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xsk: Carry a copy of xdp_zc_max_segs within xsk_buff_pool

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This so we avoid dereferencing struct net_device within hot path.

Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Magnus Karlsson <magnus.karlsson@intel.com>
Link: https://lore.kernel.org/bpf/20241007122458.282590-5-maciej.fijalkowski@intel.com
This commit is contained in:
Maciej Fijalkowski 2024-10-07 14:24:56 +02:00 committed by Daniel Borkmann
parent bea14124ba
commit 6e12687219
3 changed files with 3 additions and 1 deletions
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1
include/net/xsk_buff_pool.h
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@ -76,6 +76,7 @@ struct xsk_buff_pool {
u32 chunk_size;
u32 chunk_shift;
u32 frame_len;
u32 xdp_zc_max_segs;
u8 tx_metadata_len; /* inherited from umem */
u8 cached_need_wakeup;
bool uses_need_wakeup;

1
net/xdp/xsk_buff_pool.c
View File

@ -229,6 +229,7 @@ int xp_assign_dev(struct xsk_buff_pool *pool,
goto err_unreg_xsk;
}
pool->umem->zc = true;
pool->xdp_zc_max_segs = netdev->xdp_zc_max_segs;
return 0;
err_unreg_xsk:

2
net/xdp/xsk_queue.h
View File

@ -260,7 +260,7 @@ u32 xskq_cons_read_desc_batch(struct xsk_queue *q, struct xsk_buff_pool *pool,
nr_frags = 0;
} else {
nr_frags++;
if (nr_frags == pool->netdev->xdp_zc_max_segs) {
if (nr_frags == pool->xdp_zc_max_segs) {
nr_frags = 0;
break;
}