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xsk: Fix zero-copy AF_XDP fragment drop

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AF_XDP should ensure that only a complete packet is sent to application.
In the zero-copy case, if the Rx queue gets full as fragments are being
enqueued, the remaining fragments are dropped.

For the multi-buffer case, add a check to ensure that the Rx queue has
enough space for all fragments of a packet before starting to enqueue
them.

Fixes: 24ea50127e ("xsk: support mbuf on ZC RX")
Signed-off-by: Nikhil P. Rao <nikhil.rao@amd.com>
Link: https://patch.msgid.link/20260225000456.107806-3-nikhil.rao@amd.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Nikhil P. Rao 2026-02-25 00:00:27 +00:00 • committed by Jakub Kicinski
parent 60abb0ac11
commit f7387d6579
1 changed files with 16 additions and 10 deletions
Download patch file Download diff file Expand all files Collapse all files

20
net/xdp/xsk.c
View file

@ -167,25 +167,31 @@ static int xsk_rcv_zc(struct xdp_sock *xs, struct xdp_buff *xdp, u32 len)
struct xdp_buff_xsk *pos, *tmp;
struct list_head *xskb_list;
u32 contd = 0;
u32 num_desc;
int err;
if (frags)
contd = XDP_PKT_CONTD;
if (likely(!frags)) {
err = __xsk_rcv_zc(xs, xskb, len, contd);
if (err)
goto err;
if (likely(!frags))
return 0;
}
contd = XDP_PKT_CONTD;
num_desc = xdp_get_shared_info_from_buff(xdp)->nr_frags + 1;
if (xskq_prod_nb_free(xs->rx, num_desc) < num_desc) {
xs->rx_queue_full++;
err = -ENOBUFS;
goto err;
}
__xsk_rcv_zc(xs, xskb, len, contd);
xskb_list = &xskb->pool->xskb_list;
list_for_each_entry_safe(pos, tmp, xskb_list, list_node) {
if (list_is_singular(xskb_list))
contd = 0;
len = pos->xdp.data_end - pos->xdp.data;
err = __xsk_rcv_zc(xs, pos, len, contd);
if (err)
goto err;
__xsk_rcv_zc(xs, pos, len, contd);
list_del_init(&pos->list_node);
}