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/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;
}