363 lines
8.3 KiB
C
363 lines
8.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/* AF_XDP internal functions
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* Copyright(c) 2018 Intel Corporation.
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*/
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#ifndef _LINUX_XDP_SOCK_H
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#define _LINUX_XDP_SOCK_H
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#include <linux/workqueue.h>
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#include <linux/if_xdp.h>
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#include <linux/mutex.h>
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#include <linux/spinlock.h>
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#include <linux/mm.h>
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#include <net/sock.h>
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struct net_device;
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struct xsk_queue;
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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 (1ULL << XSK_NEXT_PG_CONTIG_SHIFT)
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struct xdp_umem_page {
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void *addr;
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dma_addr_t dma;
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};
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struct xdp_umem_fq_reuse {
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u32 nentries;
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u32 length;
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u64 handles[];
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};
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/* Flags for the umem flags field.
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*
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* The NEED_WAKEUP flag is 1 due to the reuse of the flags field for public
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* flags. See inlude/uapi/include/linux/if_xdp.h.
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*/
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#define XDP_UMEM_USES_NEED_WAKEUP (1 << 1)
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struct xdp_umem {
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struct xsk_queue *fq;
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struct xsk_queue *cq;
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struct xdp_umem_page *pages;
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u64 chunk_mask;
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u64 size;
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u32 headroom;
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u32 chunk_size_nohr;
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struct user_struct *user;
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unsigned long address;
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refcount_t users;
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struct work_struct work;
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struct page **pgs;
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u32 npgs;
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u16 queue_id;
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u8 need_wakeup;
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u8 flags;
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int id;
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struct net_device *dev;
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struct xdp_umem_fq_reuse *fq_reuse;
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bool zc;
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spinlock_t xsk_list_lock;
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struct list_head xsk_list;
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};
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/* Nodes are linked in the struct xdp_sock map_list field, and used to
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* track which maps a certain socket reside in.
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*/
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struct xsk_map;
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struct xsk_map_node {
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struct list_head node;
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struct xsk_map *map;
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struct xdp_sock **map_entry;
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};
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struct xdp_sock {
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/* struct sock must be the first member of struct xdp_sock */
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struct sock sk;
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struct xsk_queue *rx;
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struct net_device *dev;
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struct xdp_umem *umem;
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struct list_head flush_node;
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u16 queue_id;
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bool zc;
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enum {
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XSK_READY = 0,
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XSK_BOUND,
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XSK_UNBOUND,
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} state;
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/* Protects multiple processes in the control path */
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struct mutex mutex;
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struct xsk_queue *tx ____cacheline_aligned_in_smp;
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struct list_head list;
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/* Mutual exclusion of NAPI TX thread and sendmsg error paths
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* in the SKB destructor callback.
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*/
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spinlock_t tx_completion_lock;
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/* Protects generic receive. */
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spinlock_t rx_lock;
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u64 rx_dropped;
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struct list_head map_list;
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/* Protects map_list */
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spinlock_t map_list_lock;
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};
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struct xdp_buff;
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#ifdef CONFIG_XDP_SOCKETS
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int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp);
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int xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp);
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void xsk_flush(struct xdp_sock *xs);
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bool xsk_is_setup_for_bpf_map(struct xdp_sock *xs);
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/* Used from netdev driver */
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bool xsk_umem_has_addrs(struct xdp_umem *umem, u32 cnt);
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u64 *xsk_umem_peek_addr(struct xdp_umem *umem, u64 *addr);
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void xsk_umem_discard_addr(struct xdp_umem *umem);
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void xsk_umem_complete_tx(struct xdp_umem *umem, u32 nb_entries);
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bool xsk_umem_consume_tx(struct xdp_umem *umem, struct xdp_desc *desc);
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void xsk_umem_consume_tx_done(struct xdp_umem *umem);
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struct xdp_umem_fq_reuse *xsk_reuseq_prepare(u32 nentries);
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struct xdp_umem_fq_reuse *xsk_reuseq_swap(struct xdp_umem *umem,
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struct xdp_umem_fq_reuse *newq);
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void xsk_reuseq_free(struct xdp_umem_fq_reuse *rq);
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struct xdp_umem *xdp_get_umem_from_qid(struct net_device *dev, u16 queue_id);
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void xsk_set_rx_need_wakeup(struct xdp_umem *umem);
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void xsk_set_tx_need_wakeup(struct xdp_umem *umem);
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void xsk_clear_rx_need_wakeup(struct xdp_umem *umem);
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void xsk_clear_tx_need_wakeup(struct xdp_umem *umem);
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bool xsk_umem_uses_need_wakeup(struct xdp_umem *umem);
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void xsk_map_try_sock_delete(struct xsk_map *map, struct xdp_sock *xs,
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struct xdp_sock **map_entry);
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int xsk_map_inc(struct xsk_map *map);
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void xsk_map_put(struct xsk_map *map);
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static inline u64 xsk_umem_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 xsk_umem_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 xsk_umem_add_offset_to_addr(u64 addr)
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{
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return xsk_umem_extract_addr(addr) + xsk_umem_extract_offset(addr);
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}
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static inline char *xdp_umem_get_data(struct xdp_umem *umem, u64 addr)
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{
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unsigned long page_addr;
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addr = xsk_umem_add_offset_to_addr(addr);
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page_addr = (unsigned long)umem->pages[addr >> PAGE_SHIFT].addr;
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return (char *)(page_addr & PAGE_MASK) + (addr & ~PAGE_MASK);
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}
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static inline dma_addr_t xdp_umem_get_dma(struct xdp_umem *umem, u64 addr)
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{
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addr = xsk_umem_add_offset_to_addr(addr);
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return umem->pages[addr >> PAGE_SHIFT].dma + (addr & ~PAGE_MASK);
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}
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/* Reuse-queue aware version of FILL queue helpers */
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static inline bool xsk_umem_has_addrs_rq(struct xdp_umem *umem, u32 cnt)
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{
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struct xdp_umem_fq_reuse *rq = umem->fq_reuse;
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if (rq->length >= cnt)
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return true;
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return xsk_umem_has_addrs(umem, cnt - rq->length);
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}
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static inline u64 *xsk_umem_peek_addr_rq(struct xdp_umem *umem, u64 *addr)
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{
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struct xdp_umem_fq_reuse *rq = umem->fq_reuse;
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if (!rq->length)
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return xsk_umem_peek_addr(umem, addr);
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*addr = rq->handles[rq->length - 1];
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return addr;
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}
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static inline void xsk_umem_discard_addr_rq(struct xdp_umem *umem)
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{
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struct xdp_umem_fq_reuse *rq = umem->fq_reuse;
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if (!rq->length)
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xsk_umem_discard_addr(umem);
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else
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rq->length--;
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}
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static inline void xsk_umem_fq_reuse(struct xdp_umem *umem, u64 addr)
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{
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struct xdp_umem_fq_reuse *rq = umem->fq_reuse;
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rq->handles[rq->length++] = addr;
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}
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/* Handle the offset appropriately depending on aligned or unaligned mode.
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* For unaligned mode, we store the offset in the upper 16-bits of the address.
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* For aligned mode, we simply add the offset to the address.
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*/
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static inline u64 xsk_umem_adjust_offset(struct xdp_umem *umem, u64 address,
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u64 offset)
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{
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if (umem->flags & XDP_UMEM_UNALIGNED_CHUNK_FLAG)
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return address + (offset << XSK_UNALIGNED_BUF_OFFSET_SHIFT);
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else
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return address + offset;
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}
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#else
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static inline int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp)
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{
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return -ENOTSUPP;
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}
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static inline int xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp)
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{
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return -ENOTSUPP;
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}
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static inline void xsk_flush(struct xdp_sock *xs)
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{
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}
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static inline bool xsk_is_setup_for_bpf_map(struct xdp_sock *xs)
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{
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return false;
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}
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static inline bool xsk_umem_has_addrs(struct xdp_umem *umem, u32 cnt)
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{
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return false;
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}
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static inline u64 *xsk_umem_peek_addr(struct xdp_umem *umem, u64 *addr)
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{
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return NULL;
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}
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static inline void xsk_umem_discard_addr(struct xdp_umem *umem)
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{
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}
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static inline void xsk_umem_complete_tx(struct xdp_umem *umem, u32 nb_entries)
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{
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}
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static inline bool xsk_umem_consume_tx(struct xdp_umem *umem,
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struct xdp_desc *desc)
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{
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return false;
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}
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static inline void xsk_umem_consume_tx_done(struct xdp_umem *umem)
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{
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}
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static inline struct xdp_umem_fq_reuse *xsk_reuseq_prepare(u32 nentries)
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{
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return NULL;
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}
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static inline struct xdp_umem_fq_reuse *xsk_reuseq_swap(
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struct xdp_umem *umem,
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struct xdp_umem_fq_reuse *newq)
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{
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return NULL;
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}
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static inline void xsk_reuseq_free(struct xdp_umem_fq_reuse *rq)
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{
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}
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static inline struct xdp_umem *xdp_get_umem_from_qid(struct net_device *dev,
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u16 queue_id)
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{
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return NULL;
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}
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static inline u64 xsk_umem_extract_addr(u64 addr)
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{
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return 0;
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}
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static inline u64 xsk_umem_extract_offset(u64 addr)
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{
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return 0;
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}
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static inline u64 xsk_umem_add_offset_to_addr(u64 addr)
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{
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return 0;
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}
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static inline char *xdp_umem_get_data(struct xdp_umem *umem, u64 addr)
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{
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return NULL;
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}
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static inline dma_addr_t xdp_umem_get_dma(struct xdp_umem *umem, u64 addr)
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{
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return 0;
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}
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static inline bool xsk_umem_has_addrs_rq(struct xdp_umem *umem, u32 cnt)
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{
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return false;
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}
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static inline u64 *xsk_umem_peek_addr_rq(struct xdp_umem *umem, u64 *addr)
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{
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return NULL;
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}
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static inline void xsk_umem_discard_addr_rq(struct xdp_umem *umem)
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{
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}
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static inline void xsk_umem_fq_reuse(struct xdp_umem *umem, u64 addr)
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{
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}
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static inline void xsk_set_rx_need_wakeup(struct xdp_umem *umem)
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{
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}
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static inline void xsk_set_tx_need_wakeup(struct xdp_umem *umem)
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{
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}
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static inline void xsk_clear_rx_need_wakeup(struct xdp_umem *umem)
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{
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}
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static inline void xsk_clear_tx_need_wakeup(struct xdp_umem *umem)
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{
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}
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static inline bool xsk_umem_uses_need_wakeup(struct xdp_umem *umem)
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{
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return false;
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}
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static inline u64 xsk_umem_adjust_offset(struct xdp_umem *umem, u64 handle,
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u64 offset)
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{
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return 0;
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}
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#endif /* CONFIG_XDP_SOCKETS */
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#endif /* _LINUX_XDP_SOCK_H */
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