linux-stable/include/net/xdp_sock_drv.h
Magnus Karlsson 9349eb3a9d xsk: Introduce batched Tx descriptor interfaces
Introduce batched descriptor interfaces in the xsk core code for the
Tx path to be used in the driver to write a code path with higher
performance. This interface will be used by the i40e driver in the
next patch. Though other drivers would likely benefit from this new
interface too.

Note that batching is only implemented for the common case when
there is only one socket bound to the same device and queue id. When
this is not the case, we fall back to the old non-batched version of
the function.

Signed-off-by: Magnus Karlsson <magnus.karlsson@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/1605525167-14450-5-git-send-email-magnus.karlsson@gmail.com
2020-11-17 22:07:40 +01:00

247 lines
5.5 KiB
C

/* SPDX-License-Identifier: GPL-2.0 */
/* Interface for implementing AF_XDP zero-copy support in drivers.
* Copyright(c) 2020 Intel Corporation.
*/
#ifndef _LINUX_XDP_SOCK_DRV_H
#define _LINUX_XDP_SOCK_DRV_H
#include <net/xdp_sock.h>
#include <net/xsk_buff_pool.h>
#ifdef CONFIG_XDP_SOCKETS
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, struct xdp_desc *desc, u32 max);
void xsk_tx_release(struct xsk_buff_pool *pool);
struct xsk_buff_pool *xsk_get_pool_from_qid(struct net_device *dev,
u16 queue_id);
void xsk_set_rx_need_wakeup(struct xsk_buff_pool *pool);
void xsk_set_tx_need_wakeup(struct xsk_buff_pool *pool);
void xsk_clear_rx_need_wakeup(struct xsk_buff_pool *pool);
void xsk_clear_tx_need_wakeup(struct xsk_buff_pool *pool);
bool xsk_uses_need_wakeup(struct xsk_buff_pool *pool);
static inline u32 xsk_pool_get_headroom(struct xsk_buff_pool *pool)
{
return XDP_PACKET_HEADROOM + pool->headroom;
}
static inline u32 xsk_pool_get_chunk_size(struct xsk_buff_pool *pool)
{
return pool->chunk_size;
}
static inline u32 xsk_pool_get_rx_frame_size(struct xsk_buff_pool *pool)
{
return xsk_pool_get_chunk_size(pool) - xsk_pool_get_headroom(pool);
}
static inline void xsk_pool_set_rxq_info(struct xsk_buff_pool *pool,
struct xdp_rxq_info *rxq)
{
xp_set_rxq_info(pool, rxq);
}
static inline void xsk_pool_dma_unmap(struct xsk_buff_pool *pool,
unsigned long attrs)
{
xp_dma_unmap(pool, attrs);
}
static inline int xsk_pool_dma_map(struct xsk_buff_pool *pool,
struct device *dev, unsigned long attrs)
{
struct xdp_umem *umem = pool->umem;
return xp_dma_map(pool, dev, attrs, umem->pgs, umem->npgs);
}
static inline dma_addr_t xsk_buff_xdp_get_dma(struct xdp_buff *xdp)
{
struct xdp_buff_xsk *xskb = container_of(xdp, struct xdp_buff_xsk, xdp);
return xp_get_dma(xskb);
}
static inline dma_addr_t xsk_buff_xdp_get_frame_dma(struct xdp_buff *xdp)
{
struct xdp_buff_xsk *xskb = container_of(xdp, struct xdp_buff_xsk, xdp);
return xp_get_frame_dma(xskb);
}
static inline struct xdp_buff *xsk_buff_alloc(struct xsk_buff_pool *pool)
{
return xp_alloc(pool);
}
static inline bool xsk_buff_can_alloc(struct xsk_buff_pool *pool, u32 count)
{
return xp_can_alloc(pool, count);
}
static inline void xsk_buff_free(struct xdp_buff *xdp)
{
struct xdp_buff_xsk *xskb = container_of(xdp, struct xdp_buff_xsk, xdp);
xp_free(xskb);
}
static inline dma_addr_t xsk_buff_raw_get_dma(struct xsk_buff_pool *pool,
u64 addr)
{
return xp_raw_get_dma(pool, addr);
}
static inline void *xsk_buff_raw_get_data(struct xsk_buff_pool *pool, u64 addr)
{
return xp_raw_get_data(pool, addr);
}
static inline void xsk_buff_dma_sync_for_cpu(struct xdp_buff *xdp, struct xsk_buff_pool *pool)
{
struct xdp_buff_xsk *xskb = container_of(xdp, struct xdp_buff_xsk, xdp);
if (!pool->dma_need_sync)
return;
xp_dma_sync_for_cpu(xskb);
}
static inline void xsk_buff_raw_dma_sync_for_device(struct xsk_buff_pool *pool,
dma_addr_t dma,
size_t size)
{
xp_dma_sync_for_device(pool, dma, size);
}
#else
static inline void xsk_tx_completed(struct xsk_buff_pool *pool, u32 nb_entries)
{
}
static inline bool xsk_tx_peek_desc(struct xsk_buff_pool *pool,
struct xdp_desc *desc)
{
return false;
}
static inline u32 xsk_tx_peek_release_desc_batch(struct xsk_buff_pool *pool, struct xdp_desc *desc,
u32 max)
{
return 0;
}
static inline void xsk_tx_release(struct xsk_buff_pool *pool)
{
}
static inline struct xsk_buff_pool *
xsk_get_pool_from_qid(struct net_device *dev, u16 queue_id)
{
return NULL;
}
static inline void xsk_set_rx_need_wakeup(struct xsk_buff_pool *pool)
{
}
static inline void xsk_set_tx_need_wakeup(struct xsk_buff_pool *pool)
{
}
static inline void xsk_clear_rx_need_wakeup(struct xsk_buff_pool *pool)
{
}
static inline void xsk_clear_tx_need_wakeup(struct xsk_buff_pool *pool)
{
}
static inline bool xsk_uses_need_wakeup(struct xsk_buff_pool *pool)
{
return false;
}
static inline u32 xsk_pool_get_headroom(struct xsk_buff_pool *pool)
{
return 0;
}
static inline u32 xsk_pool_get_chunk_size(struct xsk_buff_pool *pool)
{
return 0;
}
static inline u32 xsk_pool_get_rx_frame_size(struct xsk_buff_pool *pool)
{
return 0;
}
static inline void xsk_pool_set_rxq_info(struct xsk_buff_pool *pool,
struct xdp_rxq_info *rxq)
{
}
static inline void xsk_pool_dma_unmap(struct xsk_buff_pool *pool,
unsigned long attrs)
{
}
static inline int xsk_pool_dma_map(struct xsk_buff_pool *pool,
struct device *dev, unsigned long attrs)
{
return 0;
}
static inline dma_addr_t xsk_buff_xdp_get_dma(struct xdp_buff *xdp)
{
return 0;
}
static inline dma_addr_t xsk_buff_xdp_get_frame_dma(struct xdp_buff *xdp)
{
return 0;
}
static inline struct xdp_buff *xsk_buff_alloc(struct xsk_buff_pool *pool)
{
return NULL;
}
static inline bool xsk_buff_can_alloc(struct xsk_buff_pool *pool, u32 count)
{
return false;
}
static inline void xsk_buff_free(struct xdp_buff *xdp)
{
}
static inline dma_addr_t xsk_buff_raw_get_dma(struct xsk_buff_pool *pool,
u64 addr)
{
return 0;
}
static inline void *xsk_buff_raw_get_data(struct xsk_buff_pool *pool, u64 addr)
{
return NULL;
}
static inline void xsk_buff_dma_sync_for_cpu(struct xdp_buff *xdp, struct xsk_buff_pool *pool)
{
}
static inline void xsk_buff_raw_dma_sync_for_device(struct xsk_buff_pool *pool,
dma_addr_t dma,
size_t size)
{
}
#endif /* CONFIG_XDP_SOCKETS */
#endif /* _LINUX_XDP_SOCK_DRV_H */