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xsk: Fix offset calculation in unaligned mode

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Bring back previous offset calculation behaviour
in AF_XDP unaligned umem mode.

In unaligned mode, upper 16 bits should contain
data offset, lower 48 bits should contain
only specific chunk location without offset.

Remove pool->headroom duplication into 48bit address.

Signed-off-by: Eryk Kubanski <e.kubanski@partner.samsung.com>
Fixes: bea14124ba ("xsk: Get rid of xdp_buff_xsk::orig_addr")
Acked-by: Magnus Karlsson <magnus.karlsson@intel.com>
Link: https://patch.msgid.link/20250416112925.7501-1-e.kubanski@partner.samsung.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
e.kubanski
2025-04-16 13:29:25 +02:00
committed by Jakub Kicinski
parent a1356ac774
commit bf20af0790
1 changed files with 1 additions and 1 deletions
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2
include/net/xsk_buff_pool.h
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@@ -240,8 +240,8 @@ static inline u64 xp_get_handle(struct xdp_buff_xsk *xskb,
return orig_addr;
offset = xskb->xdp.data - xskb->xdp.data_hard_start;
orig_addr -= offset;
offset += pool->headroom;
orig_addr -= offset;
return orig_addr + (offset << XSK_UNALIGNED_BUF_OFFSET_SHIFT);
}