->mem.type == MEM_TYPE_XSK_BUFF_POOL)

		xsk_buff_get_tail(xdp)->data_end += offset;



	return 0;

}