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authorMaxim Mikityanskiy <maximmi@mellanox.com>2019-06-26 17:35:24 +0300
committerDaniel Borkmann <daniel@iogearbox.net>2019-06-27 22:53:26 +0200
commitd57d76428ae9abca51fb89f9326da9d4b1cf8270 (patch)
tree4beba613d02a1578704d6b7eea7633648e5d7b59 /net/xdp
parente18953240de8b46360a67090c87ee1ef8160b35d (diff)
downloadlinux-d57d76428ae9abca51fb89f9326da9d4b1cf8270.tar.bz2
xsk: Add API to check for available entries in FQ
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 <maximmi@mellanox.com> Signed-off-by: Tariq Toukan <tariqt@mellanox.com> Acked-by: Saeed Mahameed <saeedm@mellanox.com> Acked-by: Björn Töpel <bjorn.topel@intel.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'net/xdp')
-rw-r--r--net/xdp/xsk.c6
-rw-r--r--net/xdp/xsk_queue.h14
2 files changed, 20 insertions, 0 deletions
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)