[Qemu-devel] [PATCH V2 2/6] net/net.c: Add vnet header length to SocketReadState

[Zhang Chen <zhangchen.fnst@cn.fujitsu.com>]

Address Jason Wang's comments add vnet header length to SocketReadState.
So we change net_fill_rstate() to read
struct  {int size; int vnet_hdr_len; const uint8_t buf[];}.

Signed-off-by: Zhang Chen <zhangchen.fnst@cn.fujitsu.com>
---
 include/net/net.h |  4 +++-
 net/net.c         | 24 ++++++++++++++++++++++--
 2 files changed, 25 insertions(+), 3 deletions(-)

diff --git a/include/net/net.h b/include/net/net.h
index 99b28d5..1204fe5 100644
--- a/include/net/net.h
+++ b/include/net/net.h
@@ -111,9 +111,11 @@ typedef struct NICState {
 } NICState;
 
 struct SocketReadState {
-    int state; /* 0 = getting length, 1 = getting data */
+    /* 0 = getting length, 1 = getting vnet header length, 2 = getting data */
+    int state;
     uint32_t index;
     uint32_t packet_len;
+    uint32_t vnet_hdr_len;
     uint8_t buf[NET_BUFSIZE];
     SocketReadStateFinalize *finalize;
 };
diff --git a/net/net.c b/net/net.c
index 0ac3b9e..d467452 100644
--- a/net/net.c
+++ b/net/net.c
@@ -1621,8 +1621,12 @@ int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size)
     unsigned int l;
 
     while (size > 0) {
-        /* reassemble a packet from the network */
-        switch (rs->state) { /* 0 = getting length, 1 = getting data */
+        /* Reassemble a packet from the network.
+         * 0 = getting length.
+         * 1 = getting vnet header length.
+         * 2 = getting data.
+         */
+        switch (rs->state) {
         case 0:
             l = 4 - rs->index;
             if (l > size) {
@@ -1640,6 +1644,22 @@ int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size)
             }
             break;
         case 1:
+            l = 4 - rs->index;
+            if (l > size) {
+                l = size;
+            }
+            memcpy(rs->buf + rs->index, buf, l);
+            buf += l;
+            size -= l;
+            rs->index += l;
+            if (rs->index == 4) {
+                /* got vnet header length */
+                rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf);
+                rs->index = 0;
+                rs->state = 2;
+            }
+            break;
+        case 2:
             l = rs->packet_len - rs->index;
             if (l > size) {
                 l = size;
-- 
2.7.4