From 1990550a24224e07b5520bd14f8d8c7126bebc03 Mon Sep 17 00:00:00 2001
From: Xiao Wang <jasowang@redhat.com>
Date: Wed, 25 May 2011 05:32:22 -0300
Subject: [RHEL6 qemu-kvm PATCH 002/115] rtl8139: add vlan tag extraction

RH-Author: Xiao Wang <jasowang@redhat.com>
Message-id: <20110525053222.26546.44726.stgit@dhcp-91-7.nay.redhat.com.englab.nay.redhat.com>
Patchwork-id: 25549
O-Subject: [RHEL6.2 qemu-kvm PATCH 2/3] rtl8139: add vlan tag extraction
Bugzilla: 583922
RH-Acked-by: Jes Sorensen <Jes.Sorensen@redhat.com>
RH-Acked-by: Michael S. Tsirkin <mst@redhat.com>
RH-Acked-by: Alex Williamson <alex.williamson@redhat.com>

From: Benjamin Poirier <benjamin.poirier@gmail.com>

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=583922
Brew: https://brewweb.devel.redhat.com/taskinfo?taskID=3346504
Test status: Basic testing in my local desktop.

Add support to the emulated hardware to extract vlan tags in packets
going from the network to the guest.

Signed-off-by: Benjamin Poirier <benjamin.poirier@gmail.com>
Cc: Igor V. Kovalenko <igor.v.kovalenko@gmail.com>
Cc: Jason Wang <jasowang@redhat.com>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Blue Swirl <blauwirbel@gmail.com>

--

AFAIK, extraction is optional to get vlans working. The driver
requests rx detagging but should not assume that it was done. Under
Linux, the mac layer will catch the vlan ethertype. I only added this
part for completeness (to emulate the hardware more truthfully...)
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
(cherry picked from commit 18dabfd1e0fcce17ebf069014eee3aa926707551)
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 hw/rtl8139.c |   66 ++++++++++++++++++++++++++++++++++++++++++++++------------
 1 files changed, 52 insertions(+), 14 deletions(-)

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
---
 hw/rtl8139.c |   66 +++++++++++++++++++++++++++++++++++++++++++++------------
 1 files changed, 52 insertions(+), 14 deletions(-)

diff --git a/hw/rtl8139.c b/hw/rtl8139.c
index 66fb497..101e280 100644
--- a/hw/rtl8139.c
+++ b/hw/rtl8139.c
@@ -68,6 +68,16 @@
 #define MOD2(input, size) \
     ( ( input ) & ( size - 1 )  )
 
+#define ETHER_ADDR_LEN 6
+#define ETHER_TYPE_LEN 2
+#define ETH_HLEN (ETHER_ADDR_LEN * 2 + ETHER_TYPE_LEN)
+#define ETH_P_IP    0x0800      /* Internet Protocol packet */
+#define ETH_P_8021Q 0x8100      /* 802.1Q VLAN Extended Header  */
+#define ETH_MTU     1500
+
+#define VLAN_TCI_LEN 2
+#define VLAN_HLEN (ETHER_TYPE_LEN + VLAN_TCI_LEN)
+
 #if defined (DEBUG_RTL8139)
 #  define DEBUG_PRINT(x) do { printf x ; } while (0)
 #else
@@ -805,11 +815,13 @@ static int rtl8139_can_receive(VLANClientState *nc)
 static ssize_t rtl8139_do_receive(VLANClientState *nc, const uint8_t *buf, size_t size_, int do_interrupt)
 {
     RTL8139State *s = DO_UPCAST(NICState, nc, nc)->opaque;
+    /* size is the length of the buffer passed to the driver */
     int size = size_;
+    const uint8_t *dot1q_buf = NULL;
 
     uint32_t packet_header = 0;
 
-    uint8_t buf1[60];
+    uint8_t buf1[MIN_BUF_SIZE + VLAN_HLEN];
     static const uint8_t broadcast_macaddr[6] =
         { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 
@@ -921,12 +933,15 @@ static ssize_t rtl8139_do_receive(VLANClientState *nc, const uint8_t *buf, size_
         }
     }
 
-    /* if too small buffer, then expand it */
-    if (size < MIN_BUF_SIZE) {
+    /* if too small buffer, then expand it
+     * Include some tailroom in case a vlan tag is later removed. */
+    if (size < MIN_BUF_SIZE + VLAN_HLEN) {
         memcpy(buf1, buf, size);
-        memset(buf1 + size, 0, MIN_BUF_SIZE - size);
+        memset(buf1 + size, 0, MIN_BUF_SIZE + VLAN_HLEN - size);
         buf = buf1;
-        size = MIN_BUF_SIZE;
+        if (size < MIN_BUF_SIZE) {
+            size = MIN_BUF_SIZE;
+        }
     }
 
     if (rtl8139_cp_receiver_enabled(s))
@@ -989,6 +1004,29 @@ static ssize_t rtl8139_do_receive(VLANClientState *nc, const uint8_t *buf, size_
 
         uint32_t rx_space = rxdw0 & CP_RX_BUFFER_SIZE_MASK;
 
+        /* write VLAN info to descriptor variables. */
+        if (s->CpCmd & CPlusRxVLAN && be16_to_cpup((uint16_t *)
+                &buf[ETHER_ADDR_LEN * 2]) == ETH_P_8021Q) {
+            dot1q_buf = &buf[ETHER_ADDR_LEN * 2];
+            size -= VLAN_HLEN;
+            /* if too small buffer, use the tailroom added duing expansion */
+            if (size < MIN_BUF_SIZE) {
+                size = MIN_BUF_SIZE;
+            }
+
+            rxdw1 &= ~CP_RX_VLAN_TAG_MASK;
+            /* BE + ~le_to_cpu()~ + cpu_to_le() = BE */
+            rxdw1 |= CP_RX_TAVA | le16_to_cpup((uint16_t *)
+                &dot1q_buf[ETHER_TYPE_LEN]);
+
+            DEBUG_PRINT(("RTL8139: C+ Rx mode : extracted vlan tag with tci: "
+                    "%u\n", be16_to_cpup((uint16_t *)
+                        &dot1q_buf[ETHER_TYPE_LEN])));
+        } else {
+            /* reset VLAN tag flag */
+            rxdw1 &= ~CP_RX_TAVA;
+        }
+
         /* TODO: scatter the packet over available receive ring descriptors space */
 
         if (size+4 > rx_space)
@@ -1010,7 +1048,14 @@ static ssize_t rtl8139_do_receive(VLANClientState *nc, const uint8_t *buf, size_
         target_phys_addr_t rx_addr = rtl8139_addr64(rxbufLO, rxbufHI);
 
         /* receive/copy to target memory */
-        cpu_physical_memory_write( rx_addr, buf, size );
+        if (dot1q_buf) {
+            cpu_physical_memory_write(rx_addr, buf, 2 * ETHER_ADDR_LEN);
+            cpu_physical_memory_write(rx_addr + 2 * ETHER_ADDR_LEN,
+                buf + 2 * ETHER_ADDR_LEN + VLAN_HLEN,
+                size - 2 * ETHER_ADDR_LEN);
+        } else {
+            cpu_physical_memory_write(rx_addr, buf, size);
+        }
 
         if (s->CpCmd & CPlusRxChkSum)
         {
@@ -1018,7 +1063,7 @@ static ssize_t rtl8139_do_receive(VLANClientState *nc, const uint8_t *buf, size_
         }
 
         /* write checksum */
-        val = cpu_to_le32(crc32(0, buf, size));
+        val = cpu_to_le32(crc32(0, buf, size_));
         cpu_physical_memory_write( rx_addr+size, (uint8_t *)&val, 4);
 
 /* first segment of received packet flag */
@@ -1063,9 +1108,6 @@ static ssize_t rtl8139_do_receive(VLANClientState *nc, const uint8_t *buf, size_
         rxdw0 &= ~CP_RX_BUFFER_SIZE_MASK;
         rxdw0 |= (size+4);
 
-        /* reset VLAN tag flag */
-        rxdw1 &= ~CP_RX_TAVA;
-
         /* update ring data */
         val = cpu_to_le32(rxdw0);
         cpu_physical_memory_write(cplus_rx_ring_desc,    (uint8_t *)&val, 4);
@@ -2054,10 +2096,6 @@ static int rtl8139_cplus_transmit_one(RTL8139State *s)
         {
             DEBUG_PRINT(("RTL8139: +++ C+ mode offloaded task checksum\n"));
 
-            #define ETH_P_IP	0x0800		/* Internet Protocol packet	*/
-            #define ETH_HLEN    14
-            #define ETH_MTU     1500
-
             /* ip packet header */
             ip_header *ip = NULL;
             int hlen = 0;
-- 
1.7.3.2