230 lines
6.5 KiB
C
230 lines
6.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/* Copyright(c) 2020 Intel Corporation. */
|
|
|
|
#ifndef XSK_BUFF_POOL_H_
|
|
#define XSK_BUFF_POOL_H_
|
|
|
|
#include <linux/if_xdp.h>
|
|
#include <linux/types.h>
|
|
#include <linux/dma-mapping.h>
|
|
#include <linux/bpf.h>
|
|
#include <net/xdp.h>
|
|
|
|
struct xsk_buff_pool;
|
|
struct xdp_rxq_info;
|
|
struct xsk_queue;
|
|
struct xdp_desc;
|
|
struct xdp_umem;
|
|
struct xdp_sock;
|
|
struct device;
|
|
struct page;
|
|
|
|
#define XSK_PRIV_MAX 24
|
|
|
|
struct xdp_buff_xsk {
|
|
struct xdp_buff xdp;
|
|
u8 cb[XSK_PRIV_MAX];
|
|
dma_addr_t dma;
|
|
dma_addr_t frame_dma;
|
|
struct xsk_buff_pool *pool;
|
|
u64 orig_addr;
|
|
struct list_head free_list_node;
|
|
};
|
|
|
|
#define XSK_CHECK_PRIV_TYPE(t) BUILD_BUG_ON(sizeof(t) > offsetofend(struct xdp_buff_xsk, cb))
|
|
|
|
struct xsk_dma_map {
|
|
dma_addr_t *dma_pages;
|
|
struct device *dev;
|
|
struct net_device *netdev;
|
|
refcount_t users;
|
|
struct list_head list; /* Protected by the RTNL_LOCK */
|
|
u32 dma_pages_cnt;
|
|
bool dma_need_sync;
|
|
};
|
|
|
|
struct xsk_buff_pool {
|
|
/* Members only used in the control path first. */
|
|
struct device *dev;
|
|
struct net_device *netdev;
|
|
struct list_head xsk_tx_list;
|
|
/* Protects modifications to the xsk_tx_list */
|
|
spinlock_t xsk_tx_list_lock;
|
|
refcount_t users;
|
|
struct xdp_umem *umem;
|
|
struct work_struct work;
|
|
struct list_head free_list;
|
|
u32 heads_cnt;
|
|
u16 queue_id;
|
|
|
|
/* Data path members as close to free_heads at the end as possible. */
|
|
struct xsk_queue *fq ____cacheline_aligned_in_smp;
|
|
struct xsk_queue *cq;
|
|
/* For performance reasons, each buff pool has its own array of dma_pages
|
|
* even when they are identical.
|
|
*/
|
|
dma_addr_t *dma_pages;
|
|
struct xdp_buff_xsk *heads;
|
|
struct xdp_desc *tx_descs;
|
|
u64 chunk_mask;
|
|
u64 addrs_cnt;
|
|
u32 free_list_cnt;
|
|
u32 dma_pages_cnt;
|
|
u32 free_heads_cnt;
|
|
u32 headroom;
|
|
u32 chunk_size;
|
|
u32 chunk_shift;
|
|
u32 frame_len;
|
|
u8 cached_need_wakeup;
|
|
bool uses_need_wakeup;
|
|
bool dma_need_sync;
|
|
bool unaligned;
|
|
void *addrs;
|
|
/* Mutual exclusion of the completion ring in the SKB mode. Two cases to protect:
|
|
* NAPI TX thread and sendmsg error paths in the SKB destructor callback and when
|
|
* sockets share a single cq when the same netdev and queue id is shared.
|
|
*/
|
|
spinlock_t cq_lock;
|
|
struct xdp_buff_xsk *free_heads[];
|
|
};
|
|
|
|
/* Masks for xdp_umem_page flags.
|
|
* The low 12-bits of the addr will be 0 since this is the page address, so we
|
|
* can use them for flags.
|
|
*/
|
|
#define XSK_NEXT_PG_CONTIG_SHIFT 0
|
|
#define XSK_NEXT_PG_CONTIG_MASK BIT_ULL(XSK_NEXT_PG_CONTIG_SHIFT)
|
|
|
|
/* AF_XDP core. */
|
|
struct xsk_buff_pool *xp_create_and_assign_umem(struct xdp_sock *xs,
|
|
struct xdp_umem *umem);
|
|
int xp_assign_dev(struct xsk_buff_pool *pool, struct net_device *dev,
|
|
u16 queue_id, u16 flags);
|
|
int xp_assign_dev_shared(struct xsk_buff_pool *pool, struct xdp_sock *umem_xs,
|
|
struct net_device *dev, u16 queue_id);
|
|
int xp_alloc_tx_descs(struct xsk_buff_pool *pool, struct xdp_sock *xs);
|
|
void xp_destroy(struct xsk_buff_pool *pool);
|
|
void xp_get_pool(struct xsk_buff_pool *pool);
|
|
bool xp_put_pool(struct xsk_buff_pool *pool);
|
|
void xp_clear_dev(struct xsk_buff_pool *pool);
|
|
void xp_add_xsk(struct xsk_buff_pool *pool, struct xdp_sock *xs);
|
|
void xp_del_xsk(struct xsk_buff_pool *pool, struct xdp_sock *xs);
|
|
|
|
/* AF_XDP, and XDP core. */
|
|
void xp_free(struct xdp_buff_xsk *xskb);
|
|
|
|
static inline void xp_init_xskb_addr(struct xdp_buff_xsk *xskb, struct xsk_buff_pool *pool,
|
|
u64 addr)
|
|
{
|
|
xskb->orig_addr = addr;
|
|
xskb->xdp.data_hard_start = pool->addrs + addr + pool->headroom;
|
|
}
|
|
|
|
static inline void xp_init_xskb_dma(struct xdp_buff_xsk *xskb, struct xsk_buff_pool *pool,
|
|
dma_addr_t *dma_pages, u64 addr)
|
|
{
|
|
xskb->frame_dma = (dma_pages[addr >> PAGE_SHIFT] & ~XSK_NEXT_PG_CONTIG_MASK) +
|
|
(addr & ~PAGE_MASK);
|
|
xskb->dma = xskb->frame_dma + pool->headroom + XDP_PACKET_HEADROOM;
|
|
}
|
|
|
|
/* AF_XDP ZC drivers, via xdp_sock_buff.h */
|
|
void xp_set_rxq_info(struct xsk_buff_pool *pool, struct xdp_rxq_info *rxq);
|
|
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);
|
|
struct xdp_buff *xp_alloc(struct xsk_buff_pool *pool);
|
|
u32 xp_alloc_batch(struct xsk_buff_pool *pool, struct xdp_buff **xdp, u32 max);
|
|
bool xp_can_alloc(struct xsk_buff_pool *pool, u32 count);
|
|
void *xp_raw_get_data(struct xsk_buff_pool *pool, u64 addr);
|
|
dma_addr_t xp_raw_get_dma(struct xsk_buff_pool *pool, u64 addr);
|
|
static inline dma_addr_t xp_get_dma(struct xdp_buff_xsk *xskb)
|
|
{
|
|
return xskb->dma;
|
|
}
|
|
|
|
static inline dma_addr_t xp_get_frame_dma(struct xdp_buff_xsk *xskb)
|
|
{
|
|
return xskb->frame_dma;
|
|
}
|
|
|
|
void xp_dma_sync_for_cpu_slow(struct xdp_buff_xsk *xskb);
|
|
static inline void xp_dma_sync_for_cpu(struct xdp_buff_xsk *xskb)
|
|
{
|
|
xp_dma_sync_for_cpu_slow(xskb);
|
|
}
|
|
|
|
void xp_dma_sync_for_device_slow(struct xsk_buff_pool *pool, dma_addr_t dma,
|
|
size_t size);
|
|
static inline void xp_dma_sync_for_device(struct xsk_buff_pool *pool,
|
|
dma_addr_t dma, size_t size)
|
|
{
|
|
if (!pool->dma_need_sync)
|
|
return;
|
|
|
|
xp_dma_sync_for_device_slow(pool, dma, size);
|
|
}
|
|
|
|
/* Masks for xdp_umem_page flags.
|
|
* The low 12-bits of the addr will be 0 since this is the page address, so we
|
|
* can use them for flags.
|
|
*/
|
|
#define XSK_NEXT_PG_CONTIG_SHIFT 0
|
|
#define XSK_NEXT_PG_CONTIG_MASK BIT_ULL(XSK_NEXT_PG_CONTIG_SHIFT)
|
|
|
|
static inline bool xp_desc_crosses_non_contig_pg(struct xsk_buff_pool *pool,
|
|
u64 addr, u32 len)
|
|
{
|
|
bool cross_pg = (addr & (PAGE_SIZE - 1)) + len > PAGE_SIZE;
|
|
|
|
if (likely(!cross_pg))
|
|
return false;
|
|
|
|
return pool->dma_pages_cnt &&
|
|
!(pool->dma_pages[addr >> PAGE_SHIFT] & XSK_NEXT_PG_CONTIG_MASK);
|
|
}
|
|
|
|
static inline u64 xp_aligned_extract_addr(struct xsk_buff_pool *pool, u64 addr)
|
|
{
|
|
return addr & pool->chunk_mask;
|
|
}
|
|
|
|
static inline u64 xp_unaligned_extract_addr(u64 addr)
|
|
{
|
|
return addr & XSK_UNALIGNED_BUF_ADDR_MASK;
|
|
}
|
|
|
|
static inline u64 xp_unaligned_extract_offset(u64 addr)
|
|
{
|
|
return addr >> XSK_UNALIGNED_BUF_OFFSET_SHIFT;
|
|
}
|
|
|
|
static inline u64 xp_unaligned_add_offset_to_addr(u64 addr)
|
|
{
|
|
return xp_unaligned_extract_addr(addr) +
|
|
xp_unaligned_extract_offset(addr);
|
|
}
|
|
|
|
static inline u32 xp_aligned_extract_idx(struct xsk_buff_pool *pool, u64 addr)
|
|
{
|
|
return xp_aligned_extract_addr(pool, addr) >> pool->chunk_shift;
|
|
}
|
|
|
|
static inline void xp_release(struct xdp_buff_xsk *xskb)
|
|
{
|
|
if (xskb->pool->unaligned)
|
|
xskb->pool->free_heads[xskb->pool->free_heads_cnt++] = xskb;
|
|
}
|
|
|
|
static inline u64 xp_get_handle(struct xdp_buff_xsk *xskb)
|
|
{
|
|
u64 offset = xskb->xdp.data - xskb->xdp.data_hard_start;
|
|
|
|
offset += xskb->pool->headroom;
|
|
if (!xskb->pool->unaligned)
|
|
return xskb->orig_addr + offset;
|
|
return xskb->orig_addr + (offset << XSK_UNALIGNED_BUF_OFFSET_SHIFT);
|
|
}
|
|
|
|
#endif /* XSK_BUFF_POOL_H_ */
|