devices: add support for offloads
Type: improvement
This patch adds support for:
1) GSO
2) checksum offload
Signed-off-by: Mohsin Kazmi <sykazmi@cisco.com>
Change-Id: Ib00629888c62da04d58db36ce021993769e736c9
diff --git a/src/vnet/devices/af_packet/FEATURE.yaml b/src/vnet/devices/af_packet/FEATURE.yaml
index 25d8b2b..4a11ea2 100644
--- a/src/vnet/devices/af_packet/FEATURE.yaml
+++ b/src/vnet/devices/af_packet/FEATURE.yaml
@@ -3,6 +3,7 @@
maintainer: Damjan Marion <damarion@cisco.com>
features:
- L4 checksum offload
+ - GSO offload
description: "Create a host interface that will attach to a linux AF_PACKET
interface, one side of a veth pair. The veth pair must
already exist. Once created, a new host interface will
diff --git a/src/vnet/devices/af_packet/af_packet.c b/src/vnet/devices/af_packet/af_packet.c
index 60eadf2..4fb5463 100644
--- a/src/vnet/devices/af_packet/af_packet.c
+++ b/src/vnet/devices/af_packet/af_packet.c
@@ -44,7 +44,7 @@
};
#define AF_PACKET_DEFAULT_TX_FRAMES_PER_BLOCK 1024
-#define AF_PACKET_DEFAULT_TX_FRAME_SIZE (2048 * 5)
+#define AF_PACKET_DEFAULT_TX_FRAME_SIZE (2048 * 33) // GSO packet of 64KB
#define AF_PACKET_TX_BLOCK_NR 1
#define AF_PACKET_DEFAULT_RX_FRAMES_PER_BLOCK 256
@@ -130,7 +130,7 @@
static int
create_packet_v3_sock (int host_if_index, tpacket_req3_t *rx_req,
tpacket_req3_t *tx_req, int *fd, u8 **ring,
- u32 *hdrlen_ptr)
+ u32 *hdrlen_ptr, u8 *is_cksum_gso_enabled)
{
af_packet_main_t *apm = &af_packet_main;
struct sockaddr_ll sll;
@@ -198,6 +198,17 @@
goto error;
}
+ int opt2 = 1;
+ if (setsockopt (*fd, SOL_PACKET, PACKET_VNET_HDR, &opt2, sizeof (opt2)) < 0)
+ {
+ vlib_log_debug (
+ apm->log_class,
+ "Failed to set packet vnet hdr error handling option: %s (errno %d)",
+ strerror (errno), errno);
+ }
+ else
+ *is_cksum_gso_enabled = 1;
+
#if defined(PACKET_QDISC_BYPASS)
/* Introduced with Linux 3.14 so the ifdef should eventually be removed */
if (setsockopt (*fd, SOL_PACKET, PACKET_QDISC_BYPASS, &opt, sizeof (opt)) <
@@ -263,6 +274,7 @@
vnet_sw_interface_t *sw;
vlib_thread_main_t *tm = vlib_get_thread_main ();
vnet_main_t *vnm = vnet_get_main ();
+ vnet_hw_if_caps_t caps = VNET_HW_IF_CAP_INT_MODE;
uword *p;
uword if_index;
u8 *host_if_name_dup = 0;
@@ -271,6 +283,7 @@
u32 rx_frame_size, tx_frame_size;
u32 hdrlen = 0;
u32 i = 0;
+ u8 is_cksum_gso_enabled = 0;
p = mhash_get (&apm->if_index_by_host_if_name, arg->host_if_name);
if (p)
@@ -365,8 +378,8 @@
fd2 = -1;
}
- ret =
- create_packet_v3_sock (host_if_index, rx_req, tx_req, &fd, &ring, &hdrlen);
+ ret = create_packet_v3_sock (host_if_index, rx_req, tx_req, &fd, &ring,
+ &hdrlen, &is_cksum_gso_enabled);
if (ret != 0)
goto error;
@@ -405,6 +418,7 @@
apif->next_rx_block = 0;
apif->mode = arg->mode;
apif->hdrlen = hdrlen;
+ apif->is_cksum_gso_enabled = is_cksum_gso_enabled;
ret = af_packet_read_mtu (apif);
if (ret != 0)
@@ -450,7 +464,11 @@
apif->queue_index = vnet_hw_if_register_rx_queue (vnm, apif->hw_if_index, 0,
VNET_HW_IF_RXQ_THREAD_ANY);
- vnet_hw_if_set_caps (vnm, apif->hw_if_index, VNET_HW_IF_CAP_INT_MODE);
+ if (apif->is_cksum_gso_enabled)
+ caps |= VNET_HW_IF_CAP_TCP_GSO | VNET_HW_IF_CAP_TX_IP4_CKSUM |
+ VNET_HW_IF_CAP_TX_TCP_CKSUM | VNET_HW_IF_CAP_TX_UDP_CKSUM;
+
+ vnet_hw_if_set_caps (vnm, apif->hw_if_index, caps);
vnet_hw_interface_set_flags (vnm, apif->hw_if_index,
VNET_HW_INTERFACE_FLAG_LINK_UP);
@@ -554,20 +572,7 @@
int
af_packet_set_l4_cksum_offload (u32 sw_if_index, u8 set)
{
- vnet_main_t *vnm = vnet_get_main ();
- vnet_hw_interface_t *hw;
- vnet_hw_if_caps_t caps =
- VNET_HW_IF_CAP_TX_TCP_CKSUM | VNET_HW_IF_CAP_TX_UDP_CKSUM;
- hw = vnet_get_sup_hw_interface (vnm, sw_if_index);
-
- if (hw->dev_class_index != af_packet_device_class.index)
- return VNET_API_ERROR_INVALID_INTERFACE;
-
- if (set)
- vnet_hw_if_set_caps (vnm, hw->hw_if_index, caps);
- else
- vnet_hw_if_unset_caps (vnm, hw->hw_if_index, caps);
-
+ // deprecated ...
return 0;
}
diff --git a/src/vnet/devices/af_packet/af_packet.h b/src/vnet/devices/af_packet/af_packet.h
index ed3f10b..dd38e1b 100644
--- a/src/vnet/devices/af_packet/af_packet.h
+++ b/src/vnet/devices/af_packet/af_packet.h
@@ -49,6 +49,7 @@
tpacket_req3_t *tx_req;
u8 **rx_ring;
u8 **tx_ring;
+ u8 is_cksum_gso_enabled;
u32 hdrlen;
u32 hw_if_index;
u32 sw_if_index;
diff --git a/src/vnet/devices/af_packet/device.c b/src/vnet/devices/af_packet/device.c
index 23b1883..1aa1e08 100644
--- a/src/vnet/devices/af_packet/device.c
+++ b/src/vnet/devices/af_packet/device.c
@@ -27,8 +27,14 @@
#include <vlib/unix/unix.h>
#include <vnet/ip/ip.h>
#include <vnet/ethernet/ethernet.h>
+#include <vnet/ip/ip4_packet.h>
+#include <vnet/ip/ip6_packet.h>
+#include <vnet/ip/ip_psh_cksum.h>
+#include <vnet/tcp/tcp_packet.h>
+#include <vnet/udp/udp_packet.h>
#include <vnet/devices/af_packet/af_packet.h>
+#include <vnet/devices/virtio/virtio_std.h>
#define foreach_af_packet_tx_func_error \
_(FRAME_NOT_READY, "tx frame not ready") \
@@ -100,7 +106,7 @@
int n_send_req = 0, n_avail = 0, n_sending = 0, n_tot = 0, n_wrong = 0;
do
{
- tph = (struct tpacket3_hdr *) (tx_block_start + tx_frame * tx_frame_sz);
+ tph = (tpacket3_hdr_t *) (tx_block_start + tx_frame * tx_frame_sz);
tx_frame = (tx_frame + 1) % tx_frame_nr;
if (tph->tp_status == 0)
n_avail++;
@@ -128,6 +134,93 @@
return s;
}
+static_always_inline void
+fill_gso_offload (vlib_buffer_t *b0, vnet_virtio_net_hdr_t *vnet_hdr)
+{
+ vnet_buffer_oflags_t oflags = vnet_buffer (b0)->oflags;
+ if (b0->flags & VNET_BUFFER_F_IS_IP4)
+ {
+ ip4_header_t *ip4;
+ vnet_hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
+ vnet_hdr->gso_size = vnet_buffer2 (b0)->gso_size;
+ vnet_hdr->hdr_len =
+ vnet_buffer (b0)->l4_hdr_offset + vnet_buffer2 (b0)->gso_l4_hdr_sz;
+ vnet_hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
+ vnet_hdr->csum_start = vnet_buffer (b0)->l4_hdr_offset; // 0x22;
+ vnet_hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum);
+ ip4 = (ip4_header_t *) (vlib_buffer_get_current (b0) +
+ vnet_buffer (b0)->l3_hdr_offset);
+ if (oflags & VNET_BUFFER_OFFLOAD_F_IP_CKSUM)
+ ip4->checksum = ip4_header_checksum (ip4);
+ }
+ else if (b0->flags & VNET_BUFFER_F_IS_IP6)
+ {
+ vnet_hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
+ vnet_hdr->gso_size = vnet_buffer2 (b0)->gso_size;
+ vnet_hdr->hdr_len =
+ vnet_buffer (b0)->l4_hdr_offset + vnet_buffer2 (b0)->gso_l4_hdr_sz;
+ vnet_hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
+ vnet_hdr->csum_start = vnet_buffer (b0)->l4_hdr_offset; // 0x36;
+ vnet_hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum);
+ }
+}
+
+static_always_inline void
+fill_cksum_offload (vlib_buffer_t *b0, vnet_virtio_net_hdr_t *vnet_hdr)
+{
+ vnet_buffer_oflags_t oflags = vnet_buffer (b0)->oflags;
+ if (b0->flags & VNET_BUFFER_F_IS_IP4)
+ {
+ ip4_header_t *ip4;
+ ip4 = (ip4_header_t *) (vlib_buffer_get_current (b0) +
+ vnet_buffer (b0)->l3_hdr_offset);
+ if (oflags & VNET_BUFFER_OFFLOAD_F_IP_CKSUM)
+ ip4->checksum = ip4_header_checksum (ip4);
+ vnet_hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
+ vnet_hdr->csum_start = 0x22;
+ if (oflags & VNET_BUFFER_OFFLOAD_F_TCP_CKSUM)
+ {
+ tcp_header_t *tcp =
+ (tcp_header_t *) (vlib_buffer_get_current (b0) +
+ vnet_buffer (b0)->l4_hdr_offset);
+ tcp->checksum = ip4_pseudo_header_cksum (ip4);
+ vnet_hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum);
+ }
+ else if (oflags & VNET_BUFFER_OFFLOAD_F_UDP_CKSUM)
+ {
+ udp_header_t *udp =
+ (udp_header_t *) (vlib_buffer_get_current (b0) +
+ vnet_buffer (b0)->l4_hdr_offset);
+ udp->checksum = ip4_pseudo_header_cksum (ip4);
+ vnet_hdr->csum_offset = STRUCT_OFFSET_OF (udp_header_t, checksum);
+ }
+ }
+ else if (b0->flags & VNET_BUFFER_F_IS_IP6)
+ {
+ ip6_header_t *ip6;
+ vnet_hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
+ vnet_hdr->csum_start = 0x36;
+ ip6 = (ip6_header_t *) (vlib_buffer_get_current (b0) +
+ vnet_buffer (b0)->l3_hdr_offset);
+ if (oflags & VNET_BUFFER_OFFLOAD_F_TCP_CKSUM)
+ {
+ tcp_header_t *tcp =
+ (tcp_header_t *) (vlib_buffer_get_current (b0) +
+ vnet_buffer (b0)->l4_hdr_offset);
+ tcp->checksum = ip6_pseudo_header_cksum (ip6);
+ vnet_hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum);
+ }
+ else if (oflags & VNET_BUFFER_OFFLOAD_F_UDP_CKSUM)
+ {
+ udp_header_t *udp =
+ (udp_header_t *) (vlib_buffer_get_current (b0) +
+ vnet_buffer (b0)->l4_hdr_offset);
+ udp->checksum = ip6_pseudo_header_cksum (ip6);
+ vnet_hdr->csum_offset = STRUCT_OFFSET_OF (udp_header_t, checksum);
+ }
+ }
+}
+
VNET_DEVICE_CLASS_TX_FN (af_packet_device_class) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame)
@@ -147,17 +240,20 @@
u32 tx_frame = apif->next_tx_frame;
tpacket3_hdr_t *tph;
u32 frame_not_ready = 0;
+ u8 is_cksum_gso_enabled = (apif->is_cksum_gso_enabled == 1) ? 1 : 0;
while (n_left)
{
u32 len;
+ vnet_virtio_net_hdr_t *vnet_hdr = 0;
u32 offset = 0;
- vlib_buffer_t *b0;
- n_left--;
+ vlib_buffer_t *b0 = 0;
u32 bi = buffers[0];
+
+ n_left--;
buffers++;
- tph = (struct tpacket3_hdr *) (block_start + tx_frame * frame_size);
+ tph = (tpacket3_hdr_t *) (block_start + tx_frame * frame_size);
if (PREDICT_FALSE (tph->tp_status &
(TP_STATUS_SEND_REQUEST | TP_STATUS_SENDING)))
{
@@ -165,17 +261,38 @@
goto next;
}
- do
+ b0 = vlib_get_buffer (vm, bi);
+
+ if (is_cksum_gso_enabled)
{
- b0 = vlib_get_buffer (vm, bi);
+ vnet_hdr =
+ (vnet_virtio_net_hdr_t *) ((u8 *) tph + TPACKET_ALIGN (sizeof (
+ tpacket3_hdr_t)));
+
+ clib_memset_u8 (vnet_hdr, 0, sizeof (vnet_virtio_net_hdr_t));
+ offset = sizeof (vnet_virtio_net_hdr_t);
+
+ if (b0->flags & VNET_BUFFER_F_GSO)
+ fill_gso_offload (b0, vnet_hdr);
+ else if (b0->flags & VNET_BUFFER_F_OFFLOAD)
+ fill_cksum_offload (b0, vnet_hdr);
+ }
+
+ len = b0->current_length;
+ clib_memcpy_fast ((u8 *) tph + TPACKET_ALIGN (sizeof (tpacket3_hdr_t)) +
+ offset,
+ vlib_buffer_get_current (b0), len);
+ offset += len;
+
+ while (b0->flags & VLIB_BUFFER_NEXT_PRESENT)
+ {
+ b0 = vlib_get_buffer (vm, b0->next_buffer);
len = b0->current_length;
- clib_memcpy_fast (
- (u8 *) tph + TPACKET_ALIGN (sizeof (struct tpacket3_hdr)) + offset,
- vlib_buffer_get_current (b0), len);
+ clib_memcpy_fast ((u8 *) tph +
+ TPACKET_ALIGN (sizeof (tpacket3_hdr_t)) + offset,
+ vlib_buffer_get_current (b0), len);
offset += len;
}
- while ((bi =
- (b0->flags & VLIB_BUFFER_NEXT_PRESENT) ? b0->next_buffer : 0));
tph->tp_len = tph->tp_snaplen = offset;
tph->tp_status = TP_STATUS_SEND_REQUEST;
diff --git a/src/vnet/devices/af_packet/node.c b/src/vnet/devices/af_packet/node.c
index 229e050..a42e3e0 100644
--- a/src/vnet/devices/af_packet/node.c
+++ b/src/vnet/devices/af_packet/node.c
@@ -28,6 +28,7 @@
#include <vnet/ethernet/packet.h>
#include <vnet/devices/af_packet/af_packet.h>
+#include <vnet/devices/virtio/virtio_std.h>
#define foreach_af_packet_input_error \
_(PARTIAL_PKT, "partial packet")
@@ -51,10 +52,11 @@
u32 next_index;
u32 hw_if_index;
int block;
- u32 num_pkts;
+ u32 pkt_num;
void *block_start;
block_desc_t bd;
tpacket3_hdr_t tph;
+ vnet_virtio_net_hdr_t vnet_hdr;
} af_packet_input_trace_t;
static u8 *
@@ -68,12 +70,10 @@
s = format (s, "af_packet: hw_if_index %d next-index %d",
t->hw_if_index, t->next_index);
- s = format (s,
- "\n%Ublock %u:\n%Uaddress %p version %u seq_num %lu"
- " num_pkts %u",
- format_white_space, indent + 2, t->block, format_white_space,
- indent + 4, t->block_start, t->bd.version, t->bd.hdr.bh1.seq_num,
- t->num_pkts);
+ s = format (
+ s, "\n%Ublock %u:\n%Uaddress %p version %u seq_num %lu pkt_num %u",
+ format_white_space, indent + 2, t->block, format_white_space, indent + 4,
+ t->block_start, t->bd.version, t->bd.hdr.bh1.seq_num, t->pkt_num);
s =
format (s,
"\n%Utpacket3_hdr:\n%Ustatus 0x%x len %u snaplen %u mac %u net %u"
@@ -91,16 +91,21 @@
t->tph.hv1.tp_vlan_tpid
#endif
);
+
+ s = format (s,
+ "\n%Uvnet-hdr:\n%Uflags 0x%02x gso_type 0x%02x hdr_len %u"
+ "\n%Ugso_size %u csum_start %u csum_offset %u",
+ format_white_space, indent + 2, format_white_space, indent + 4,
+ t->vnet_hdr.flags, t->vnet_hdr.gso_type, t->vnet_hdr.hdr_len,
+ format_white_space, indent + 4, t->vnet_hdr.gso_size,
+ t->vnet_hdr.csum_start, t->vnet_hdr.csum_offset);
return s;
}
always_inline void
-buffer_add_to_chain (vlib_main_t * vm, u32 bi, u32 first_bi, u32 prev_bi)
+buffer_add_to_chain (vlib_buffer_t *b, vlib_buffer_t *first_b,
+ vlib_buffer_t *prev_b, u32 bi)
{
- vlib_buffer_t *b = vlib_get_buffer (vm, bi);
- vlib_buffer_t *first_b = vlib_get_buffer (vm, first_bi);
- vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_bi);
-
/* update first buffer */
first_b->total_length_not_including_first_buffer += b->current_length;
@@ -109,11 +114,11 @@
prev_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
/* update current buffer */
- b->next_buffer = 0;
+ b->next_buffer = ~0;
}
static_always_inline void
-fill_gso_buffer_flags (vlib_buffer_t *b, u32 gso_size, u8 l4_hdr_sz)
+fill_gso_offload (vlib_buffer_t *b, u32 gso_size, u8 l4_hdr_sz)
{
b->flags |= VNET_BUFFER_F_GSO;
vnet_buffer2 (b)->gso_size = gso_size;
@@ -121,43 +126,66 @@
}
static_always_inline void
-mark_tcp_udp_cksum_calc (vlib_buffer_t *b, u8 *l4_hdr_sz)
+fill_cksum_offload (vlib_buffer_t *b, u8 *l4_hdr_sz, u8 is_ip)
{
- ethernet_header_t *eth = vlib_buffer_get_current (b);
vnet_buffer_oflags_t oflags = 0;
- if (clib_net_to_host_u16 (eth->type) == ETHERNET_TYPE_IP4)
+ u16 l2hdr_sz = 0;
+ u16 ethertype = 0;
+ u8 l4_proto = 0;
+
+ if (is_ip)
{
- ip4_header_t *ip4 =
- (vlib_buffer_get_current (b) + sizeof (ethernet_header_t));
- b->flags |= VNET_BUFFER_F_IS_IP4;
- if (ip4->protocol == IP_PROTOCOL_TCP)
+ switch (b->data[0] & 0xf0)
{
- oflags |= VNET_BUFFER_OFFLOAD_F_TCP_CKSUM;
- tcp_header_t *tcp = (tcp_header_t *) (vlib_buffer_get_current (b) +
- sizeof (ethernet_header_t) +
- ip4_header_bytes (ip4));
- *l4_hdr_sz = tcp_header_bytes (tcp);
+ case 0x40:
+ ethertype = ETHERNET_TYPE_IP4;
+ break;
+ case 0x60:
+ ethertype = ETHERNET_TYPE_IP6;
+ break;
}
- else if (ip4->protocol == IP_PROTOCOL_UDP)
- {
- oflags |= VNET_BUFFER_OFFLOAD_F_UDP_CKSUM;
- udp_header_t *udp = (udp_header_t *) (vlib_buffer_get_current (b) +
- sizeof (ethernet_header_t) +
- ip4_header_bytes (ip4));
- *l4_hdr_sz = sizeof (*udp);
- }
- vnet_buffer (b)->l3_hdr_offset = sizeof (ethernet_header_t);
- vnet_buffer (b)->l4_hdr_offset =
- sizeof (ethernet_header_t) + ip4_header_bytes (ip4);
- if (oflags)
- vnet_buffer_offload_flags_set (b, oflags);
}
- else if (clib_net_to_host_u16 (eth->type) == ETHERNET_TYPE_IP6)
+ else
{
- ip6_header_t *ip6 =
- (vlib_buffer_get_current (b) + sizeof (ethernet_header_t));
- b->flags |= VNET_BUFFER_F_IS_IP6;
+ ethernet_header_t *eth = vlib_buffer_get_current (b);
+ ethertype = clib_net_to_host_u16 (eth->type);
+ l2hdr_sz = sizeof (ethernet_header_t);
+ if (ethernet_frame_is_tagged (ethertype))
+ {
+ ethernet_vlan_header_t *vlan = (ethernet_vlan_header_t *) (eth + 1);
+
+ ethertype = clib_net_to_host_u16 (vlan->type);
+ l2hdr_sz += sizeof (*vlan);
+ if (ethertype == ETHERNET_TYPE_VLAN)
+ {
+ vlan++;
+ ethertype = clib_net_to_host_u16 (vlan->type);
+ l2hdr_sz += sizeof (*vlan);
+ }
+ }
+ }
+
+ vnet_buffer (b)->l2_hdr_offset = 0;
+ vnet_buffer (b)->l3_hdr_offset = l2hdr_sz;
+
+ if (ethertype == ETHERNET_TYPE_IP4)
+ {
+ ip4_header_t *ip4 = (vlib_buffer_get_current (b) + l2hdr_sz);
+ vnet_buffer (b)->l4_hdr_offset = l2hdr_sz + ip4_header_bytes (ip4);
+ b->flags |= (VNET_BUFFER_F_IS_IP4 | VNET_BUFFER_F_L2_HDR_OFFSET_VALID |
+ VNET_BUFFER_F_L3_HDR_OFFSET_VALID |
+ VNET_BUFFER_F_L4_HDR_OFFSET_VALID);
+
+ l4_proto = ip4->protocol;
+ }
+ else if (ethertype == ETHERNET_TYPE_IP6)
+ {
+ ip6_header_t *ip6 = (vlib_buffer_get_current (b) + l2hdr_sz);
+ b->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);
u16 ip6_hdr_len = sizeof (ip6_header_t);
+
if (ip6_ext_hdr (ip6->protocol))
{
ip6_ext_header_t *p = (void *) (ip6 + 1);
@@ -167,34 +195,34 @@
ip6_hdr_len += ip6_ext_header_len (p);
p = ip6_ext_next_header (p);
}
+ l4_proto = p->next_hdr;
}
- if (ip6->protocol == IP_PROTOCOL_TCP)
- {
- oflags |= VNET_BUFFER_OFFLOAD_F_TCP_CKSUM;
- tcp_header_t *tcp =
- (tcp_header_t *) (vlib_buffer_get_current (b) +
- sizeof (ethernet_header_t) + ip6_hdr_len);
- *l4_hdr_sz = tcp_header_bytes (tcp);
- }
- else if (ip6->protocol == IP_PROTOCOL_UDP)
- {
- oflags |= VNET_BUFFER_OFFLOAD_F_UDP_CKSUM;
- udp_header_t *udp =
- (udp_header_t *) (vlib_buffer_get_current (b) +
- sizeof (ethernet_header_t) + ip6_hdr_len);
- *l4_hdr_sz = sizeof (*udp);
- }
- vnet_buffer (b)->l3_hdr_offset = sizeof (ethernet_header_t);
- vnet_buffer (b)->l4_hdr_offset =
- sizeof (ethernet_header_t) + ip6_hdr_len;
- if (oflags)
- vnet_buffer_offload_flags_set (b, oflags);
+ else
+ l4_proto = ip6->protocol;
+ vnet_buffer (b)->l4_hdr_offset = l2hdr_sz + ip6_hdr_len;
}
+
+ if (l4_proto == IP_PROTOCOL_TCP)
+ {
+ oflags |= VNET_BUFFER_OFFLOAD_F_TCP_CKSUM;
+ tcp_header_t *tcp = (tcp_header_t *) (vlib_buffer_get_current (b) +
+ vnet_buffer (b)->l4_hdr_offset);
+ *l4_hdr_sz = tcp_header_bytes (tcp);
+ }
+ else if (l4_proto == IP_PROTOCOL_UDP)
+ {
+ oflags |= VNET_BUFFER_OFFLOAD_F_UDP_CKSUM;
+ *l4_hdr_sz = sizeof (udp_header_t);
+ }
+
+ if (oflags)
+ vnet_buffer_offload_flags_set (b, oflags);
}
always_inline uword
-af_packet_device_input_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
- vlib_frame_t * frame, af_packet_if_t * apif)
+af_packet_device_input_fn (vlib_main_t *vm, vlib_node_runtime_t *node,
+ vlib_frame_t *frame, af_packet_if_t *apif,
+ u8 is_cksum_gso_enabled)
{
af_packet_main_t *apm = &af_packet_main;
tpacket3_hdr_t *tph;
@@ -210,19 +238,16 @@
u32 thread_index = vm->thread_index;
u32 n_buffer_bytes = vlib_buffer_get_default_data_size (vm);
u32 min_bufs = apif->rx_req->tp_frame_size / n_buffer_bytes;
- u32 eth_header_size = 0;
u32 num_pkts = 0;
u32 rx_frame_offset = 0;
block_desc_t *bd = 0;
vlib_buffer_t bt;
+ u8 is_ip = (apif->mode == AF_PACKET_IF_MODE_IP);
- if (apif->mode == AF_PACKET_IF_MODE_IP)
- {
- next_index = VNET_DEVICE_INPUT_NEXT_IP4_INPUT;
- }
+ if (is_ip)
+ next_index = VNET_DEVICE_INPUT_NEXT_IP4_INPUT;
else
{
- eth_header_size = sizeof (ethernet_header_t);
next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
if (PREDICT_FALSE (apif->per_interface_next_index != ~0))
next_index = apif->per_interface_next_index;
@@ -257,10 +282,11 @@
while (num_pkts && (n_free_bufs > min_bufs))
{
- vlib_buffer_t *b0 = 0, *first_b0 = 0;
u32 next0 = next_index;
u32 n_left_to_next;
+
vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
+
while (num_pkts && n_left_to_next && (n_free_bufs > min_bufs))
{
tph = (tpacket3_hdr_t *) (block_start + rx_frame_offset);
@@ -269,19 +295,36 @@
CLIB_PREFETCH (block_start + rx_frame_offset +
tph->tp_next_offset,
2 * CLIB_CACHE_LINE_BYTES, LOAD);
+
+ vlib_buffer_t *b0 = 0, *first_b0 = 0, *prev_b0 = 0;
+ vnet_virtio_net_hdr_t *vnet_hdr = 0;
u32 data_len = tph->tp_snaplen;
u32 offset = 0;
- u32 bi0 = 0, first_bi0 = 0, prev_bi0;
+ u32 bi0 = ~0, first_bi0 = ~0;
u8 l4_hdr_sz = 0;
+ if (is_cksum_gso_enabled)
+ vnet_hdr =
+ (vnet_virtio_net_hdr_t *) ((u8 *) tph + tph->tp_mac -
+ sizeof (vnet_virtio_net_hdr_t));
+
+ if (PREDICT_FALSE (((data_len / n_buffer_bytes) + 1) >
+ vec_len (apm->rx_buffers[thread_index])))
+ {
+ vec_validate (apm->rx_buffers[thread_index],
+ VLIB_FRAME_SIZE + n_free_bufs - 1);
+ n_free_bufs += vlib_buffer_alloc (
+ vm, &apm->rx_buffers[thread_index][n_free_bufs],
+ VLIB_FRAME_SIZE);
+ _vec_len (apm->rx_buffers[thread_index]) = n_free_bufs;
+ }
+
while (data_len)
{
/* grab free buffer */
u32 last_empty_buffer =
vec_len (apm->rx_buffers[thread_index]) - 1;
- prev_bi0 = bi0;
bi0 = apm->rx_buffers[thread_index][last_empty_buffer];
- b0 = vlib_get_buffer (vm, bi0);
_vec_len (apm->rx_buffers[thread_index]) = last_empty_buffer;
n_free_bufs--;
@@ -290,7 +333,10 @@
data_len > n_buffer_bytes ? n_buffer_bytes : data_len;
u32 vlan_len = 0;
u32 bytes_copied = 0;
+
+ b0 = vlib_get_buffer (vm, bi0);
b0->current_data = 0;
+
/* Kernel removes VLAN headers, so reconstruct VLAN */
if (PREDICT_FALSE (tph->tp_status & TP_STATUS_VLAN_VALID))
{
@@ -328,20 +374,22 @@
vnet_buffer (b0)->sw_if_index[VLIB_RX] =
apif->sw_if_index;
vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~0;
+ first_b0 = b0;
first_bi0 = bi0;
- first_b0 = vlib_get_buffer (vm, first_bi0);
- if (tph->tp_status & TP_STATUS_CSUMNOTREADY)
- mark_tcp_udp_cksum_calc (first_b0, &l4_hdr_sz);
- /* This is a trade-off for GSO. As kernel isn't passing
- * us the GSO state or size, we guess it by comparing it
- * to the host MTU of the interface */
- if (tph->tp_snaplen > (apif->host_mtu + eth_header_size))
- fill_gso_buffer_flags (first_b0, apif->host_mtu,
- l4_hdr_sz);
+ if (is_cksum_gso_enabled)
+ {
+ if (vnet_hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM)
+ fill_cksum_offload (first_b0, &l4_hdr_sz, is_ip);
+ if (vnet_hdr->gso_type & (VIRTIO_NET_HDR_GSO_TCPV4 |
+ VIRTIO_NET_HDR_GSO_TCPV6))
+ fill_gso_offload (first_b0, vnet_hdr->gso_size,
+ l4_hdr_sz);
+ }
}
else
- buffer_add_to_chain (vm, bi0, first_bi0, prev_bi0);
+ buffer_add_to_chain (b0, first_b0, prev_b0, bi0);
+ prev_b0 = b0;
offset += bytes_to_copy;
data_len -= bytes_to_copy;
}
@@ -398,9 +446,15 @@
tr->hw_if_index = apif->hw_if_index;
tr->block = block;
tr->block_start = bd;
- tr->num_pkts = num_pkts;
+ tr->pkt_num = bd->hdr.bh1.num_pkts - num_pkts;
clib_memcpy_fast (&tr->bd, bd, sizeof (block_desc_t));
clib_memcpy_fast (&tr->tph, tph, sizeof (tpacket3_hdr_t));
+ if (is_cksum_gso_enabled)
+ clib_memcpy_fast (&tr->vnet_hdr, vnet_hdr,
+ sizeof (vnet_virtio_net_hdr_t));
+ else
+ clib_memset_u8 (&tr->vnet_hdr, 0,
+ sizeof (vnet_virtio_net_hdr_t));
}
/* enque and take next packet */
@@ -446,9 +500,15 @@
af_packet_if_t *apif;
apif = vec_elt_at_index (apm->interfaces, pv[i].dev_instance);
if (apif->is_admin_up)
- n_rx_packets += af_packet_device_input_fn (vm, node, frame, apif);
+ {
+ if (apif->is_cksum_gso_enabled)
+ n_rx_packets +=
+ af_packet_device_input_fn (vm, node, frame, apif, 1);
+ else
+ n_rx_packets +=
+ af_packet_device_input_fn (vm, node, frame, apif, 0);
+ }
}
-
return n_rx_packets;
}