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-rw-r--r--src/vnet/devices/virtio/vhost-user.c35
1 files changed, 33 insertions, 2 deletions
diff --git a/src/vnet/devices/virtio/vhost-user.c b/src/vnet/devices/virtio/vhost-user.c
index 6b2c898acd5..7470f15b1c3 100644
--- a/src/vnet/devices/virtio/vhost-user.c
+++ b/src/vnet/devices/virtio/vhost-user.c
@@ -86,6 +86,16 @@
* The value 64 was obtained by testing (48 and 128 were not as good).
*/
#define VHOST_USER_RX_COPY_THRESHOLD 64
+/*
+ * On the transmit side, we keep processing the buffers from vlib in the while
+ * loop and prepare the copy order to be executed later. However, the static
+ * array which we keep the copy order is limited to VHOST_USER_COPY_ARRAY_N
+ * entries. In order to not corrupt memory, we have to do the copy when the
+ * static array reaches the copy threshold. We subtract 40 in case the code
+ * goes into the inner loop for a maximum of 64k frames which may require
+ * more array entries.
+ */
+#define VHOST_USER_TX_COPY_THRESHOLD (VHOST_USER_COPY_ARRAY_N - 40)
#define UNIX_GET_FD(unixfd_idx) \
(unixfd_idx != ~0) ? \
@@ -2000,7 +2010,7 @@ vhost_user_tx (vlib_main_t * vm,
qid =
VHOST_VRING_IDX_RX (*vec_elt_at_index
- (vui->per_cpu_tx_qid, vlib_get_thread_index ()));
+ (vui->per_cpu_tx_qid, thread_index));
rxvq = &vui->vrings[qid];
if (PREDICT_FALSE (vui->use_tx_spinlock))
vhost_user_vring_lock (vui, qid);
@@ -2212,6 +2222,27 @@ retry:
}
n_left--; //At the end for error counting when 'goto done' is invoked
+
+ /*
+ * Do the copy periodically to prevent
+ * vum->cpus[thread_index].copy array overflow and corrupt memory
+ */
+ if (PREDICT_FALSE (copy_len >= VHOST_USER_TX_COPY_THRESHOLD))
+ {
+ if (PREDICT_FALSE
+ (vhost_user_tx_copy (vui, vum->cpus[thread_index].copy,
+ copy_len, &map_hint)))
+ {
+ vlib_error_count (vm, node->node_index,
+ VHOST_USER_TX_FUNC_ERROR_MMAP_FAIL, 1);
+ }
+ copy_len = 0;
+
+ /* give buffers back to driver */
+ CLIB_MEMORY_BARRIER ();
+ rxvq->used->idx = rxvq->last_used_idx;
+ vhost_user_log_dirty_ring (vui, rxvq, idx);
+ }
buffers++;
}
@@ -2266,7 +2297,7 @@ done3:
vlib_increment_simple_counter
(vnet_main.interface_main.sw_if_counters
+ VNET_INTERFACE_COUNTER_DROP,
- vlib_get_thread_index (), vui->sw_if_index, n_left);
+ thread_index, vui->sw_if_index, n_left);
}
vlib_buffer_free (vm, vlib_frame_args (frame), frame->n_vectors);