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921b68692a
Enable the sharing of dma mappings by moving them out from the buffer pool. Instead we put each dma mapped umem region in a list in the umem structure. If dma has already been mapped for this umem and device, it is not mapped again and the existing dma mappings are reused. 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/1598603189-32145-9-git-send-email-magnus.karlsson@intel.com
123 lines
2.5 KiB
C
123 lines
2.5 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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struct xdp_buff;
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struct xdp_umem {
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void *addrs;
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u64 size;
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u32 headroom;
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u32 chunk_size;
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u32 chunks;
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struct user_struct *user;
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refcount_t users;
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struct page **pgs;
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u32 npgs;
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u8 flags;
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int id;
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bool zc;
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struct list_head xsk_dma_list;
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};
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struct xsk_map {
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struct bpf_map map;
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spinlock_t lock; /* Synchronize map updates */
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struct xdp_sock *xsk_map[];
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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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struct xsk_buff_pool *pool;
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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 tx_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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/* Statistics */
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u64 rx_dropped;
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u64 rx_queue_full;
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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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struct xsk_queue *fq_tmp; /* Only as tmp storage before bind */
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struct xsk_queue *cq_tmp; /* Only as tmp storage before bind */
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};
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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_map_redirect(struct xdp_sock *xs, struct xdp_buff *xdp);
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void __xsk_map_flush(void);
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static inline struct xdp_sock *__xsk_map_lookup_elem(struct bpf_map *map,
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u32 key)
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{
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struct xsk_map *m = container_of(map, struct xsk_map, map);
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struct xdp_sock *xs;
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if (key >= map->max_entries)
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return NULL;
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xs = READ_ONCE(m->xsk_map[key]);
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return xs;
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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_map_redirect(struct xdp_sock *xs, struct xdp_buff *xdp)
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{
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return -EOPNOTSUPP;
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}
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static inline void __xsk_map_flush(void)
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{
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}
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static inline struct xdp_sock *__xsk_map_lookup_elem(struct bpf_map *map,
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u32 key)
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{
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return NULL;
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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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