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