diff mbox series

[v6,bpf,09/11] xdp: reflect tail increase for MEM_TYPE_XSK_BUFF_POOL

Message ID 20240124191602.566724-10-maciej.fijalkowski@intel.com (mailing list archive)
State Accepted
Commit fbadd83a612c3b7aad2987893faca6bd24aaebb3
Delegated to: BPF
Headers show
Series net: bpf_xdp_adjust_tail() and Intel mbuf fixes | expand

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Commit Message

Fijalkowski, Maciej Jan. 24, 2024, 7:16 p.m. UTC 
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: 24ea50127ecf ("xsk: support mbuf on ZC RX")
Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
---
 net/core/filter.c | 2 ++
 1 file changed, 2 insertions(+)
diff mbox series

Patch

diff --git a/net/core/filter.c b/net/core/filter.c
index 99d5cc3aea46..4a912fba5c7e 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -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;
 }