X-Git-Url: https://gerrit.fd.io/r/gitweb?a=blobdiff_plain;f=src%2Fvnet%2Fdevices%2Fvirtio%2Fdevice.c;h=367372fa29a41ca451767f4a09ae43676d624082;hb=ce21599c8af34a3f9da813a3c953a38a16316b4d;hp=856e5f275e3d42f0f1f27da8eaf579016962cd33;hpb=529f0e97b6064039c500adce0d54b738954b2ffa;p=vpp.git diff --git a/src/vnet/devices/virtio/device.c b/src/vnet/devices/virtio/device.c index 856e5f275e3..367372fa29a 100644 --- a/src/vnet/devices/virtio/device.c +++ b/src/vnet/devices/virtio/device.c @@ -21,6 +21,7 @@ #include #include +#include #include #include #include @@ -33,8 +34,10 @@ _(NO_FREE_SLOTS, "no free tx slots") \ _(TRUNC_PACKET, "packet > buffer size -- truncated in tx ring") \ _(PENDING_MSGS, "pending msgs in tx ring") \ -_(NO_TX_QUEUES, "no tx queues") \ -_(OUT_OF_ORDER, "out-of-order buffers in used ring") +_(INDIRECT_DESC_ALLOC_FAILED, "indirect descriptor allocation failed - packet drop") \ +_(OUT_OF_ORDER, "out-of-order buffers in used ring") \ +_(GSO_PACKET_DROP, "gso disabled on itf -- gso packet drop") \ +_(CSUM_OFFLOAD_PACKET_DROP, "checksum offload disabled on itf -- csum offload packet drop") typedef enum { @@ -73,6 +76,15 @@ format_virtio_tx_trace (u8 * s, va_list * args) return s; } +static_always_inline void +virtio_interface_drop_inline (vlib_main_t * vm, uword node_index, + u32 * buffers, u16 n, + virtio_tx_func_error_t error) +{ + vlib_error_count (vm, node_index, error, n); + vlib_buffer_free (vm, buffers, n); +} + static_always_inline void virtio_memset_ring_u32 (u32 * ring, u32 start, u32 ring_size, u32 n_buffers) { @@ -114,6 +126,14 @@ virtio_free_used_device_desc (vlib_main_t * vm, virtio_vring_t * vring, n_left--; last++; n_buffers++; + struct vring_desc *d = &vring->desc[e->id]; + u16 next; + while (d->flags & VRING_DESC_F_NEXT) + { + n_buffers++; + next = d->next; + d = &vring->desc[next]; + } if (n_left == 0) break; e = &vring->used->ring[last & mask]; @@ -148,8 +168,7 @@ virtio_free_used_device_desc (vlib_main_t * vm, virtio_vring_t * vring, } static_always_inline void -set_checksum_offsets (vlib_main_t * vm, virtio_if_t * vif, vlib_buffer_t * b, - struct virtio_net_hdr_v1 *hdr) +set_checksum_offsets (vlib_buffer_t * b, struct virtio_net_hdr_v1 *hdr) { if (b->flags & VNET_BUFFER_F_IS_IP4) { @@ -158,9 +177,13 @@ set_checksum_offsets (vlib_main_t * vm, virtio_if_t * vif, vlib_buffer_t * b, hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; hdr->csum_start = gho.l4_hdr_offset; // 0x22; if (b->flags & VNET_BUFFER_F_OFFLOAD_TCP_CKSUM) - hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum); + { + hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum); + } else if (b->flags & VNET_BUFFER_F_OFFLOAD_UDP_CKSUM) - hdr->csum_offset = STRUCT_OFFSET_OF (udp_header_t, checksum); + { + hdr->csum_offset = STRUCT_OFFSET_OF (udp_header_t, checksum); + } /* * virtio devices do not support IP4 checksum offload. So driver takes care @@ -177,16 +200,55 @@ set_checksum_offsets (vlib_main_t * vm, virtio_if_t * vif, vlib_buffer_t * b, hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; hdr->csum_start = gho.l4_hdr_offset; // 0x36; if (b->flags & VNET_BUFFER_F_OFFLOAD_TCP_CKSUM) - hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum); + { + hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum); + } else if (b->flags & VNET_BUFFER_F_OFFLOAD_UDP_CKSUM) - hdr->csum_offset = STRUCT_OFFSET_OF (udp_header_t, checksum); + { + hdr->csum_offset = STRUCT_OFFSET_OF (udp_header_t, checksum); + } + } +} + +static_always_inline void +set_gso_offsets (vlib_buffer_t * b, struct virtio_net_hdr_v1 *hdr) +{ + if (b->flags & VNET_BUFFER_F_IS_IP4) + { + ip4_header_t *ip4; + gso_header_offset_t gho = vnet_gso_header_offset_parser (b, 0); + hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4; + hdr->gso_size = vnet_buffer2 (b)->gso_size; + hdr->hdr_len = gho.l4_hdr_offset + gho.l4_hdr_sz; + hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; + hdr->csum_start = gho.l4_hdr_offset; // 0x22; + hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum); + ip4 = + (ip4_header_t *) (vlib_buffer_get_current (b) + gho.l3_hdr_offset); + /* + * virtio devices do not support IP4 checksum offload. So driver takes care + * of it while doing tx. + */ + if (b->flags & VNET_BUFFER_F_OFFLOAD_IP_CKSUM) + ip4->checksum = ip4_header_checksum (ip4); + } + else if (b->flags & VNET_BUFFER_F_IS_IP6) + { + gso_header_offset_t gho = vnet_gso_header_offset_parser (b, 1); + hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6; + hdr->gso_size = vnet_buffer2 (b)->gso_size; + hdr->hdr_len = gho.l4_hdr_offset + gho.l4_hdr_sz; + hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; + hdr->csum_start = gho.l4_hdr_offset; // 0x36; + hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum); } } static_always_inline u16 add_buffer_to_slot (vlib_main_t * vm, virtio_if_t * vif, - virtio_vring_t * vring, u32 bi, u16 avail, u16 next, - u16 mask, int do_gso, int csum_offload) + virtio_vring_t * vring, u32 bi, u16 free_desc_count, + u16 avail, u16 next, u16 mask, int do_gso, + int csum_offload, uword node_index) { u16 n_added = 0; int hdr_sz = vif->virtio_net_hdr_sz; @@ -197,44 +259,28 @@ add_buffer_to_slot (vlib_main_t * vm, virtio_if_t * vif, clib_memset (hdr, 0, hdr_sz); - if (do_gso && (b->flags & VNET_BUFFER_F_GSO)) + if (b->flags & VNET_BUFFER_F_GSO) { - if (b->flags & VNET_BUFFER_F_IS_IP4) - { - ip4_header_t *ip4; - gso_header_offset_t gho = vnet_gso_header_offset_parser (b, 0); - hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4; - hdr->gso_size = vnet_buffer2 (b)->gso_size; - hdr->hdr_len = gho.l4_hdr_offset + gho.l4_hdr_sz; - hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; - hdr->csum_start = gho.l4_hdr_offset; // 0x22; - hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum); - ip4 = - (ip4_header_t *) (vlib_buffer_get_current (b) + - gho.l3_hdr_offset); - /* - * virtio devices do not support IP4 checksum offload. So driver takes care - * of it while doing tx. - */ - if (b->flags & VNET_BUFFER_F_OFFLOAD_IP_CKSUM) - ip4->checksum = ip4_header_checksum (ip4); - } - else if (b->flags & VNET_BUFFER_F_IS_IP6) + if (do_gso) + set_gso_offsets (b, hdr); + else { - gso_header_offset_t gho = vnet_gso_header_offset_parser (b, 1); - hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6; - hdr->gso_size = vnet_buffer2 (b)->gso_size; - hdr->hdr_len = gho.l4_hdr_offset + gho.l4_hdr_sz; - hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; - hdr->csum_start = gho.l4_hdr_offset; // 0x36; - hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum); + virtio_interface_drop_inline (vm, node_index, &bi, 1, + VIRTIO_TX_ERROR_GSO_PACKET_DROP); + return n_added; } } - else if (csum_offload - && (b->flags & (VNET_BUFFER_F_OFFLOAD_TCP_CKSUM | - VNET_BUFFER_F_OFFLOAD_UDP_CKSUM))) + else if (b->flags & (VNET_BUFFER_F_OFFLOAD_TCP_CKSUM | + VNET_BUFFER_F_OFFLOAD_UDP_CKSUM)) { - set_checksum_offsets (vm, vif, b, hdr); + if (csum_offload) + set_checksum_offsets (b, hdr); + else + { + virtio_interface_drop_inline (vm, node_index, &bi, 1, + VIRTIO_TX_ERROR_CSUM_OFFLOAD_PACKET_DROP); + return n_added; + } } if (PREDICT_TRUE ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0)) @@ -246,7 +292,7 @@ add_buffer_to_slot (vlib_main_t * vm, virtio_if_t * vif, d->len = b->current_length + hdr_sz; d->flags = 0; } - else + else if (vif->features & VIRTIO_FEATURE (VIRTIO_RING_F_INDIRECT_DESC)) { /* * We are using single vlib_buffer_t for indirect descriptor(s) @@ -258,7 +304,11 @@ add_buffer_to_slot (vlib_main_t * vm, virtio_if_t * vif, */ u32 indirect_buffer = 0; if (PREDICT_FALSE (vlib_buffer_alloc (vm, &indirect_buffer, 1) == 0)) - return n_added; + { + virtio_interface_drop_inline (vm, node_index, &bi, 1, + VIRTIO_TX_ERROR_INDIRECT_DESC_ALLOC_FAILED); + return n_added; + } vlib_buffer_t *indirect_desc = vlib_get_buffer (vm, indirect_buffer); indirect_desc->current_data = 0; @@ -303,7 +353,7 @@ add_buffer_to_slot (vlib_main_t * vm, virtio_if_t * vif, id->len = b->current_length; } } - else /* VIRTIO_IF_TYPE_TAP */ + else /* VIRTIO_IF_TYPE_[TAP | TUN] */ { d->addr = pointer_to_uword (id); /* first buffer in chain */ @@ -326,6 +376,55 @@ add_buffer_to_slot (vlib_main_t * vm, virtio_if_t * vif, d->len = count * sizeof (struct vring_desc); d->flags = VRING_DESC_F_INDIRECT; } + else if (vif->type == VIRTIO_IF_TYPE_PCI) + { + u16 count = next; + vlib_buffer_t *b_temp = b; + u16 n_buffers_in_chain = 1; + + /* + * Check the length of the chain for the required number of + * descriptors. Return from here, retry to get more descriptors, + * if chain length is greater than available descriptors. + */ + while (b_temp->flags & VLIB_BUFFER_NEXT_PRESENT) + { + n_buffers_in_chain++; + b_temp = vlib_get_buffer (vm, b_temp->next_buffer); + } + + if (n_buffers_in_chain > free_desc_count) + return n_buffers_in_chain; + + d->addr = vlib_buffer_get_current_pa (vm, b) - hdr_sz; + d->len = b->current_length + hdr_sz; + + while (b->flags & VLIB_BUFFER_NEXT_PRESENT) + { + d->flags = VRING_DESC_F_NEXT; + vring->buffers[count] = bi; + b->flags &= + ~(VLIB_BUFFER_NEXT_PRESENT | VLIB_BUFFER_TOTAL_LENGTH_VALID); + bi = b->next_buffer; + b->next_buffer = 0; + n_added++; + count = (count + 1) & mask; + d->next = count; + d = &vring->desc[count]; + b = vlib_get_buffer (vm, bi); + d->addr = vlib_buffer_get_current_pa (vm, b); + d->len = b->current_length; + } + d->flags = 0; + vring->buffers[count] = bi; + vring->avail->ring[avail & mask] = next; + n_added++; + return n_added; + } + else + { + ASSERT (0); + } vring->buffers[next] = bi; vring->avail->ring[avail & mask] = next; n_added++; @@ -416,16 +515,25 @@ retry: { u16 n_added = 0; n_added = - add_buffer_to_slot (vm, vif, vring, buffers[0], avail, next, mask, - do_gso, csum_offload); - if (!n_added) + add_buffer_to_slot (vm, vif, vring, buffers[0], free_desc_count, + avail, next, mask, do_gso, csum_offload, + node->node_index); + + if (PREDICT_FALSE (n_added == 0)) + { + buffers++; + n_left--; + continue; + } + else if (PREDICT_FALSE (n_added > free_desc_count)) break; - avail += n_added; + + avail++; next = (next + n_added) & mask; used += n_added; buffers++; n_left--; - free_desc_count--; + free_desc_count -= n_added; } if (n_left != frame->n_vectors) @@ -443,9 +551,8 @@ retry: if (retry_count--) goto retry; - vlib_error_count (vm, node->node_index, VIRTIO_TX_ERROR_NO_FREE_SLOTS, - n_left); - vlib_buffer_free (vm, buffers, n_left); + virtio_interface_drop_inline (vm, node->node_index, buffers, n_left, + VIRTIO_TX_ERROR_NO_FREE_SLOTS); } clib_spinlock_unlock_if_init (&vring->lockp); @@ -567,6 +674,7 @@ VNET_DEVICE_CLASS (virtio_device_class) = { .subif_add_del_function = virtio_subif_add_del_function, .rx_mode_change_function = virtio_interface_rx_mode_change, }; + /* *INDENT-ON* */ /*