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authorMohsin Kazmi <sykazmi@cisco.com>2020-04-09 22:11:29 +0200
committerDamjan Marion <dmarion@me.com>2020-04-10 12:22:29 +0000
commitf50ef40acbf8279837be7e58ec5a977401e5575c (patch)
tree136b826e48c83e01129a8cfd4ff13fea7d0bb9a5 /src/vnet/devices
parent91fd910d7d7611a28d1f85482ed5d5c3ee6a8853 (diff)
virtio: fix gso and csum offload errors handling
GSO and CSUM offloaded packets are transmitted even itf doesn't support GSO/CSUM. This patch fixes it by logging the respective errors and dropping the packets. Type: fix Change-Id: I5ab19d15ce6aa9fda515313c313a5a56c0b96837 Signed-off-by: Mohsin Kazmi <sykazmi@cisco.com>
Diffstat (limited to 'src/vnet/devices')
-rw-r--r--src/vnet/devices/virtio/device.c127
1 files changed, 82 insertions, 45 deletions
diff --git a/src/vnet/devices/virtio/device.c b/src/vnet/devices/virtio/device.c
index e812b373a89..1ee94806842 100644
--- a/src/vnet/devices/virtio/device.c
+++ b/src/vnet/devices/virtio/device.c
@@ -33,8 +33,10 @@
_(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
{
@@ -74,6 +76,15 @@ format_virtio_tx_trace (u8 * s, va_list * args)
}
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)
{
ASSERT (n_buffers <= ring_size);
@@ -148,8 +159,7 @@ 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)
{
@@ -191,10 +201,44 @@ set_checksum_offsets (vlib_main_t * vm, virtio_if_t * vif, vlib_buffer_t * b,
}
}
+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)
+ u16 mask, int do_gso, int csum_offload, uword node_index)
{
u16 n_added = 0;
int hdr_sz = vif->virtio_net_hdr_sz;
@@ -205,44 +249,28 @@ 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))
@@ -266,7 +294,11 @@ 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;
@@ -425,9 +457,15 @@ 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)
- break;
+ do_gso, csum_offload, node->node_index);
+
+ if (PREDICT_FALSE (n_added == 0))
+ {
+ buffers++;
+ n_left--;
+ continue;
+ }
+
avail += n_added;
next = (next + n_added) & mask;
used += n_added;
@@ -451,9 +489,8 @@ 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);