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authorDamjan Marion <damarion@cisco.com>2018-11-22 22:16:19 +0100
committerOle Trøan <otroan@employees.org>2018-11-23 11:41:14 +0000
commitba1afaae5179a756cdedd37a837127ee248c1ad6 (patch)
treef549029214d414e438a00b55e76066fe4410cb8a /src/vnet/devices/virtio/vhost_user_input.c
parent9282538f0984590369d8096704de61301889d8b0 (diff)
vhost-user: avoid global storage access
Change-Id: I9dbeff51d3ede6db3cd5a097623aa580e5e25042 Signed-off-by: Damjan Marion <damarion@cisco.com>
Diffstat (limited to 'src/vnet/devices/virtio/vhost_user_input.c')
-rw-r--r--src/vnet/devices/virtio/vhost_user_input.c60
1 files changed, 34 insertions, 26 deletions
diff --git a/src/vnet/devices/virtio/vhost_user_input.c b/src/vnet/devices/virtio/vhost_user_input.c
index 4fdfbd5d6e0..720119db2fb 100644
--- a/src/vnet/devices/virtio/vhost_user_input.c
+++ b/src/vnet/devices/virtio/vhost_user_input.c
@@ -92,10 +92,10 @@ static __clib_unused char *vhost_user_input_func_error_strings[] = {
static_always_inline void
vhost_user_rx_trace (vhost_trace_t * t,
vhost_user_intf_t * vui, u16 qid,
- vlib_buffer_t * b, vhost_user_vring_t * txvq)
+ vlib_buffer_t * b, vhost_user_vring_t * txvq,
+ u16 last_avail_idx)
{
vhost_user_main_t *vum = &vhost_user_main;
- u32 last_avail_idx = txvq->last_avail_idx;
u32 desc_current = txvq->avail->ring[last_avail_idx & txvq->qsz_mask];
vring_desc_t *hdr_desc = 0;
virtio_net_hdr_mrg_rxbuf_t *hdr;
@@ -195,24 +195,26 @@ vhost_user_rx_discard_packet (vlib_main_t * vm,
*/
u32 discarded_packets = 0;
u32 avail_idx = txvq->avail->idx;
+ u16 mask = txvq->qsz_mask;
+ u16 last_avail_idx = txvq->last_avail_idx;
+ u16 last_used_idx = txvq->last_used_idx;
while (discarded_packets != discard_max)
{
if (avail_idx == txvq->last_avail_idx)
goto out;
- u16 desc_chain_head =
- txvq->avail->ring[txvq->last_avail_idx & txvq->qsz_mask];
- txvq->last_avail_idx++;
- txvq->used->ring[txvq->last_used_idx & txvq->qsz_mask].id =
- desc_chain_head;
- txvq->used->ring[txvq->last_used_idx & txvq->qsz_mask].len = 0;
- vhost_user_log_dirty_ring (vui, txvq,
- ring[txvq->last_used_idx & txvq->qsz_mask]);
- txvq->last_used_idx++;
+ u16 desc_chain_head = txvq->avail->ring[last_avail_idx & mask];
+ last_avail_idx++;
+ txvq->used->ring[last_used_idx & mask].id = desc_chain_head;
+ txvq->used->ring[last_used_idx & mask].len = 0;
+ vhost_user_log_dirty_ring (vui, txvq, ring[last_used_idx & mask]);
+ last_used_idx++;
discarded_packets++;
}
out:
+ txvq->last_avail_idx = last_avail_idx;
+ txvq->last_used_idx = last_used_idx;
CLIB_MEMORY_BARRIER ();
txvq->used->idx = txvq->last_used_idx;
vhost_user_log_dirty_ring (vui, txvq, idx);
@@ -261,10 +263,11 @@ vhost_user_if_input (vlib_main_t * vm,
u16 copy_len = 0;
u8 feature_arc_idx = fm->device_input_feature_arc_index;
u32 current_config_index = ~(u32) 0;
+ u16 mask = txvq->qsz_mask;
/* The descriptor table is not ready yet */
if (PREDICT_FALSE (txvq->avail == 0))
- return 0;
+ goto done;
{
/* do we have pending interrupts ? */
@@ -299,13 +302,13 @@ vhost_user_if_input (vlib_main_t * vm,
}
if (PREDICT_FALSE (txvq->avail->flags & 0xFFFE))
- return 0;
+ goto done;
n_left = (u16) (txvq->avail->idx - txvq->last_avail_idx);
/* nothing to do */
if (PREDICT_FALSE (n_left == 0))
- return 0;
+ goto done;
if (PREDICT_FALSE (!vui->admin_up || !(txvq->enabled)))
{
@@ -318,10 +321,10 @@ vhost_user_if_input (vlib_main_t * vm,
*/
vhost_user_rx_discard_packet (vm, vui, txvq,
VHOST_USER_DOWN_DISCARD_COUNT);
- return 0;
+ goto done;
}
- if (PREDICT_FALSE (n_left == (txvq->qsz_mask + 1)))
+ if (PREDICT_FALSE (n_left == (mask + 1)))
{
/*
* Informational error logging when VPP is not
@@ -382,6 +385,9 @@ vhost_user_if_input (vlib_main_t * vm,
&next_index, 0);
}
+ u16 last_avail_idx = txvq->last_avail_idx;
+ u16 last_used_idx = txvq->last_used_idx;
+
vlib_get_new_next_frame (vm, node, next_index, to_next, n_left_to_next);
if (next_index == VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT)
@@ -417,7 +423,7 @@ vhost_user_if_input (vlib_main_t * vm,
break;
}
- desc_current = txvq->avail->ring[txvq->last_avail_idx & txvq->qsz_mask];
+ desc_current = txvq->avail->ring[last_avail_idx & mask];
cpu->rx_buffers_len--;
bi_current = cpu->rx_buffers[cpu->rx_buffers_len];
b_head = b_current = vlib_get_buffer (vm, bi_current);
@@ -429,11 +435,9 @@ vhost_user_if_input (vlib_main_t * vm,
(vm, cpu->rx_buffers[cpu->rx_buffers_len - 1], LOAD);
/* Just preset the used descriptor id and length for later */
- txvq->used->ring[txvq->last_used_idx & txvq->qsz_mask].id =
- desc_current;
- txvq->used->ring[txvq->last_used_idx & txvq->qsz_mask].len = 0;
- vhost_user_log_dirty_ring (vui, txvq,
- ring[txvq->last_used_idx & txvq->qsz_mask]);
+ txvq->used->ring[last_used_idx & mask].id = desc_current;
+ txvq->used->ring[last_used_idx & mask].len = 0;
+ vhost_user_log_dirty_ring (vui, txvq, ring[last_used_idx & mask]);
/* The buffer should already be initialized */
b_head->total_length_not_including_first_buffer = 0;
@@ -446,7 +450,7 @@ vhost_user_if_input (vlib_main_t * vm,
/* follow_chain */ 0);
vhost_trace_t *t0 =
vlib_add_trace (vm, node, b_head, sizeof (t0[0]));
- vhost_user_rx_trace (t0, vui, qid, b_head, txvq);
+ vhost_user_rx_trace (t0, vui, qid, b_head, txvq, last_avail_idx);
n_trace--;
vlib_set_trace_count (vm, node, n_trace);
}
@@ -552,8 +556,8 @@ vhost_user_if_input (vlib_main_t * vm,
b_head->current_length;
/* consume the descriptor and return it as used */
- txvq->last_avail_idx++;
- txvq->last_used_idx++;
+ last_avail_idx++;
+ last_used_idx++;
VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b_head);
@@ -586,13 +590,16 @@ vhost_user_if_input (vlib_main_t * vm,
/* give buffers back to driver */
CLIB_MEMORY_BARRIER ();
- txvq->used->idx = txvq->last_used_idx;
+ txvq->used->idx = last_used_idx;
vhost_user_log_dirty_ring (vui, txvq, idx);
}
}
stop:
vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+ txvq->last_used_idx = last_used_idx;
+ txvq->last_avail_idx = last_avail_idx;
+
/* Do the memory copies */
if (PREDICT_FALSE (vhost_user_input_copy (vui, cpu->copy, copy_len,
&map_hint)))
@@ -624,6 +631,7 @@ stop:
vnet_device_increment_rx_packets (vm->thread_index, n_rx_packets);
+done:
return n_rx_packets;
}