forked from Minki/linux
9647c57b11
Test for dma_need_sync earlier to increase performance. xsk_buff_dma_sync_for_cpu() takes an xdp_buff as parameter and from that the xsk_buff_pool reference is dug out. Perf shows that this dereference causes a lot of cache misses. But as the buffer pool is now sent down to the driver at zero-copy initialization time, we might as well use this pointer directly, instead of going via the xsk_buff and we can do so already in xsk_buff_dma_sync_for_cpu() instead of in xp_dma_sync_for_cpu. This gets rid of these cache misses. Throughput increases with 3% for the xdpsock l2fwd sample application on my machine. Signed-off-by: Magnus Karlsson <magnus.karlsson@intel.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Björn Töpel <bjorn.topel@intel.com> Link: https://lore.kernel.org/bpf/1598603189-32145-11-git-send-email-magnus.karlsson@intel.com
241 lines
5.3 KiB
C
241 lines
5.3 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);
|
|
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 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 */
|