diff options
Diffstat (limited to 'vnet')
| -rw-r--r-- | vnet/vnet/devices/virtio/vhost-user.c | 363 |
1 files changed, 187 insertions, 176 deletions
diff --git a/vnet/vnet/devices/virtio/vhost-user.c b/vnet/vnet/devices/virtio/vhost-user.c index 1a2cf633fd9..4c228633cd7 100644 --- a/vnet/vnet/devices/virtio/vhost-user.c +++ b/vnet/vnet/devices/virtio/vhost-user.c @@ -1792,6 +1792,7 @@ vhost_user_intfc_tx (vlib_main_t * vm, u32 map_guest_hint_indirect = 0; u32 *map_guest_hint_p = &map_guest_hint_desc; vhost_trace_t *current_trace = 0; + int n_retry; if (PREDICT_FALSE (!vui->is_up || !vui->admin_up)) { @@ -1812,228 +1813,238 @@ vhost_user_intfc_tx (vlib_main_t * vm, } qsz_mask = rxvq->qsz - 1; /* qsz is always power of 2 */ + n_retry = 8; - while (n_left > 0) + while (n_left > 0 && n_retry--) { - vlib_buffer_t *b0, *current_b0; - u16 desc_head, desc_index, desc_len; - vring_desc_t *desc_table; - void *buffer_addr; - u32 buffer_len; - - b0 = vlib_get_buffer (vm, buffers[0]); - buffers++; - if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) + while (n_left > 0) { - current_trace = vlib_add_trace (vm, node, b0, - sizeof (*current_trace)); - vhost_user_tx_trace (current_trace, vui, qid / 2, b0, rxvq); - } + vlib_buffer_t *b0, *current_b0; + u16 desc_head, desc_index, desc_len; + vring_desc_t *desc_table; + void *buffer_addr; + u32 buffer_len; - if (PREDICT_FALSE (rxvq->last_avail_idx == rxvq->avail->idx)) - { - error = VHOST_USER_TX_FUNC_ERROR_PKT_DROP_NOBUF; - goto done; - } + b0 = vlib_get_buffer (vm, buffers[0]); - desc_table = rxvq->desc; - map_guest_hint_p = &map_guest_hint_desc; - desc_head = desc_index = - rxvq->avail->ring[rxvq->last_avail_idx & qsz_mask]; - if (rxvq->desc[desc_head].flags & VIRTQ_DESC_F_INDIRECT) - { - if (PREDICT_FALSE - (rxvq->desc[desc_head].len < sizeof (vring_desc_t))) + if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) { - error = VHOST_USER_TX_FUNC_ERROR_INDIRECT_OVERFLOW; - goto done; + current_trace = vlib_add_trace (vm, node, b0, + sizeof (*current_trace)); + vhost_user_tx_trace (current_trace, vui, qid / 2, b0, rxvq); } - if (PREDICT_FALSE - (!(desc_table = - map_guest_mem (vui, rxvq->desc[desc_index].addr, - &map_guest_hint_desc)))) + + if (PREDICT_FALSE (rxvq->last_avail_idx == rxvq->avail->idx)) { - error = VHOST_USER_TX_FUNC_ERROR_MMAP_FAIL; + error = VHOST_USER_TX_FUNC_ERROR_PKT_DROP_NOBUF; goto done; } - desc_index = 0; - map_guest_hint_p = &map_guest_hint_indirect; - } - - desc_len = vui->virtio_net_hdr_sz; - - if (PREDICT_FALSE - (!(buffer_addr = - map_guest_mem (vui, desc_table[desc_index].addr, - map_guest_hint_p)))) - { - error = VHOST_USER_TX_FUNC_ERROR_MMAP_FAIL; - goto done; - } - buffer_len = desc_table[desc_index].len; - - CLIB_PREFETCH (buffer_addr, CLIB_CACHE_LINE_BYTES, STORE); - virtio_net_hdr_mrg_rxbuf_t *hdr = - (virtio_net_hdr_mrg_rxbuf_t *) buffer_addr; - hdr->hdr.flags = 0; - hdr->hdr.gso_type = 0; - if (vui->virtio_net_hdr_sz == 12) - hdr->num_buffers = 1; - - vhost_user_log_dirty_pages (vui, desc_table[desc_index].addr, - vui->virtio_net_hdr_sz); - - u16 bytes_left = b0->current_length; - buffer_addr += vui->virtio_net_hdr_sz; - buffer_len -= vui->virtio_net_hdr_sz; - current_b0 = b0; - while (1) - { - if (!bytes_left) - { //Get new input - if (current_b0->flags & VLIB_BUFFER_NEXT_PRESENT) + desc_table = rxvq->desc; + map_guest_hint_p = &map_guest_hint_desc; + desc_head = desc_index = + rxvq->avail->ring[rxvq->last_avail_idx & qsz_mask]; + if (rxvq->desc[desc_head].flags & VIRTQ_DESC_F_INDIRECT) + { + if (PREDICT_FALSE + (rxvq->desc[desc_head].len < sizeof (vring_desc_t))) { - current_b0 = vlib_get_buffer (vm, current_b0->next_buffer); - bytes_left = current_b0->current_length; + error = VHOST_USER_TX_FUNC_ERROR_INDIRECT_OVERFLOW; + goto done; } - else + if (PREDICT_FALSE + (!(desc_table = + map_guest_mem (vui, rxvq->desc[desc_index].addr, + &map_guest_hint_desc)))) { - //End of packet - break; + error = VHOST_USER_TX_FUNC_ERROR_MMAP_FAIL; + goto done; } + desc_index = 0; + map_guest_hint_p = &map_guest_hint_indirect; } - if (buffer_len == 0) - { //Get new output - if (desc_table[desc_index].flags & VIRTQ_DESC_F_NEXT) - { - //Next one is chained - desc_index = desc_table[desc_index].next; - if (PREDICT_FALSE - (!(buffer_addr = - map_guest_mem (vui, desc_table[desc_index].addr, - map_guest_hint_p)))) + desc_len = vui->virtio_net_hdr_sz; + + if (PREDICT_FALSE + (!(buffer_addr = + map_guest_mem (vui, desc_table[desc_index].addr, + map_guest_hint_p)))) + { + error = VHOST_USER_TX_FUNC_ERROR_MMAP_FAIL; + goto done; + } + buffer_len = desc_table[desc_index].len; + + CLIB_PREFETCH (buffer_addr, CLIB_CACHE_LINE_BYTES, STORE); + + virtio_net_hdr_mrg_rxbuf_t *hdr = + (virtio_net_hdr_mrg_rxbuf_t *) buffer_addr; + hdr->hdr.flags = 0; + hdr->hdr.gso_type = 0; + if (vui->virtio_net_hdr_sz == 12) + hdr->num_buffers = 1; + + vhost_user_log_dirty_pages (vui, desc_table[desc_index].addr, + vui->virtio_net_hdr_sz); + + u16 bytes_left = b0->current_length; + buffer_addr += vui->virtio_net_hdr_sz; + buffer_len -= vui->virtio_net_hdr_sz; + current_b0 = b0; + while (1) + { + if (!bytes_left) + { //Get new input + if (current_b0->flags & VLIB_BUFFER_NEXT_PRESENT) { - rxvq->last_used_idx -= hdr->num_buffers - 1; - rxvq->last_avail_idx -= hdr->num_buffers - 1; - error = VHOST_USER_TX_FUNC_ERROR_MMAP_FAIL; - goto done; + current_b0 = + vlib_get_buffer (vm, current_b0->next_buffer); + bytes_left = current_b0->current_length; } - buffer_len = desc_table[desc_index].len; - } - else if (vui->virtio_net_hdr_sz == 12) //MRG is available - { - //Move from available to used buffer - rxvq->used->ring[rxvq->last_used_idx & qsz_mask].id = - desc_head; - rxvq->used->ring[rxvq->last_used_idx & qsz_mask].len = - desc_len; - vhost_user_log_dirty_ring (vui, rxvq, - ring[rxvq->last_used_idx & - qsz_mask]); - rxvq->last_avail_idx++; - rxvq->last_used_idx++; - hdr->num_buffers++; - - if (PREDICT_FALSE - (rxvq->last_avail_idx == rxvq->avail->idx)) + else { - //Dequeue queued descriptors for this packet - rxvq->last_used_idx -= hdr->num_buffers - 1; - rxvq->last_avail_idx -= hdr->num_buffers - 1; - error = VHOST_USER_TX_FUNC_ERROR_PKT_DROP_NOBUF; - goto done; + //End of packet + break; } + } - desc_table = rxvq->desc; - map_guest_hint_p = &map_guest_hint_desc; - desc_head = desc_index = - rxvq->avail->ring[rxvq->last_avail_idx & qsz_mask]; - if (PREDICT_FALSE - (rxvq->desc[desc_head].flags & VIRTQ_DESC_F_INDIRECT)) + if (buffer_len == 0) + { //Get new output + if (desc_table[desc_index].flags & VIRTQ_DESC_F_NEXT) + { + //Next one is chained + desc_index = desc_table[desc_index].next; + if (PREDICT_FALSE + (!(buffer_addr = + map_guest_mem (vui, desc_table[desc_index].addr, + map_guest_hint_p)))) + { + rxvq->last_used_idx -= hdr->num_buffers - 1; + rxvq->last_avail_idx -= hdr->num_buffers - 1; + error = VHOST_USER_TX_FUNC_ERROR_MMAP_FAIL; + goto done; + } + buffer_len = desc_table[desc_index].len; + } + else if (vui->virtio_net_hdr_sz == 12) //MRG is available { - //It is seriously unlikely that a driver will put indirect descriptor - //after non-indirect descriptor. + //Move from available to used buffer + rxvq->used->ring[rxvq->last_used_idx & qsz_mask].id = + desc_head; + rxvq->used->ring[rxvq->last_used_idx & qsz_mask].len = + desc_len; + vhost_user_log_dirty_ring (vui, rxvq, + ring[rxvq->last_used_idx & + qsz_mask]); + rxvq->last_avail_idx++; + rxvq->last_used_idx++; + hdr->num_buffers++; + if (PREDICT_FALSE - (rxvq->desc[desc_head].len < sizeof (vring_desc_t))) + (rxvq->last_avail_idx == rxvq->avail->idx)) { - error = VHOST_USER_TX_FUNC_ERROR_INDIRECT_OVERFLOW; + //Dequeue queued descriptors for this packet + rxvq->last_used_idx -= hdr->num_buffers - 1; + rxvq->last_avail_idx -= hdr->num_buffers - 1; + error = VHOST_USER_TX_FUNC_ERROR_PKT_DROP_NOBUF; goto done; } + + desc_table = rxvq->desc; + map_guest_hint_p = &map_guest_hint_desc; + desc_head = desc_index = + rxvq->avail->ring[rxvq->last_avail_idx & qsz_mask]; if (PREDICT_FALSE - (!(desc_table = - map_guest_mem (vui, - rxvq->desc[desc_index].addr, - &map_guest_hint_desc)))) + (rxvq-> + desc[desc_head].flags & VIRTQ_DESC_F_INDIRECT)) + { + //It is seriously unlikely that a driver will put indirect descriptor + //after non-indirect descriptor. + if (PREDICT_FALSE + (rxvq->desc[desc_head].len < + sizeof (vring_desc_t))) + { + error = + VHOST_USER_TX_FUNC_ERROR_INDIRECT_OVERFLOW; + goto done; + } + if (PREDICT_FALSE + (!(desc_table = + map_guest_mem (vui, + rxvq->desc[desc_index].addr, + &map_guest_hint_desc)))) + { + error = VHOST_USER_TX_FUNC_ERROR_MMAP_FAIL; + goto done; + } + desc_index = 0; + map_guest_hint_p = &map_guest_hint_indirect; + } + + if (PREDICT_FALSE + (!(buffer_addr = + map_guest_mem (vui, desc_table[desc_index].addr, + map_guest_hint_p)))) { error = VHOST_USER_TX_FUNC_ERROR_MMAP_FAIL; goto done; } - desc_index = 0; - map_guest_hint_p = &map_guest_hint_indirect; + buffer_len = desc_table[desc_index].len; + CLIB_PREFETCH (buffer_addr, CLIB_CACHE_LINE_BYTES, + STORE); } - - if (PREDICT_FALSE - (!(buffer_addr = - map_guest_mem (vui, desc_table[desc_index].addr, - map_guest_hint_p)))) + else { - error = VHOST_USER_TX_FUNC_ERROR_MMAP_FAIL; + error = VHOST_USER_TX_FUNC_ERROR_PKT_DROP_NOMRG; goto done; } - buffer_len = desc_table[desc_index].len; - CLIB_PREFETCH (buffer_addr, CLIB_CACHE_LINE_BYTES, STORE); - } - else - { - error = VHOST_USER_TX_FUNC_ERROR_PKT_DROP_NOMRG; - goto done; } + + u16 bytes_to_copy = bytes_left; + bytes_to_copy = + (bytes_to_copy > buffer_len) ? buffer_len : bytes_to_copy; + clib_memcpy (buffer_addr, + vlib_buffer_get_current (current_b0) + + current_b0->current_length - bytes_left, + bytes_to_copy); + + vhost_user_log_dirty_pages (vui, + desc_table[desc_index].addr + + desc_table[desc_index].len - + bytes_left - bytes_to_copy, + bytes_to_copy); + + CLIB_PREFETCH (rxvq, sizeof (*rxvq), STORE); + bytes_left -= bytes_to_copy; + buffer_len -= bytes_to_copy; + buffer_addr += bytes_to_copy; + desc_len += bytes_to_copy; } - u16 bytes_to_copy = bytes_left; - bytes_to_copy = - (bytes_to_copy > buffer_len) ? buffer_len : bytes_to_copy; - clib_memcpy (buffer_addr, - vlib_buffer_get_current (current_b0) + - current_b0->current_length - bytes_left, - bytes_to_copy); - - vhost_user_log_dirty_pages (vui, - desc_table[desc_index].addr + - desc_table[desc_index].len - - bytes_left - bytes_to_copy, - bytes_to_copy); - - CLIB_PREFETCH (rxvq, sizeof (*rxvq), STORE); - bytes_left -= bytes_to_copy; - buffer_len -= bytes_to_copy; - buffer_addr += bytes_to_copy; - desc_len += bytes_to_copy; - } + //Move from available to used ring + rxvq->used->ring[rxvq->last_used_idx & qsz_mask].id = desc_head; + rxvq->used->ring[rxvq->last_used_idx & qsz_mask].len = desc_len; + vhost_user_log_dirty_ring (vui, rxvq, + ring[rxvq->last_used_idx & qsz_mask]); - //Move from available to used ring - rxvq->used->ring[rxvq->last_used_idx & qsz_mask].id = desc_head; - rxvq->used->ring[rxvq->last_used_idx & qsz_mask].len = desc_len; - vhost_user_log_dirty_ring (vui, rxvq, - ring[rxvq->last_used_idx & qsz_mask]); + rxvq->last_avail_idx++; + rxvq->last_used_idx++; - rxvq->last_avail_idx++; - rxvq->last_used_idx++; + if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) + current_trace->hdr = *hdr; - if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) - current_trace->hdr = *hdr; + buffers++; + n_left--; //At the end for error counting when 'goto done' is invoked + } - n_left--; //At the end for error counting when 'goto done' is invoked + done: + CLIB_MEMORY_BARRIER (); + rxvq->used->idx = rxvq->last_used_idx; + vhost_user_log_dirty_ring (vui, rxvq, idx); } -done: - CLIB_MEMORY_BARRIER (); - rxvq->used->idx = rxvq->last_used_idx; - vhost_user_log_dirty_ring (vui, rxvq, idx); - /* interrupt (call) handling */ if ((rxvq->callfd > -1) && !(rxvq->avail->flags & 1)) { |