[dpdk-dev] [PATCH v8 0/5] add virtio offload support in us-vhost

[dpdk-dev] [PATCH v8 0/5] add virtio offload support in us-vhost

[Jijiang Liu]

Adds virtio offload support in us-vhost.
 
The patch set adds the feature negotiation of checksum and TSO between
  us-vhost and vanilla Linux virtio guest, and add these offload features
  support in the vhost lib, and change vhost sample to test them.

In short, this patch set supports the followings,
 
- DPDK vhost CSUM & TSO for VM2NIC case

- CSUM and TSO support between legacy virtio-net and DPDK vhost for
  VM2VM and NIC2VM cases.

v8 changes:
  Add release notes update.

v7 changes:
  Rebase latest codes and format patch comments.
 
v6 change:
  Rebase latest codes.

v5 changes:
  Add more clear descriptions to explain these changes.
  reset the 'virtio_net_hdr' value in the virtio_enqueue_offload() function.
  reorganize patches. 
  
 
v4 changes:
  remove virtio-net change, only keep vhost changes.
  add guest TX offload capabilities to support VM to VM case.
  split the cleanup code as a separate patch.
 
v3 change:
  rebase latest codes.
 
v2 change:
  fill virtio device information for TX offloads.

Tested-by: Qian Xu <qian.q.xu@intel.com>

---
Jijiang Liu (4):
  add vhost offload capabilities
  remove ipv4_hdr structure from vhost sample.
  add guest offload setting ln the vhost lib.
  change vhost application to test checksum and TSO for VM to NIC case

 examples/vhost/main.c         |  120 ++++++++++++++++++++++++++++-----
 lib/librte_vhost/vhost_rxtx.c |  150 ++++++++++++++++++++++++++++++++++++++++-
 lib/librte_vhost/virtio-net.c |    9 ++-
 3 files changed, 259 insertions(+), 20 deletions(-)

-- 
1.7.7.6

[dpdk-dev] [PATCH v8 1/5] vhost/lib: add vhost TX offload capabilities in vhost lib

[Jijiang Liu]

Add vhost TX offload (CSUM and TSO) support capabilities in vhost lib.

In order to support these features, and the following changes are added,

1. Extend 'VHOST_SUPPORTED_FEATURES' macro to add the offload features
   negotiation.

2. Dequeue TX offload: convert the fileds in virtio_net_hdr to the
   related fileds in mbuf.

Signed-off-by: Jijiang Liu <jijiang.liu@intel.com>
Acked-by: Yuanhan Liu <yuanhan.liu@intel.com>

---
 lib/librte_vhost/vhost_rxtx.c |  103 +++++++++++++++++++++++++++++++++++++++++
 lib/librte_vhost/virtio-net.c |    6 ++-
 2 files changed, 108 insertions(+), 1 deletions(-)

diff --git a/lib/librte_vhost/vhost_rxtx.c b/lib/librte_vhost/vhost_rxtx.c
index 9322ce6..47d5f85 100644
--- a/lib/librte_vhost/vhost_rxtx.c
+++ b/lib/librte_vhost/vhost_rxtx.c
@@ -37,7 +37,12 @@
 
 #include <rte_mbuf.h>
 #include <rte_memcpy.h>
+#include <rte_ether.h>
+#include <rte_ip.h>
 #include <rte_virtio_net.h>
+#include <rte_tcp.h>
+#include <rte_udp.h>
+#include <rte_sctp.h>
 
 #include "vhost-net.h"
 
@@ -568,6 +573,97 @@ rte_vhost_enqueue_burst(struct virtio_net *dev, uint16_t queue_id,
 		return virtio_dev_rx(dev, queue_id, pkts, count);
 }
 
+static void
+parse_ethernet(struct rte_mbuf *m, uint16_t *l4_proto, void **l4_hdr)
+{
+	struct ipv4_hdr *ipv4_hdr;
+	struct ipv6_hdr *ipv6_hdr;
+	void *l3_hdr = NULL;
+	struct ether_hdr *eth_hdr;
+	uint16_t ethertype;
+
+	eth_hdr = rte_pktmbuf_mtod(m, struct ether_hdr *);
+
+	m->l2_len = sizeof(struct ether_hdr);
+	ethertype = rte_be_to_cpu_16(eth_hdr->ether_type);
+
+	if (ethertype == ETHER_TYPE_VLAN) {
+		struct vlan_hdr *vlan_hdr = (struct vlan_hdr *)(eth_hdr + 1);
+
+		m->l2_len += sizeof(struct vlan_hdr);
+		ethertype = rte_be_to_cpu_16(vlan_hdr->eth_proto);
+	}
+
+	l3_hdr = (char *)eth_hdr + m->l2_len;
+
+	switch (ethertype) {
+	case ETHER_TYPE_IPv4:
+		ipv4_hdr = (struct ipv4_hdr *)l3_hdr;
+		*l4_proto = ipv4_hdr->next_proto_id;
+		m->l3_len = (ipv4_hdr->version_ihl & 0x0f) * 4;
+		*l4_hdr = (char *)l3_hdr + m->l3_len;
+		m->ol_flags |= PKT_TX_IPV4;
+		break;
+	case ETHER_TYPE_IPv6:
+		ipv6_hdr = (struct ipv6_hdr *)l3_hdr;
+		*l4_proto = ipv6_hdr->proto;
+		m->l3_len = sizeof(struct ipv6_hdr);
+		*l4_hdr = (char *)l3_hdr + m->l3_len;
+		m->ol_flags |= PKT_TX_IPV6;
+		break;
+	default:
+		m->l3_len = 0;
+		*l4_proto = 0;
+		break;
+	}
+}
+
+static inline void __attribute__((always_inline))
+vhost_dequeue_offload(struct virtio_net_hdr *hdr, struct rte_mbuf *m)
+{
+	uint16_t l4_proto = 0;
+	void *l4_hdr = NULL;
+	struct tcp_hdr *tcp_hdr = NULL;
+
+	parse_ethernet(m, &l4_proto, &l4_hdr);
+	if (hdr->flags == VIRTIO_NET_HDR_F_NEEDS_CSUM) {
+		if (hdr->csum_start == (m->l2_len + m->l3_len)) {
+			switch (hdr->csum_offset) {
+			case (offsetof(struct tcp_hdr, cksum)):
+				if (l4_proto == IPPROTO_TCP)
+					m->ol_flags |= PKT_TX_TCP_CKSUM;
+				break;
+			case (offsetof(struct udp_hdr, dgram_cksum)):
+				if (l4_proto == IPPROTO_UDP)
+					m->ol_flags |= PKT_TX_UDP_CKSUM;
+				break;
+			case (offsetof(struct sctp_hdr, cksum)):
+				if (l4_proto == IPPROTO_SCTP)
+					m->ol_flags |= PKT_TX_SCTP_CKSUM;
+				break;
+			default:
+				break;
+			}
+		}
+	}
+
+	if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
+		switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
+		case VIRTIO_NET_HDR_GSO_TCPV4:
+		case VIRTIO_NET_HDR_GSO_TCPV6:
+			tcp_hdr = (struct tcp_hdr *)l4_hdr;
+			m->ol_flags |= PKT_TX_TCP_SEG;
+			m->tso_segsz = hdr->gso_size;
+			m->l4_len = (tcp_hdr->data_off & 0xf0) >> 2;
+			break;
+		default:
+			RTE_LOG(WARNING, VHOST_DATA,
+				"unsupported gso type %u.\n", hdr->gso_type);
+			break;
+		}
+	}
+}
+
 uint16_t
 rte_vhost_dequeue_burst(struct virtio_net *dev, uint16_t queue_id,
 	struct rte_mempool *mbuf_pool, struct rte_mbuf **pkts, uint16_t count)
@@ -576,11 +672,13 @@ rte_vhost_dequeue_burst(struct virtio_net *dev, uint16_t queue_id,
 	struct vhost_virtqueue *vq;
 	struct vring_desc *desc;
 	uint64_t vb_addr = 0;
+	uint64_t vb_net_hdr_addr = 0;
 	uint32_t head[MAX_PKT_BURST];
 	uint32_t used_idx;
 	uint32_t i;
 	uint16_t free_entries, entry_success = 0;
 	uint16_t avail_idx;
+	struct virtio_net_hdr *hdr = NULL;
 
 	if (unlikely(!is_valid_virt_queue_idx(queue_id, 1, dev->virt_qp_nb))) {
 		RTE_LOG(ERR, VHOST_DATA,
@@ -632,6 +730,9 @@ rte_vhost_dequeue_burst(struct virtio_net *dev, uint16_t queue_id,
 
 		desc = &vq->desc[head[entry_success]];
 
+		vb_net_hdr_addr = gpa_to_vva(dev, desc->addr);
+		hdr = (struct virtio_net_hdr *)((uintptr_t)vb_net_hdr_addr);
+
 		/* Discard first buffer as it is the virtio header */
 		if (desc->flags & VRING_DESC_F_NEXT) {
 			desc = &vq->desc[desc->next];
@@ -770,6 +871,8 @@ rte_vhost_dequeue_burst(struct virtio_net *dev, uint16_t queue_id,
 			break;
 
 		m->nb_segs = seg_num;
+		if ((hdr->flags != 0) || (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE))
+			vhost_dequeue_offload(hdr, m);
 
 		pkts[entry_success] = m;
 		vq->last_used_idx++;
diff --git a/lib/librte_vhost/virtio-net.c b/lib/librte_vhost/virtio-net.c
index 14278de..81bd309 100644
--- a/lib/librte_vhost/virtio-net.c
+++ b/lib/librte_vhost/virtio-net.c
@@ -77,7 +77,11 @@ static struct virtio_net_config_ll *ll_root;
 				(VHOST_SUPPORTS_MQ)            | \
 				(1ULL << VIRTIO_F_VERSION_1)   | \
 				(1ULL << VHOST_F_LOG_ALL)      | \
-				(1ULL << VHOST_USER_F_PROTOCOL_FEATURES))
+				(1ULL << VHOST_USER_F_PROTOCOL_FEATURES) | \
+				(1ULL << VIRTIO_NET_F_HOST_TSO4) | \
+				(1ULL << VIRTIO_NET_F_HOST_TSO6) | \
+				(1ULL << VIRTIO_NET_F_CSUM))
+
 static uint64_t VHOST_FEATURES = VHOST_SUPPORTED_FEATURES;
 
 
-- 
1.7.7.6

[dpdk-dev] [PATCH v8 2/5] vhost/lib: add guest offload setting

[Jijiang Liu]

Add guest offload setting in vhost lib.

Virtio 1.0 spec (5.1.6.4 Processing of Incoming Packets) says:

    1. If the VIRTIO_NET_F_GUEST_CSUM feature was negotiated, the
       VIRTIO_NET_HDR_F_NEEDS_CSUM bit in flags can be set: if so,
       the packet checksum at offset csum_offset from csum_start
       and any preceding checksums have been validated. The checksum
       on the packet is incomplete and csum_start and csum_offset
       indicate how to calculate it (see Packet Transmission point 1).
    
    2. If the VIRTIO_NET_F_GUEST_TSO4, TSO6 or UFO options were
       negotiated, then gso_type MAY be something other than
       VIRTIO_NET_HDR_GSO_NONE, and gso_size field indicates the
       desired MSS (see Packet Transmission point 2).

In order to support these features, the following changes are added,
 
1. Extend 'VHOST_SUPPORTED_FEATURES' macro to add the offload features negotiation.
 
2. Enqueue these offloads: convert some fields in mbuf to the fields in virtio_net_hdr.

There are more explanations for the implementation.

For VM2VM case, there is no need to do checksum, for we think the
  data should be reliable enough, and setting VIRTIO_NET_HDR_F_NEEDS_CSUM
  at RX side will let the TCP layer to bypass the checksum validation,
  so that the RX side could receive the packet in the end.

In terms of us-vhost, at vhost RX side, the offload information is
  inherited from mbuf, which is in turn inherited from TX side. If we
  can still get those info at RX side, it means the packet is from
  another VM at same host. So, it's safe to set the
  VIRTIO_NET_HDR_F_NEEDS_CSUM, to skip checksum validation.

Signed-off-by: Jijiang Liu <jijiang.liu@intel.com>
Acked-by: Yuanhan Liu <yuanhan.liu@intel.com>

---
 lib/librte_vhost/vhost_rxtx.c |   47 +++++++++++++++++++++++++++++++++++++++-
 lib/librte_vhost/virtio-net.c |    5 +++-
 2 files changed, 49 insertions(+), 3 deletions(-)

diff --git a/lib/librte_vhost/vhost_rxtx.c b/lib/librte_vhost/vhost_rxtx.c
index 47d5f85..9d97e19 100644
--- a/lib/librte_vhost/vhost_rxtx.c
+++ b/lib/librte_vhost/vhost_rxtx.c
@@ -54,6 +54,44 @@ is_valid_virt_queue_idx(uint32_t idx, int is_tx, uint32_t qp_nb)
 	return (is_tx ^ (idx & 1)) == 0 && idx < qp_nb * VIRTIO_QNUM;
 }
 
+static void
+virtio_enqueue_offload(struct rte_mbuf *m_buf, struct virtio_net_hdr *net_hdr)
+{
+	memset(net_hdr, 0, sizeof(struct virtio_net_hdr));
+
+	if (m_buf->ol_flags & PKT_TX_L4_MASK) {
+		net_hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
+		net_hdr->csum_start = m_buf->l2_len + m_buf->l3_len;
+
+		switch (m_buf->ol_flags & PKT_TX_L4_MASK) {
+		case PKT_TX_TCP_CKSUM:
+			net_hdr->csum_offset = (offsetof(struct tcp_hdr,
+						cksum));
+			break;
+		case PKT_TX_UDP_CKSUM:
+			net_hdr->csum_offset = (offsetof(struct udp_hdr,
+						dgram_cksum));
+			break;
+		case PKT_TX_SCTP_CKSUM:
+			net_hdr->csum_offset = (offsetof(struct sctp_hdr,
+						cksum));
+			break;
+		}
+	}
+
+	if (m_buf->ol_flags & PKT_TX_TCP_SEG) {
+		if (m_buf->ol_flags & PKT_TX_IPV4)
+			net_hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
+		else
+			net_hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
+		net_hdr->gso_size = m_buf->tso_segsz;
+		net_hdr->hdr_len = m_buf->l2_len + m_buf->l3_len
+					+ m_buf->l4_len;
+	}
+
+	return;
+}
+
 /**
  * This function adds buffers to the virtio devices RX virtqueue. Buffers can
  * be received from the physical port or from another virtio device. A packet
@@ -67,7 +105,7 @@ virtio_dev_rx(struct virtio_net *dev, uint16_t queue_id,
 {
 	struct vhost_virtqueue *vq;
 	struct vring_desc *desc;
-	struct rte_mbuf *buff;
+	struct rte_mbuf *buff, *first_buff;
 	/* The virtio_hdr is initialised to 0. */
 	struct virtio_net_hdr_mrg_rxbuf virtio_hdr = {{0, 0, 0, 0, 0, 0}, 0};
 	uint64_t buff_addr = 0;
@@ -139,6 +177,7 @@ virtio_dev_rx(struct virtio_net *dev, uint16_t queue_id,
 		desc = &vq->desc[head[packet_success]];
 
 		buff = pkts[packet_success];
+		first_buff = buff;
 
 		/* Convert from gpa to vva (guest physical addr -> vhost virtual addr) */
 		buff_addr = gpa_to_vva(dev, desc->addr);
@@ -221,7 +260,9 @@ virtio_dev_rx(struct virtio_net *dev, uint16_t queue_id,
 
 		if (unlikely(uncompleted_pkt == 1))
 			continue;
-
+
+		virtio_enqueue_offload(first_buff, &virtio_hdr.hdr);
+
 		rte_memcpy((void *)(uintptr_t)buff_hdr_addr,
 			(const void *)&virtio_hdr, vq->vhost_hlen);
 
@@ -295,6 +336,8 @@ copy_from_mbuf_to_vring(struct virtio_net *dev, uint32_t queue_id,
 	LOG_DEBUG(VHOST_DATA, "(%"PRIu64") RX: Num merge buffers %d\n",
 		dev->device_fh, virtio_hdr.num_buffers);
 
+	virtio_enqueue_offload(pkt, &virtio_hdr.hdr);
+
 	rte_memcpy((void *)(uintptr_t)vb_hdr_addr,
 		(const void *)&virtio_hdr, vq->vhost_hlen);
 
diff --git a/lib/librte_vhost/virtio-net.c b/lib/librte_vhost/virtio-net.c
index 81bd309..839a333 100644
--- a/lib/librte_vhost/virtio-net.c
+++ b/lib/librte_vhost/virtio-net.c
@@ -80,7 +80,10 @@ static struct virtio_net_config_ll *ll_root;
 				(1ULL << VHOST_USER_F_PROTOCOL_FEATURES) | \
 				(1ULL << VIRTIO_NET_F_HOST_TSO4) | \
 				(1ULL << VIRTIO_NET_F_HOST_TSO6) | \
-				(1ULL << VIRTIO_NET_F_CSUM))
+				(1ULL << VIRTIO_NET_F_CSUM)    | \
+				(1ULL << VIRTIO_NET_F_GUEST_CSUM) | \
+				(1ULL << VIRTIO_NET_F_GUEST_TSO4) | \
+				(1ULL << VIRTIO_NET_F_GUEST_TSO6))
 
 static uint64_t VHOST_FEATURES = VHOST_SUPPORTED_FEATURES;
 
-- 
1.7.7.6

[dpdk-dev] [PATCH v8 3/5] sample/vhost: remove the ipv4_hdr structure defination

[Jijiang Liu]

Remove the ipv4_hdr structure defination in vhost sample.

The same structure has already defined in the rte_ip.h file, so we
  remove the defination from the sample, and include that header file.

Signed-off-by: Jijiang Liu <jijiang.liu@intel.com>
Acked-by: Yuanhan Liu <yuanhan.liu@intel.com>

---
 examples/vhost/main.c |   15 +--------------
 1 files changed, 1 insertions(+), 14 deletions(-)

diff --git a/examples/vhost/main.c b/examples/vhost/main.c
index c081b18..044c680 100644
--- a/examples/vhost/main.c
+++ b/examples/vhost/main.c
@@ -50,6 +50,7 @@
 #include <rte_string_fns.h>
 #include <rte_malloc.h>
 #include <rte_virtio_net.h>
+#include <rte_ip.h>
 
 #include "main.h"
 
@@ -292,20 +293,6 @@ struct vlan_ethhdr {
 	__be16          h_vlan_encapsulated_proto;
 };
 
-/* IPv4 Header */
-struct ipv4_hdr {
-	uint8_t  version_ihl;		/**< version and header length */
-	uint8_t  type_of_service;	/**< type of service */
-	uint16_t total_length;		/**< length of packet */
-	uint16_t packet_id;		/**< packet ID */
-	uint16_t fragment_offset;	/**< fragmentation offset */
-	uint8_t  time_to_live;		/**< time to live */
-	uint8_t  next_proto_id;		/**< protocol ID */
-	uint16_t hdr_checksum;		/**< header checksum */
-	uint32_t src_addr;		/**< source address */
-	uint32_t dst_addr;		/**< destination address */
-} __attribute__((__packed__));
-
 /* Header lengths. */
 #define VLAN_HLEN       4
 #define VLAN_ETH_HLEN   18
-- 
1.7.7.6

[dpdk-dev] [PATCH v8 4/5] example/vhost: add virtio offload test in vhost sample

[Jijiang Liu]

Change the codes in vhost sample to test virtio offload feature.

These changes include,

1. add two test options: tx-csum and tso.

2. add virtio_tx_offload() function to test vhost TX offload feature
   for VM to NIC case;

however, for VM to VM case, it doesn't need to call this function,
  the reason is explained in patch 2.
  
Signed-off-by: Jijiang Liu <jijiang.liu@intel.com>
Acked-by: Yuanhan Liu <yuanhan.liu@intel.com>

---
 examples/vhost/main.c |  105 +++++++++++++++++++++++++++++++++++++++++++++++-
 1 files changed, 102 insertions(+), 3 deletions(-)

diff --git a/examples/vhost/main.c b/examples/vhost/main.c
index 044c680..210e631 100644
--- a/examples/vhost/main.c
+++ b/examples/vhost/main.c
@@ -51,6 +51,9 @@
 #include <rte_malloc.h>
 #include <rte_virtio_net.h>
 #include <rte_ip.h>
+#include <rte_tcp.h>
+#include <rte_udp.h>
+#include <rte_sctp.h>
 
 #include "main.h"
 
@@ -198,6 +201,13 @@ typedef enum {
 static uint32_t enable_stats = 0;
 /* Enable retries on RX. */
 static uint32_t enable_retry = 1;
+
+/* Disable TX checksum offload */
+static uint32_t enable_tx_csum;
+
+/* Disable TSO offload */
+static uint32_t enable_tso;
+
 /* Specify timeout (in useconds) between retries on RX. */
 static uint32_t burst_rx_delay_time = BURST_RX_WAIT_US;
 /* Specify the number of retries on RX. */
@@ -428,6 +438,14 @@ port_init(uint8_t port)
 
 	if (port >= rte_eth_dev_count()) return -1;
 
+	if (enable_tx_csum == 0)
+		rte_vhost_feature_disable(1ULL << VIRTIO_NET_F_CSUM);
+
+	if (enable_tso == 0) {
+		rte_vhost_feature_disable(1ULL << VIRTIO_NET_F_HOST_TSO4);
+		rte_vhost_feature_disable(1ULL << VIRTIO_NET_F_HOST_TSO6);
+	}
+
 	rx_rings = (uint16_t)dev_info.max_rx_queues;
 	/* Configure ethernet device. */
 	retval = rte_eth_dev_configure(port, rx_rings, tx_rings, &port_conf);
@@ -563,7 +581,9 @@ us_vhost_usage(const char *prgname)
 	"		--rx-desc-num [0-N]: the number of descriptors on rx, "
 			"used only when zero copy is enabled.\n"
 	"		--tx-desc-num [0-N]: the number of descriptors on tx, "
-			"used only when zero copy is enabled.\n",
+			"used only when zero copy is enabled.\n"
+	"		--tx-csum [0|1] disable/enable TX checksum offload.\n"
+	"		--tso [0|1] disable/enable TCP segement offload.\n",
 	       prgname);
 }
 
@@ -589,6 +609,8 @@ us_vhost_parse_args(int argc, char **argv)
 		{"zero-copy", required_argument, NULL, 0},
 		{"rx-desc-num", required_argument, NULL, 0},
 		{"tx-desc-num", required_argument, NULL, 0},
+		{"tx-csum", required_argument, NULL, 0},
+		{"tso", required_argument, NULL, 0},
 		{NULL, 0, 0, 0},
 	};
 
@@ -643,6 +665,28 @@ us_vhost_parse_args(int argc, char **argv)
 				}
 			}
 
+			/* Enable/disable TX checksum offload. */
+			if (!strncmp(long_option[option_index].name, "tx-csum", MAX_LONG_OPT_SZ)) {
+				ret = parse_num_opt(optarg, 1);
+				if (ret == -1) {
+					RTE_LOG(INFO, VHOST_CONFIG, "Invalid argument for tx-csum [0|1]\n");
+					us_vhost_usage(prgname);
+					return -1;
+				} else
+					enable_tx_csum = ret;
+			}
+
+			/* Enable/disable TSO offload. */
+			if (!strncmp(long_option[option_index].name, "tso", MAX_LONG_OPT_SZ)) {
+				ret = parse_num_opt(optarg, 1);
+				if (ret == -1) {
+					RTE_LOG(INFO, VHOST_CONFIG, "Invalid argument for tso [0|1]\n");
+					us_vhost_usage(prgname);
+					return -1;
+				} else
+					enable_tso = ret;
+			}
+
 			/* Specify the retries delay time (in useconds) on RX. */
 			if (!strncmp(long_option[option_index].name, "rx-retry-delay", MAX_LONG_OPT_SZ)) {
 				ret = parse_num_opt(optarg, INT32_MAX);
@@ -1101,6 +1145,58 @@ find_local_dest(struct virtio_net *dev, struct rte_mbuf *m,
 	return 0;
 }
 
+static uint16_t
+get_psd_sum(void *l3_hdr, uint64_t ol_flags)
+{
+	if (ol_flags & PKT_TX_IPV4)
+		return rte_ipv4_phdr_cksum(l3_hdr, ol_flags);
+	else /* assume ethertype == ETHER_TYPE_IPv6 */
+		return rte_ipv6_phdr_cksum(l3_hdr, ol_flags);
+}
+
+static void virtio_tx_offload(struct rte_mbuf *m)
+{
+	void *l3_hdr;
+	struct ipv4_hdr *ipv4_hdr = NULL;
+	struct tcp_hdr *tcp_hdr = NULL;
+	struct udp_hdr *udp_hdr = NULL;
+	struct sctp_hdr *sctp_hdr = NULL;
+	struct ether_hdr *eth_hdr = rte_pktmbuf_mtod(m, struct ether_hdr *);
+
+	l3_hdr = (char *)eth_hdr + m->l2_len;
+
+	if (m->tso_segsz != 0) {
+		ipv4_hdr = (struct ipv4_hdr *)l3_hdr;
+		tcp_hdr = (struct tcp_hdr *)((char *)l3_hdr + m->l3_len);
+		m->ol_flags |= PKT_TX_IP_CKSUM;
+		ipv4_hdr->hdr_checksum = 0;
+		tcp_hdr->cksum = get_psd_sum(l3_hdr, m->ol_flags);
+		return;
+	}
+
+	if (m->ol_flags & PKT_TX_L4_MASK) {
+		switch (m->ol_flags & PKT_TX_L4_MASK) {
+		case PKT_TX_TCP_CKSUM:
+			tcp_hdr = (struct tcp_hdr *)
+					((char *)l3_hdr + m->l3_len);
+			tcp_hdr->cksum = get_psd_sum(l3_hdr, m->ol_flags);
+			break;
+		case PKT_TX_UDP_CKSUM:
+			udp_hdr = (struct udp_hdr *)
+					((char *)l3_hdr + m->l3_len);
+			udp_hdr->dgram_cksum = get_psd_sum(l3_hdr, m->ol_flags);
+			break;
+		case PKT_TX_SCTP_CKSUM:
+			sctp_hdr = (struct sctp_hdr *)
+					((char *)l3_hdr + m->l3_len);
+			sctp_hdr->cksum = 0;
+			break;
+		default:
+			break;
+		}
+	}
+}
+
 /*
  * This function routes the TX packet to the correct interface. This may be a local device
  * or the physical port.
@@ -1143,7 +1239,7 @@ virtio_tx_route(struct vhost_dev *vdev, struct rte_mbuf *m, uint16_t vlan_tag)
 			(vh->vlan_tci != vlan_tag_be))
 			vh->vlan_tci = vlan_tag_be;
 	} else {
-		m->ol_flags = PKT_TX_VLAN_PKT;
+		m->ol_flags |= PKT_TX_VLAN_PKT;
 
 		/*
 		 * Find the right seg to adjust the data len when offset is
@@ -1167,6 +1263,9 @@ virtio_tx_route(struct vhost_dev *vdev, struct rte_mbuf *m, uint16_t vlan_tag)
 		m->vlan_tci = vlan_tag;
 	}
 
+	if ((m->ol_flags & PKT_TX_L4_MASK) || (m->ol_flags & PKT_TX_TCP_SEG))
+		virtio_tx_offload(m);
+
 	tx_q->m_table[len] = m;
 	len++;
 	if (enable_stats) {
@@ -1828,7 +1927,7 @@ virtio_tx_route_zcp(struct virtio_net *dev, struct rte_mbuf *m,
 		mbuf->buf_physaddr = m->buf_physaddr;
 		mbuf->buf_addr = m->buf_addr;
 	}
-	mbuf->ol_flags = PKT_TX_VLAN_PKT;
+	mbuf->ol_flags |= PKT_TX_VLAN_PKT;
 	mbuf->vlan_tci = vlan_tag;
 	mbuf->l2_len = sizeof(struct ether_hdr);
 	mbuf->l3_len = sizeof(struct ipv4_hdr);
-- 
1.7.7.6

[dpdk-dev] [PATCH v8 5/5] doc/rel_notes: add virtio offload feature in new feature section

[Jijiang Liu]

Update new feature section with virtio offload feature description.

Signed-off-by: Jijiang Liu <jijiang.liu@intel.com>
---
 doc/guides/rel_notes/release_2_3.rst |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/doc/guides/rel_notes/release_2_3.rst b/doc/guides/rel_notes/release_2_3.rst
index 7945694..47d4cb0 100644
--- a/doc/guides/rel_notes/release_2_3.rst
+++ b/doc/guides/rel_notes/release_2_3.rst
@@ -39,6 +39,11 @@ This section should contain new features added in this release. Sample format:
 
   Enabled virtio 1.0 support for virtio pmd driver.
 
+* **Support virtio offload in us-vhost."
+
+  Add the feature negotiation of checksum and TSO between us-vhost and vanilla
+  Linux virtio guest, and add these offload features support in the vhost lib.
+
 
 Resolved Issues
 ---------------
-- 
1.7.7.6

Re: [dpdk-dev] [PATCH v8 0/5] add virtio offload support in us-vhost

[Thomas Monjalon]

2016-02-05 15:31, Jijiang Liu:
> Adds virtio offload support in us-vhost.
>  
> The patch set adds the feature negotiation of checksum and TSO between
>   us-vhost and vanilla Linux virtio guest, and add these offload features
>   support in the vhost lib, and change vhost sample to test them.
> 
> In short, this patch set supports the followings,
>  
> - DPDK vhost CSUM & TSO for VM2NIC case
> 
> - CSUM and TSO support between legacy virtio-net and DPDK vhost for
>   VM2VM and NIC2VM cases.

Applied, thanks

Please check how titles and release notes have been reworded.
It may help for next times.