[PULL,V2,16/33] net: cadence_gem: Move tx/rx packet buffert to CadenceGEMState

diff --git a/hw/net/cadence_gem.c b/hw/net/cadence_gem.c
index 2e183b5..247a52f 100644
--- a/hw/net/cadence_gem.c
+++ b/hw/net/cadence_gem.c
@@ -928,17 +928,14 @@  static void gem_get_rx_desc(CadenceGEMState *s, int q)
  */
 static ssize_t gem_receive(NetClientState *nc, const uint8_t *buf, size_t size)
 {
-    CadenceGEMState *s;
+    CadenceGEMState *s = qemu_get_nic_opaque(nc);
     unsigned   rxbufsize, bytes_to_copy;
     unsigned   rxbuf_offset;
-    uint8_t    rxbuf[2048];
     uint8_t   *rxbuf_ptr;
     bool first_desc = true;
     int maf;
     int q = 0;
 
-    s = qemu_get_nic_opaque(nc);
-
     /* Is this destination MAC address "for us" ? */
     maf = gem_mac_address_filter(s, buf);
     if (maf == GEM_RX_REJECT) {
@@ -994,19 +991,19 @@  static ssize_t gem_receive(NetClientState *nc, const uint8_t *buf, size_t size)
     } else {
         unsigned crc_val;
 
-        if (size > sizeof(rxbuf) - sizeof(crc_val)) {
-            size = sizeof(rxbuf) - sizeof(crc_val);
+        if (size > MAX_FRAME_SIZE - sizeof(crc_val)) {
+            size = MAX_FRAME_SIZE - sizeof(crc_val);
         }
         bytes_to_copy = size;
         /* The application wants the FCS field, which QEMU does not provide.
          * We must try and calculate one.
          */
 
-        memcpy(rxbuf, buf, size);
-        memset(rxbuf + size, 0, sizeof(rxbuf) - size);
-        rxbuf_ptr = rxbuf;
-        crc_val = cpu_to_le32(crc32(0, rxbuf, MAX(size, 60)));
-        memcpy(rxbuf + size, &crc_val, sizeof(crc_val));
+        memcpy(s->rx_packet, buf, size);
+        memset(s->rx_packet + size, 0, MAX_FRAME_SIZE - size);
+        rxbuf_ptr = s->rx_packet;
+        crc_val = cpu_to_le32(crc32(0, s->rx_packet, MAX(size, 60)));
+        memcpy(s->rx_packet + size, &crc_val, sizeof(crc_val));
 
         bytes_to_copy += 4;
         size += 4;
@@ -1152,7 +1149,6 @@  static void gem_transmit(CadenceGEMState *s)
 {
     uint32_t desc[DESC_MAX_NUM_WORDS];
     hwaddr packet_desc_addr;
-    uint8_t     tx_packet[2048];
     uint8_t     *p;
     unsigned    total_bytes;
     int q = 0;
@@ -1168,7 +1164,7 @@  static void gem_transmit(CadenceGEMState *s)
      * Packets scattered across multiple descriptors are gathered to this
      * one contiguous buffer first.
      */
-    p = tx_packet;
+    p = s->tx_packet;
     total_bytes = 0;
 
     for (q = s->num_priority_queues - 1; q >= 0; q--) {
@@ -1198,12 +1194,12 @@  static void gem_transmit(CadenceGEMState *s)
                 break;
             }
 
-            if (tx_desc_get_length(desc) > sizeof(tx_packet) -
-                                               (p - tx_packet)) {
+            if (tx_desc_get_length(desc) > MAX_FRAME_SIZE -
+                                               (p - s->tx_packet)) {
                 DB_PRINT("TX descriptor @ 0x%" HWADDR_PRIx \
                          " too large: size 0x%x space 0x%zx\n",
                          packet_desc_addr, tx_desc_get_length(desc),
-                         sizeof(tx_packet) - (p - tx_packet));
+                         MAX_FRAME_SIZE - (p - s->tx_packet));
                 break;
             }
 
@@ -1248,24 +1244,24 @@  static void gem_transmit(CadenceGEMState *s)
 
                 /* Is checksum offload enabled? */
                 if (s->regs[GEM_DMACFG] & GEM_DMACFG_TXCSUM_OFFL) {
-                    net_checksum_calculate(tx_packet, total_bytes);
+                    net_checksum_calculate(s->tx_packet, total_bytes);
                 }
 
                 /* Update MAC statistics */
-                gem_transmit_updatestats(s, tx_packet, total_bytes);
+                gem_transmit_updatestats(s, s->tx_packet, total_bytes);
 
                 /* Send the packet somewhere */
                 if (s->phy_loop || (s->regs[GEM_NWCTRL] &
                                     GEM_NWCTRL_LOCALLOOP)) {
-                    gem_receive(qemu_get_queue(s->nic), tx_packet,
+                    gem_receive(qemu_get_queue(s->nic), s->tx_packet,
                                 total_bytes);
                 } else {
-                    qemu_send_packet(qemu_get_queue(s->nic), tx_packet,
+                    qemu_send_packet(qemu_get_queue(s->nic), s->tx_packet,
                                      total_bytes);
                 }
 
                 /* Prepare for next packet */
-                p = tx_packet;
+                p = s->tx_packet;
                 total_bytes = 0;
             }
 
diff --git a/include/hw/net/cadence_gem.h b/include/hw/net/cadence_gem.h
index 5c83036..eddac70 100644
--- a/include/hw/net/cadence_gem.h
+++ b/include/hw/net/cadence_gem.h
@@ -40,6 +40,8 @@ 
 #define MAX_TYPE1_SCREENERS             16
 #define MAX_TYPE2_SCREENERS             16
 
+#define MAX_FRAME_SIZE 2048
+
 typedef struct CadenceGEMState {
     /*< private >*/
     SysBusDevice parent_obj;
@@ -80,6 +82,8 @@  typedef struct CadenceGEMState {
 
     uint8_t can_rx_state; /* Debug only */
 
+    uint8_t tx_packet[MAX_FRAME_SIZE];
+    uint8_t rx_packet[MAX_FRAME_SIZE];
     uint32_t rx_desc[MAX_PRIORITY_QUEUES][DESC_MAX_NUM_WORDS];
 
     bool sar_active[4];