diff options
| author |   Magnus Karlsson <magnus.karlsson@intel.com> | 2018-06-04 14:05:57 +0200 |
|---|---|---|
| committer |   Daniel Borkmann <daniel@iogearbox.net> | 2018-06-05 15:48:34 +0200 |
| commit | ac98d8aab61baf785eb8f099b36daf34fc76a70e (patch) | |
| tree | c0fa347892f50786cd516e5eb4396abf69bebb0d /net/xdp/xsk_queue.h | |
| parent | net: added netdevice operation for Tx (diff) | |
| download | linux-dev-ac98d8aab61baf785eb8f099b36daf34fc76a70e.tar.xz linux-dev-ac98d8aab61baf785eb8f099b36daf34fc76a70e.zip | |
xsk: wire upp Tx zero-copy functions
Here we add the functionality required to support zero-copy Tx, and
also exposes various zero-copy related functions for the netdevs.
Signed-off-by: Magnus Karlsson <magnus.karlsson@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to '')
| -rw-r--r-- | net/xdp/xsk_queue.h | 32 |
1 files changed, 31 insertions, 1 deletions
diff --git a/net/xdp/xsk_queue.h b/net/xdp/xsk_queue.h index 5246ed420a16..ef6a6f0ec949 100644 --- a/net/xdp/xsk_queue.h +++ b/net/xdp/xsk_queue.h @@ -11,6 +11,7 @@ #include <net/xdp_sock.h> #define RX_BATCH_SIZE 16 +#define LAZY_UPDATE_THRESHOLD 128 struct xdp_ring { u32 producer ____cacheline_aligned_in_smp; @@ -61,9 +62,14 @@ static inline u32 xskq_nb_avail(struct xsk_queue *q, u32 dcnt) return (entries > dcnt) ? dcnt : entries; } +static inline u32 xskq_nb_free_lazy(struct xsk_queue *q, u32 producer) +{ + return q->nentries - (producer - q->cons_tail); +} + static inline u32 xskq_nb_free(struct xsk_queue *q, u32 producer, u32 dcnt) { - u32 free_entries = q->nentries - (producer - q->cons_tail); + u32 free_entries = xskq_nb_free_lazy(q, producer); if (free_entries >= dcnt) return free_entries; @@ -123,6 +129,9 @@ static inline int xskq_produce_addr(struct xsk_queue *q, u64 addr) { struct xdp_umem_ring *ring = (struct xdp_umem_ring *)q->ring; + if (xskq_nb_free(q, q->prod_tail, LAZY_UPDATE_THRESHOLD) == 0) + return -ENOSPC; + ring->desc[q->prod_tail++ & q->ring_mask] = addr; /* Order producer and data */ @@ -132,6 +141,27 @@ static inline int xskq_produce_addr(struct xsk_queue *q, u64 addr) return 0; } +static inline int xskq_produce_addr_lazy(struct xsk_queue *q, u64 addr) +{ + struct xdp_umem_ring *ring = (struct xdp_umem_ring *)q->ring; + + if (xskq_nb_free(q, q->prod_head, LAZY_UPDATE_THRESHOLD) == 0) + return -ENOSPC; + + ring->desc[q->prod_head++ & q->ring_mask] = addr; + return 0; +} + +static inline void xskq_produce_flush_addr_n(struct xsk_queue *q, + u32 nb_entries) +{ + /* Order producer and data */ + smp_wmb(); + + q->prod_tail += nb_entries; + WRITE_ONCE(q->ring->producer, q->prod_tail); +} + static inline int xskq_reserve_addr(struct xsk_queue *q) { if (xskq_nb_free(q, q->prod_head, 1) == 0) |