Merge tag 'net-pull-request' of https://github.com/jasowang/qemu into staging

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# gpg: Signature made Tue 04 Jun 2024 02:30:22 AM CDT
# gpg:                using RSA key 215D46F48246689EC77F3562EF04965B398D6211
# gpg: Good signature from "Jason Wang (Jason Wang on RedHat) <jasowang@redhat.com>" [undefined]
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# Primary key fingerprint: 215D 46F4 8246 689E C77F  3562 EF04 965B 398D 6211

* tag 'net-pull-request' of https://github.com/jasowang/qemu:
  ebpf: Added traces back. Changed source set for eBPF to 'system'.
  virtio-net: drop too short packets early
  ebpf: Add a separate target for skeleton
  ebpf: Refactor tun_rss_steering_prog()
  ebpf: Return 0 when configuration fails
  ebpf: Fix RSS error handling
  virtio-net: Do not write hashes to peer buffer
  virtio-net: Always set populate_hash
  virtio-net: Unify the logic to update NIC state for RSS
  virtio-net: Disable RSS on reset
  virtio-net: Shrink header byte swapping buffer
  virtio-net: Copy header only when necessary
  virtio-net: Add only one queue pair when realizing
  virtio-net: Do not propagate ebpf-rss-fds errors
  tap: Shrink zeroed virtio-net header
  tap: Call tap_receive_iov() from tap_receive()
  net: Remove receive_raw()
  net: Move virtio-net header length assertion
  tap: Remove qemu_using_vnet_hdr()
  tap: Remove tap_probe_vnet_hdr_len()

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

1 files changed, 18 insertions, 29 deletions

diff --git a/net/net.c b/net/net.c
index a2f0c828bb..6938da05e0 100644
--- a/net/net.c
+++ b/net/net.c
@@ -56,6 +56,7 @@
 #include "net/filter.h"
 #include "qapi/string-output-visitor.h"
 #include "qapi/qobject-input-visitor.h"
+#include "standard-headers/linux/virtio_net.h"
 
 /* Net bridge is currently not supported for W32. */
 #if !defined(_WIN32)
@@ -529,24 +530,6 @@ bool qemu_has_vnet_hdr_len(NetClientState *nc, int len)
     return nc->info->has_vnet_hdr_len(nc, len);
 }
 
-bool qemu_get_using_vnet_hdr(NetClientState *nc)
-{
-    if (!nc || !nc->info->get_using_vnet_hdr) {
-        return false;
-    }
-
-    return nc->info->get_using_vnet_hdr(nc);
-}
-
-void qemu_using_vnet_hdr(NetClientState *nc, bool enable)
-{
-    if (!nc || !nc->info->using_vnet_hdr) {
-        return;
-    }
-
-    nc->info->using_vnet_hdr(nc, enable);
-}
-
 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6,
                           int ecn, int ufo, int uso4, int uso6)
 {
@@ -559,11 +542,7 @@ void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6,
 
 int qemu_get_vnet_hdr_len(NetClientState *nc)
 {
-    if (!nc || !nc->info->get_vnet_hdr_len) {
-        return 0;
-    }
-
-    return nc->info->get_vnet_hdr_len(nc);
+    return nc->vnet_hdr_len;
 }
 
 void qemu_set_vnet_hdr_len(NetClientState *nc, int len)
@@ -572,6 +551,10 @@ void qemu_set_vnet_hdr_len(NetClientState *nc, int len)
         return;
     }
 
+    assert(len == sizeof(struct virtio_net_hdr_mrg_rxbuf) ||
+           len == sizeof(struct virtio_net_hdr) ||
+           len == sizeof(struct virtio_net_hdr_v1_hash));
+
     nc->vnet_hdr_len = len;
     nc->info->set_vnet_hdr_len(nc, len);
 }
@@ -804,11 +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;
@@ -823,6 +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) {
@@ -841,7 +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);