From b9ad513e187669db8f5ac238028f6bf25a17c641 Mon Sep 17 00:00:00 2001
From: Akihiko Odaki <akihiko.odaki@daynix.com>
Date: Sun, 28 Apr 2024 16:00:47 +0900
Subject: [PATCH] net: Remove receive_raw()

While netmap implements virtio-net header, it does not implement
receive_raw(). Instead of implementing receive_raw for netmap, add
virtio-net headers in the common code and use receive_iov()/receive()
instead. This also fixes the buffer size for the virtio-net header.

Fixes: fbbdbddec0 ("tap: allow extended virtio header with hash info")
Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 include/net/net.h |  1 -
 net/net.c         | 18 ++++++++++++------
 net/tap.c         |  1 -
 3 files changed, 12 insertions(+), 8 deletions(-)

diff --git a/include/net/net.h b/include/net/net.h
index 6fe5a0aee8..c8f679761b 100644
--- a/include/net/net.h
+++ b/include/net/net.h
@@ -72,7 +72,6 @@ typedef struct NetClientInfo {
     NetClientDriver type;
     size_t size;
     NetReceive *receive;
-    NetReceive *receive_raw;
     NetReceiveIOV *receive_iov;
     NetCanReceive *can_receive;
     NetStart *start;
diff --git a/net/net.c b/net/net.c
index db096765f4..6938da05e0 100644
--- a/net/net.c
+++ b/net/net.c
@@ -787,11 +787,7 @@ static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov,
         offset = iov_to_buf(iov, iovcnt, 0, buf, offset);
     }
 
-    if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) {
-        ret = nc->info->receive_raw(nc, buffer, offset);
-    } else {
-        ret = nc->info->receive(nc, buffer, offset);
-    }
+    ret = nc->info->receive(nc, buffer, offset);
 
     g_free(buf);
     return ret;
@@ -806,6 +802,8 @@ static ssize_t qemu_deliver_packet_iov(NetClientState *sender,
     MemReentrancyGuard *owned_reentrancy_guard;
     NetClientState *nc = opaque;
     int ret;
+    struct virtio_net_hdr_v1_hash vnet_hdr = { };
+    g_autofree struct iovec *iov_copy = NULL;
 
 
     if (nc->link_down) {
@@ -824,7 +822,15 @@ static ssize_t qemu_deliver_packet_iov(NetClientState *sender,
         owned_reentrancy_guard->engaged_in_io = true;
     }
 
-    if (nc->info->receive_iov && !(flags & QEMU_NET_PACKET_FLAG_RAW)) {
+    if ((flags & QEMU_NET_PACKET_FLAG_RAW) && nc->vnet_hdr_len) {
+        iov_copy = g_new(struct iovec, iovcnt + 1);
+        iov_copy[0].iov_base = &vnet_hdr;
+        iov_copy[0].iov_len =  nc->vnet_hdr_len;
+        memcpy(&iov_copy[1], iov, iovcnt * sizeof(*iov));
+        iov = iov_copy;
+    }
+
+    if (nc->info->receive_iov) {
         ret = nc->info->receive_iov(nc, iov, iovcnt);
     } else {
         ret = nc_sendv_compat(nc, iov, iovcnt, flags);
diff --git a/net/tap.c b/net/tap.c
index 49edf6c2b6..99c59ee468 100644
--- a/net/tap.c
+++ b/net/tap.c
@@ -360,7 +360,6 @@ static NetClientInfo net_tap_info = {
     .type = NET_CLIENT_DRIVER_TAP,
     .size = sizeof(TAPState),
     .receive = tap_receive,
-    .receive_raw = tap_receive_raw,
     .receive_iov = tap_receive_iov,
     .poll = tap_poll,
     .cleanup = tap_cleanup,