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Userspace applications indicate their multi-buffer capability to xsk
using XSK_USE_SG socket bind flag. For sockets using shared umem the
bind flag may contain XSK_USE_SG only for the first socket. For any
subsequent socket the only option supported is XDP_SHARED_UMEM.
Add option XDP_UMEM_SG_FLAG in umem config flags to store the
multi-buffer handling capability when indicated by XSK_USE_SG option in
bing flag by the first socket. Use this to derive multi-buffer capability
for subsequent sockets in xsk core.
Signed-off-by: Tirthendu Sarkar <tirthendu.sarkar@intel.com>
Fixes: 81470b5c3c ("xsk: introduce XSK_USE_SG bind flag for xsk socket")
Acked-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Link: https://lore.kernel.org/r/20230907035032.2627879-1-tirthendu.sarkar@intel.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
113 lines
2.4 KiB
C
113 lines
2.4 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/bpf.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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#define XDP_UMEM_SG_FLAG (1 << 1)
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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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u32 npgs;
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struct user_struct *user;
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refcount_t users;
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u8 flags;
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bool zc;
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struct page **pgs;
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int id;
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struct list_head xsk_dma_list;
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struct work_struct work;
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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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atomic_t count;
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struct xdp_sock __rcu *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 ____cacheline_aligned_in_smp;
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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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bool sg;
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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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struct xsk_queue *tx ____cacheline_aligned_in_smp;
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struct list_head tx_list;
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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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/* When __xsk_generic_xmit() must return before it sees the EOP descriptor for the current
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* packet, the partially built skb is saved here so that packet building can resume in next
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* call of __xsk_generic_xmit().
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*/
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struct sk_buff *skb;
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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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/* Protects multiple processes in the control path */
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struct mutex mutex;
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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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#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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#endif /* CONFIG_XDP_SOCKETS */
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#endif /* _LINUX_XDP_SOCK_H */
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