From d57d76428ae9abca51fb89f9326da9d4b1cf8270 Mon Sep 17 00:00:00 2001 From: Maxim Mikityanskiy Date: Wed, 26 Jun 2019 17:35:24 +0300 Subject: xsk: Add API to check for available entries in FQ MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Add a function that checks whether the Fill Ring has the specified amount of descriptors available. It will be useful for mlx5e that wants to check in advance, whether it can allocate a bulk of RX descriptors, to get the best performance. Signed-off-by: Maxim Mikityanskiy Signed-off-by: Tariq Toukan Acked-by: Saeed Mahameed Acked-by: Björn Töpel Signed-off-by: Daniel Borkmann --- net/xdp/xsk.c | 6 ++++++ net/xdp/xsk_queue.h | 14 ++++++++++++++ 2 files changed, 20 insertions(+) (limited to 'net/xdp') diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c index a14e8864e4fa..b68a380f50b3 100644 --- a/net/xdp/xsk.c +++ b/net/xdp/xsk.c @@ -37,6 +37,12 @@ bool xsk_is_setup_for_bpf_map(struct xdp_sock *xs) READ_ONCE(xs->umem->fq); } +bool xsk_umem_has_addrs(struct xdp_umem *umem, u32 cnt) +{ + return xskq_has_addrs(umem->fq, cnt); +} +EXPORT_SYMBOL(xsk_umem_has_addrs); + u64 *xsk_umem_peek_addr(struct xdp_umem *umem, u64 *addr) { return xskq_peek_addr(umem->fq, addr); diff --git a/net/xdp/xsk_queue.h b/net/xdp/xsk_queue.h index 88b9ae24658d..12b49784a6d5 100644 --- a/net/xdp/xsk_queue.h +++ b/net/xdp/xsk_queue.h @@ -117,6 +117,20 @@ static inline u32 xskq_nb_free(struct xsk_queue *q, u32 producer, u32 dcnt) return q->nentries - (producer - q->cons_tail); } +static inline bool xskq_has_addrs(struct xsk_queue *q, u32 cnt) +{ + u32 entries = q->prod_tail - q->cons_tail; + + if (entries >= cnt) + return true; + + /* Refresh the local pointer. */ + q->prod_tail = READ_ONCE(q->ring->producer); + entries = q->prod_tail - q->cons_tail; + + return entries >= cnt; +} + /* UMEM queue */ static inline bool xskq_is_valid_addr(struct xsk_queue *q, u64 addr) -- cgit