From 12e9e70c89cd3fc9baa9b82ac21bce5ccb6c4d25 Mon Sep 17 00:00:00 2001 From: Tiwei Bie Date: Mon, 25 Mar 2019 13:27:16 +0800 Subject: [PATCH] net/virtio: define avail and used flags as constants We are consistently passing 1 as the argument in the data path, so there is no need to define avail/used flags as function-like macros anymore. This patch changes the avail and used flags to constants. And a frequently used combination is also introduced. Signed-off-by: Tiwei Bie Reviewed-by: Jens Freimann Reviewed-by: Maxime Coquelin --- drivers/net/virtio/virtio_ethdev.c | 10 ++++------ drivers/net/virtio/virtio_ring.h | 9 +++++++-- drivers/net/virtio/virtio_rxtx.c | 9 ++++----- .../net/virtio/virtio_user/virtio_user_dev.c | 17 ++++++++++------- drivers/net/virtio/virtqueue.h | 4 ++-- 5 files changed, 27 insertions(+), 22 deletions(-) diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c index 3100087574..2272bb2e56 100644 --- a/drivers/net/virtio/virtio_ethdev.c +++ b/drivers/net/virtio/virtio_ethdev.c @@ -168,8 +168,7 @@ virtio_send_command_packed(struct virtnet_ctl *cvq, nb_descs++; if (++vq->vq_avail_idx >= vq->vq_nentries) { vq->vq_avail_idx -= vq->vq_nentries; - vq->vq_packed.cached_flags ^= - VRING_DESC_F_AVAIL(1) | VRING_DESC_F_USED(1); + vq->vq_packed.cached_flags ^= VRING_PACKED_DESC_F_AVAIL_USED; } for (k = 0; k < pkt_num; k++) { @@ -185,7 +184,7 @@ virtio_send_command_packed(struct virtnet_ctl *cvq, if (++vq->vq_avail_idx >= vq->vq_nentries) { vq->vq_avail_idx -= vq->vq_nentries; vq->vq_packed.cached_flags ^= - VRING_DESC_F_AVAIL(1) | VRING_DESC_F_USED(1); + VRING_PACKED_DESC_F_AVAIL_USED; } } @@ -198,8 +197,7 @@ virtio_send_command_packed(struct virtnet_ctl *cvq, nb_descs++; if (++vq->vq_avail_idx >= vq->vq_nentries) { vq->vq_avail_idx -= vq->vq_nentries; - vq->vq_packed.cached_flags ^= - VRING_DESC_F_AVAIL(1) | VRING_DESC_F_USED(1); + vq->vq_packed.cached_flags ^= VRING_PACKED_DESC_F_AVAIL_USED; } virtio_wmb(vq->hw->weak_barriers); @@ -502,7 +500,7 @@ virtio_init_queue(struct rte_eth_dev *dev, uint16_t vtpci_queue_idx) vq->vq_nentries = vq_size; if (vtpci_packed_queue(hw)) { vq->vq_packed.used_wrap_counter = 1; - vq->vq_packed.cached_flags = VRING_DESC_F_AVAIL(1); + vq->vq_packed.cached_flags = VRING_PACKED_DESC_F_AVAIL; vq->vq_packed.event_flags_shadow = 0; if (queue_type == VTNET_RQ) vq->vq_packed.cached_flags |= VRING_DESC_F_WRITE; diff --git a/drivers/net/virtio/virtio_ring.h b/drivers/net/virtio/virtio_ring.h index 6abec4d871..7ba34662e5 100644 --- a/drivers/net/virtio/virtio_ring.h +++ b/drivers/net/virtio/virtio_ring.h @@ -15,10 +15,15 @@ #define VRING_DESC_F_WRITE 2 /* This means the buffer contains a list of buffer descriptors. */ #define VRING_DESC_F_INDIRECT 4 + /* This flag means the descriptor was made available by the driver */ -#define VRING_DESC_F_AVAIL(b) ((uint16_t)(b) << 7) +#define VRING_PACKED_DESC_F_AVAIL (1 << 7) /* This flag means the descriptor was used by the device */ -#define VRING_DESC_F_USED(b) ((uint16_t)(b) << 15) +#define VRING_PACKED_DESC_F_USED (1 << 15) + +/* Frequently used combinations */ +#define VRING_PACKED_DESC_F_AVAIL_USED (VRING_PACKED_DESC_F_AVAIL | \ + VRING_PACKED_DESC_F_USED) /* The Host uses this in used->flags to advise the Guest: don't kick me * when you add a buffer. It's unreliable, so it's simply an diff --git a/drivers/net/virtio/virtio_rxtx.c b/drivers/net/virtio/virtio_rxtx.c index 5f6796bdba..ee30084e41 100644 --- a/drivers/net/virtio/virtio_rxtx.c +++ b/drivers/net/virtio/virtio_rxtx.c @@ -461,7 +461,7 @@ virtqueue_enqueue_recv_refill_packed(struct virtqueue *vq, if (++vq->vq_avail_idx >= vq->vq_nentries) { vq->vq_avail_idx -= vq->vq_nentries; vq->vq_packed.cached_flags ^= - VRING_DESC_F_AVAIL(1) | VRING_DESC_F_USED(1); + VRING_PACKED_DESC_F_AVAIL_USED; flags = vq->vq_packed.cached_flags; } } @@ -660,8 +660,7 @@ virtqueue_enqueue_xmit_packed_fast(struct virtnet_tx *txvq, if (++vq->vq_avail_idx >= vq->vq_nentries) { vq->vq_avail_idx -= vq->vq_nentries; - vq->vq_packed.cached_flags ^= - VRING_DESC_F_AVAIL(1) | VRING_DESC_F_USED(1); + vq->vq_packed.cached_flags ^= VRING_PACKED_DESC_F_AVAIL_USED; } vq->vq_free_cnt--; @@ -728,7 +727,7 @@ virtqueue_enqueue_xmit_packed(struct virtnet_tx *txvq, struct rte_mbuf *cookie, if (idx >= vq->vq_nentries) { idx -= vq->vq_nentries; vq->vq_packed.cached_flags ^= - VRING_DESC_F_AVAIL(1) | VRING_DESC_F_USED(1); + VRING_PACKED_DESC_F_AVAIL_USED; } } @@ -749,7 +748,7 @@ virtqueue_enqueue_xmit_packed(struct virtnet_tx *txvq, struct rte_mbuf *cookie, if (idx >= vq->vq_nentries) { idx -= vq->vq_nentries; vq->vq_packed.cached_flags ^= - VRING_DESC_F_AVAIL(1) | VRING_DESC_F_USED(1); + VRING_PACKED_DESC_F_AVAIL_USED; } } while ((cookie = cookie->next) != NULL); diff --git a/drivers/net/virtio/virtio_user/virtio_user_dev.c b/drivers/net/virtio/virtio_user/virtio_user_dev.c index 07aabb5278..b004bc13a5 100644 --- a/drivers/net/virtio/virtio_user/virtio_user_dev.c +++ b/drivers/net/virtio/virtio_user/virtio_user_dev.c @@ -628,8 +628,10 @@ virtio_user_handle_ctrl_msg(struct virtio_user_dev *dev, struct vring *vring, static inline int desc_is_avail(struct vring_packed_desc *desc, bool wrap_counter) { - return wrap_counter == !!(desc->flags & VRING_DESC_F_AVAIL(1)) && - wrap_counter != !!(desc->flags & VRING_DESC_F_USED(1)); + uint16_t flags = desc->flags; + + return wrap_counter == !!(flags & VRING_PACKED_DESC_F_AVAIL) && + wrap_counter != !!(flags & VRING_PACKED_DESC_F_USED); } static uint32_t @@ -684,7 +686,7 @@ virtio_user_handle_cq_packed(struct virtio_user_dev *dev, uint16_t queue_idx) { struct virtio_user_queue *vq = &dev->packed_queues[queue_idx]; struct vring_packed *vring = &dev->packed_vrings[queue_idx]; - uint16_t n_descs; + uint16_t n_descs, flags; while (desc_is_avail(&vring->desc[vq->used_idx], vq->used_wrap_counter)) { @@ -692,11 +694,12 @@ virtio_user_handle_cq_packed(struct virtio_user_dev *dev, uint16_t queue_idx) n_descs = virtio_user_handle_ctrl_msg_packed(dev, vring, vq->used_idx); + flags = VRING_DESC_F_WRITE; + if (vq->used_wrap_counter) + flags |= VRING_PACKED_DESC_F_AVAIL_USED; + rte_smp_wmb(); - vring->desc[vq->used_idx].flags = - VRING_DESC_F_WRITE | - VRING_DESC_F_AVAIL(vq->used_wrap_counter) | - VRING_DESC_F_USED(vq->used_wrap_counter); + vring->desc[vq->used_idx].flags = flags; vq->used_idx += n_descs; if (vq->used_idx >= dev->queue_size) { diff --git a/drivers/net/virtio/virtqueue.h b/drivers/net/virtio/virtqueue.h index 5cea7cb4a2..e9dedc5da5 100644 --- a/drivers/net/virtio/virtqueue.h +++ b/drivers/net/virtio/virtqueue.h @@ -287,8 +287,8 @@ desc_is_used(struct vring_packed_desc *desc, struct virtqueue *vq) uint16_t used, avail, flags; flags = desc->flags; - used = !!(flags & VRING_DESC_F_USED(1)); - avail = !!(flags & VRING_DESC_F_AVAIL(1)); + used = !!(flags & VRING_PACKED_DESC_F_USED); + avail = !!(flags & VRING_PACKED_DESC_F_AVAIL); return avail == used && used == vq->vq_packed.used_wrap_counter; } -- 2.20.1