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authorMohsin Kazmi <sykazmi@cisco.com>2021-02-10 11:26:24 +0100
committerDamjan Marion <dmarion@me.com>2021-02-15 20:32:56 +0000
commit6809538e646bf86c000dc1faba60b0a4157ad898 (patch)
tree18a228b96226932381f15e44b4972636de1c7fe1 /src/vnet/devices/virtio/device.c
parent99c6dc6a7a36c0be95da9afb3ad8830b24754d4e (diff)
vlib: refactor checksum offload support
Type: refactor This patch refactors the offload flags in vlib_buffer_t. There are two main reasons behind this refactoring. First, offload flags are insufficient to represent outer and inner headers offloads. Second, room for these flags in first cacheline of vlib_buffer_t is also limited. This patch introduces a generic offload flag in first cacheline. And detailed offload flags in 2nd cacheline of the structure for performance optimization. Change-Id: Icc363a142fb9208ec7113ab5bbfc8230181f6004 Signed-off-by: Mohsin Kazmi <sykazmi@cisco.com>
Diffstat (limited to 'src/vnet/devices/virtio/device.c')
-rw-r--r--src/vnet/devices/virtio/device.c22
1 files changed, 12 insertions, 10 deletions
diff --git a/src/vnet/devices/virtio/device.c b/src/vnet/devices/virtio/device.c
index 3482336b2ad..fb996d551fa 100644
--- a/src/vnet/devices/virtio/device.c
+++ b/src/vnet/devices/virtio/device.c
@@ -282,6 +282,8 @@ static_always_inline void
set_checksum_offsets (vlib_buffer_t * b, virtio_net_hdr_v1_t * hdr,
const int is_l2)
{
+ u32 oflags = vnet_buffer2 (b)->oflags;
+
if (b->flags & VNET_BUFFER_F_IS_IP4)
{
ip4_header_t *ip4;
@@ -290,11 +292,11 @@ set_checksum_offsets (vlib_buffer_t * b, virtio_net_hdr_v1_t * hdr,
0 /* ip6 */ );
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)
+ if (oflags & VNET_BUFFER_OFFLOAD_F_TCP_CKSUM)
{
hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum);
}
- else if (b->flags & VNET_BUFFER_F_OFFLOAD_UDP_CKSUM)
+ else if (oflags & VNET_BUFFER_OFFLOAD_F_UDP_CKSUM)
{
hdr->csum_offset = STRUCT_OFFSET_OF (udp_header_t, checksum);
}
@@ -305,7 +307,7 @@ set_checksum_offsets (vlib_buffer_t * b, virtio_net_hdr_v1_t * hdr,
*/
ip4 =
(ip4_header_t *) (vlib_buffer_get_current (b) + gho.l3_hdr_offset);
- if (b->flags & VNET_BUFFER_F_OFFLOAD_IP_CKSUM)
+ if (oflags & VNET_BUFFER_OFFLOAD_F_IP_CKSUM)
ip4->checksum = ip4_header_checksum (ip4);
}
else if (b->flags & VNET_BUFFER_F_IS_IP6)
@@ -315,11 +317,11 @@ set_checksum_offsets (vlib_buffer_t * b, virtio_net_hdr_v1_t * hdr,
1 /* ip6 */ );
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)
+ if (oflags & VNET_BUFFER_OFFLOAD_F_TCP_CKSUM)
{
hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum);
}
- else if (b->flags & VNET_BUFFER_F_OFFLOAD_UDP_CKSUM)
+ else if (oflags & VNET_BUFFER_OFFLOAD_F_UDP_CKSUM)
{
hdr->csum_offset = STRUCT_OFFSET_OF (udp_header_t, checksum);
}
@@ -330,6 +332,8 @@ static_always_inline void
set_gso_offsets (vlib_buffer_t * b, virtio_net_hdr_v1_t * hdr,
const int is_l2)
{
+ u32 oflags = vnet_buffer2 (b)->oflags;
+
if (b->flags & VNET_BUFFER_F_IS_IP4)
{
ip4_header_t *ip4;
@@ -348,7 +352,7 @@ set_gso_offsets (vlib_buffer_t * b, virtio_net_hdr_v1_t * hdr,
* 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)
+ if (oflags & VNET_BUFFER_OFFLOAD_F_IP_CKSUM)
ip4->checksum = ip4_header_checksum (ip4);
}
else if (b->flags & VNET_BUFFER_F_IS_IP6)
@@ -392,8 +396,7 @@ add_buffer_to_slot (vlib_main_t * vm, vlib_node_runtime_t * node,
goto done;
}
}
- else if (b->flags & (VNET_BUFFER_F_OFFLOAD_TCP_CKSUM |
- VNET_BUFFER_F_OFFLOAD_UDP_CKSUM))
+ else if (b->flags & VNET_BUFFER_F_OFFLOAD)
{
if (csum_offload)
set_checksum_offsets (b, hdr, is_l2);
@@ -584,8 +587,7 @@ add_buffer_to_slot_packed (vlib_main_t * vm, vlib_node_runtime_t * node,
goto done;
}
}
- else if (b->flags & (VNET_BUFFER_F_OFFLOAD_TCP_CKSUM |
- VNET_BUFFER_F_OFFLOAD_UDP_CKSUM))
+ else if (b->flags & VNET_BUFFER_F_OFFLOAD)
{
if (csum_offload)
set_checksum_offsets (b, hdr, is_l2);