diff options
Diffstat (limited to 'net/xdp/xsk.c')
| -rw-r--r-- | net/xdp/xsk.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c index ba070fd37d24..ae9f8cb611f6 100644 --- a/net/xdp/xsk.c +++ b/net/xdp/xsk.c @@ -33,6 +33,7 @@ #include "xsk.h" #define TX_BATCH_SIZE 32 +#define MAX_PER_SOCKET_BUDGET (TX_BATCH_SIZE) static DEFINE_PER_CPU(struct list_head, xskmap_flush_list); @@ -423,16 +424,25 @@ EXPORT_SYMBOL(xsk_tx_release); bool xsk_tx_peek_desc(struct xsk_buff_pool *pool, struct xdp_desc *desc) { + bool budget_exhausted = false; struct xdp_sock *xs; rcu_read_lock(); +again: list_for_each_entry_rcu(xs, &pool->xsk_tx_list, tx_list) { + if (xs->tx_budget_spent >= MAX_PER_SOCKET_BUDGET) { + budget_exhausted = true; + continue; + } + if (!xskq_cons_peek_desc(xs->tx, desc, pool)) { if (xskq_has_descs(xs->tx)) xskq_cons_release(xs->tx); continue; } + xs->tx_budget_spent++; + /* This is the backpressure mechanism for the Tx path. * Reserve space in the completion queue and only proceed * if there is space in it. This avoids having to implement @@ -446,6 +456,14 @@ bool xsk_tx_peek_desc(struct xsk_buff_pool *pool, struct xdp_desc *desc) return true; } + if (budget_exhausted) { + list_for_each_entry_rcu(xs, &pool->xsk_tx_list, tx_list) + xs->tx_budget_spent = 0; + + budget_exhausted = false; + goto again; + } + out: rcu_read_unlock(); return false; |