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xdp: reflect tail increase for MEM_TYPE_XSK_BUFF_POOL

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[ Upstream commit fbadd83a61 ]

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: 24ea50127e ("xsk: support mbuf on ZC RX")
Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Link: https://lore.kernel.org/r/20240124191602.566724-10-maciej.fijalkowski@intel.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Maciej Fijalkowski 2024-01-24 20:16:00 +01:00 committed by Greg Kroah-Hartman
parent c61f2bf870
commit 6ae1d209c6
1 changed files with 2 additions and 0 deletions
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2
net/core/filter.c
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@ -4081,6 +4081,8 @@ 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;
}