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xsk: add functions to fill control buffer

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Commit 94ecc5ca4d ("xsk: Add cb area to struct xdp_buff_xsk") has added
a buffer for custom data to xdp_buff_xsk. Particularly, this memory is used
for data, consumed by XDP hints kfuncs. It does not always change on
a per-packet basis and some parts can be set for example, at the same time
as RX queue info.

Add functions to fill all cbs in xsk_buff_pool with the same metadata.

Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
Acked-by: Magnus Karlsson <magnus.karlsson@intel.com>
Link: https://lore.kernel.org/r/20231205210847.28460-8-larysa.zaremba@intel.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Maciej Fijalkowski 2023-12-05 22:08:36 +01:00 committed by Alexei Starovoitov
parent 0e6a7b0959
commit b4e352ff11
3 changed files with 31 additions and 0 deletions
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17
include/net/xdp_sock_drv.h
View file

@ -14,6 +14,12 @@
#ifdef CONFIG_XDP_SOCKETS
struct xsk_cb_desc {
void *src;
u8 off;
u8 bytes;
};
void xsk_tx_completed(struct xsk_buff_pool *pool, u32 nb_entries);
bool xsk_tx_peek_desc(struct xsk_buff_pool *pool, struct xdp_desc *desc);
u32 xsk_tx_peek_release_desc_batch(struct xsk_buff_pool *pool, u32 max);
@ -47,6 +53,12 @@ static inline void xsk_pool_set_rxq_info(struct xsk_buff_pool *pool,
xp_set_rxq_info(pool, rxq);
}
static inline void xsk_pool_fill_cb(struct xsk_buff_pool *pool,
struct xsk_cb_desc *desc)
{
xp_fill_cb(pool, desc);
}
static inline unsigned int xsk_pool_get_napi_id(struct xsk_buff_pool *pool)
{
#ifdef CONFIG_NET_RX_BUSY_POLL
@ -274,6 +286,11 @@ static inline void xsk_pool_set_rxq_info(struct xsk_buff_pool *pool,
{
}
static inline void xsk_pool_fill_cb(struct xsk_buff_pool *pool,
struct xsk_cb_desc *desc)
{
}
static inline unsigned int xsk_pool_get_napi_id(struct xsk_buff_pool *pool)
{
return 0;

2
include/net/xsk_buff_pool.h
View file

@ -12,6 +12,7 @@
struct xsk_buff_pool;
struct xdp_rxq_info;
struct xsk_cb_desc;
struct xsk_queue;
struct xdp_desc;
struct xdp_umem;
@ -135,6 +136,7 @@ static inline void xp_init_xskb_dma(struct xdp_buff_xsk *xskb, struct xsk_buff_p
/* AF_XDP ZC drivers, via xdp_sock_buff.h */
void xp_set_rxq_info(struct xsk_buff_pool *pool, struct xdp_rxq_info *rxq);
void xp_fill_cb(struct xsk_buff_pool *pool, struct xsk_cb_desc *desc);
int xp_dma_map(struct xsk_buff_pool *pool, struct device *dev,
unsigned long attrs, struct page **pages, u32 nr_pages);
void xp_dma_unmap(struct xsk_buff_pool *pool, unsigned long attrs);

12
net/xdp/xsk_buff_pool.c
View file

@ -125,6 +125,18 @@ void xp_set_rxq_info(struct xsk_buff_pool *pool, struct xdp_rxq_info *rxq)
}
EXPORT_SYMBOL(xp_set_rxq_info);
void xp_fill_cb(struct xsk_buff_pool *pool, struct xsk_cb_desc *desc)
{
u32 i;
for (i = 0; i < pool->heads_cnt; i++) {
struct xdp_buff_xsk *xskb = &pool->heads[i];
memcpy(xskb->cb + desc->off, desc->src, desc->bytes);
}
}
EXPORT_SYMBOL(xp_fill_cb);
static void xp_disable_drv_zc(struct xsk_buff_pool *pool)
{
struct netdev_bpf bpf;