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authorBenoît Ganne <bganne@cisco.com>2019-11-26 17:59:41 +0100
committerAndrew Yourtchenko <ayourtch@gmail.com>2020-01-02 12:54:38 +0000
commit15d7fd0fe02dbeac2337049b2c157b0f08d0282d (patch)
tree6df9efdbe126f85b7657566172eddf6a2ff6902f /src
parent222b709ad97a837b59703c64cfac317f22fa1b46 (diff)
virtio: fix checksum offload support
Checksum offload and GSO are independent. We must support checksum offload if it has been negotiated, independently of GSO. Ticket: VPPSUPP-47 Type: fix Change-Id: I8cb6dd58b61714ebb2726eb4aab0d74d49fdab99 Signed-off-by: Benoît Ganne <bganne@cisco.com>
Diffstat (limited to 'src')
-rw-r--r--src/vnet/devices/virtio/node.c31
1 files changed, 21 insertions, 10 deletions
diff --git a/src/vnet/devices/virtio/node.c b/src/vnet/devices/virtio/node.c
index e9c72ebdaa1..ba17075d48c 100644
--- a/src/vnet/devices/virtio/node.c
+++ b/src/vnet/devices/virtio/node.c
@@ -142,10 +142,12 @@ more:
}
static_always_inline void
-fill_gso_buffer_flags (vlib_buffer_t * b0, struct virtio_net_hdr_v1 *hdr)
+virtio_needs_csum (vlib_buffer_t * b0, struct virtio_net_hdr_v1 *hdr,
+ u8 * l4_proto, u8 * l4_hdr_sz)
{
- u8 l4_proto = 0;
- u8 l4_hdr_sz = 0;
+ *l4_proto = 0;
+ *l4_hdr_sz = 0;
+
if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM)
{
@@ -175,7 +177,7 @@ fill_gso_buffer_flags (vlib_buffer_t * b0, struct virtio_net_hdr_v1 *hdr)
ip4_header_t *ip4 =
(ip4_header_t *) (vlib_buffer_get_current (b0) + l2hdr_sz);
vnet_buffer (b0)->l4_hdr_offset = l2hdr_sz + ip4_header_bytes (ip4);
- l4_proto = ip4->protocol;
+ *l4_proto = ip4->protocol;
b0->flags |=
(VNET_BUFFER_F_IS_IP4 | VNET_BUFFER_F_OFFLOAD_IP_CKSUM);
b0->flags |=
@@ -189,32 +191,38 @@ fill_gso_buffer_flags (vlib_buffer_t * b0, struct virtio_net_hdr_v1 *hdr)
(ip6_header_t *) (vlib_buffer_get_current (b0) + l2hdr_sz);
vnet_buffer (b0)->l4_hdr_offset = l2hdr_sz + sizeof (ip6_header_t);
/* FIXME IPv6 EH traversal */
- l4_proto = ip6->protocol;
+ *l4_proto = ip6->protocol;
b0->flags |= (VNET_BUFFER_F_IS_IP6 |
VNET_BUFFER_F_L2_HDR_OFFSET_VALID
| VNET_BUFFER_F_L3_HDR_OFFSET_VALID |
VNET_BUFFER_F_L4_HDR_OFFSET_VALID);
}
- if (l4_proto == IP_PROTOCOL_TCP)
+ if (*l4_proto == IP_PROTOCOL_TCP)
{
b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
tcp_header_t *tcp = (tcp_header_t *) (vlib_buffer_get_current (b0) +
vnet_buffer
(b0)->l4_hdr_offset);
- l4_hdr_sz = tcp_header_bytes (tcp);
+ *l4_hdr_sz = tcp_header_bytes (tcp);
tcp->checksum = 0;
}
- else if (l4_proto == IP_PROTOCOL_UDP)
+ else if (*l4_proto == IP_PROTOCOL_UDP)
{
b0->flags |= VNET_BUFFER_F_OFFLOAD_UDP_CKSUM;
udp_header_t *udp = (udp_header_t *) (vlib_buffer_get_current (b0) +
vnet_buffer
(b0)->l4_hdr_offset);
- l4_hdr_sz = sizeof (*udp);
+ *l4_hdr_sz = sizeof (*udp);
udp->checksum = 0;
}
}
+}
+
+static_always_inline void
+fill_gso_buffer_flags (vlib_buffer_t * b0, struct virtio_net_hdr_v1 *hdr,
+ u8 l4_proto, u8 l4_hdr_sz)
+{
if (hdr->gso_type == VIRTIO_NET_HDR_GSO_TCPV4)
{
ASSERT (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM);
@@ -264,6 +272,7 @@ virtio_device_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
while (n_left && n_left_to_next)
{
+ u8 l4_proto, l4_hdr_sz;
u16 num_buffers = 1;
struct vring_used_elem *e = &vring->used->ring[last & mask];
struct virtio_net_hdr_v1 *hdr;
@@ -280,8 +289,10 @@ virtio_device_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
b0->total_length_not_including_first_buffer = 0;
b0->flags = VLIB_BUFFER_TOTAL_LENGTH_VALID;
+ virtio_needs_csum (b0, hdr, &l4_proto, &l4_hdr_sz);
+
if (gso_enabled)
- fill_gso_buffer_flags (b0, hdr);
+ fill_gso_buffer_flags (b0, hdr, l4_proto, l4_hdr_sz);
vnet_buffer (b0)->sw_if_index[VLIB_RX] = vif->sw_if_index;
vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;