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99b29a499b
In the previous implementation, when multiple xsk sockets were associated with a single xsk_buff_pool, a situation could arise where the xsk_tx_list maintained data at the front for one xsk socket while starving the xsk sockets at the back of the list. This could result in issues such as the inability to transmit packets, increased latency, and jitter. To address this problem, we introduce a new variable called tx_budget_spent, which limits each xsk to transmit a maximum of MAX_PER_SOCKET_BUDGET tx descriptors. This allocation ensures equitable opportunities for subsequent xsk sockets to send tx descriptors. The value of MAX_PER_SOCKET_BUDGET is set to 32. Signed-off-by: Albert Huang <huangjie.albert@bytedance.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Magnus Karlsson <magnus.karlsson@intel.com> Link: https://lore.kernel.org/bpf/20231023125732.82261-1-huangjie.albert@bytedance.com
128 lines
2.8 KiB
C
128 lines
2.8 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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/* record the number of tx descriptors sent by this xsk and
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* when it exceeds MAX_PER_SOCKET_BUDGET, an opportunity needs
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* to be given to other xsks for sending tx descriptors, thereby
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* preventing other XSKs from being starved.
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*/
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u32 tx_budget_spent;
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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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#if defined(CONFIG_XDP_SOCKETS) && defined(CONFIG_DEBUG_NET)
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bool xsk_map_check_flush(void);
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#else
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static inline bool xsk_map_check_flush(void)
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{
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return false;
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}
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#endif
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#endif /* _LINUX_XDP_SOCK_H */
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