opencores_eth cleanups:

- use mii.h
 - reduce stack usage in open_eth_start_xmit.
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Merge remote-tracking branch 'remotes/xtensa/tags/20160523-opencores_eth' into staging

opencores_eth cleanups:
- use mii.h
- reduce stack usage in open_eth_start_xmit.

# gpg: Signature made Mon 23 May 2016 20:14:20 BST using RSA key ID F83FA044
# gpg: Good signature from "Max Filippov <max.filippov@cogentembedded.com>"
# gpg:                 aka "Max Filippov <jcmvbkbc@gmail.com>"

* remotes/xtensa/tags/20160523-opencores_eth:
  hw/net/opencores_eth: Allocating Large sized arrays to heap
  hw/net/opencores_eth: use mii.h

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

hw/net/opencores_eth.c

@@ -33,6 +33,7 @@
 
 #include "qemu/osdep.h"
 #include "hw/hw.h"
+#include "hw/net/mii.h"
 #include "hw/sysbus.h"
 #include "net/net.h"
 #include "sysemu/sysemu.h"
@@ -55,12 +56,6 @@
 
 /* PHY MII registers */
 enum {
-    MII_BMCR,
-    MII_BMSR,
-    MII_PHYIDR1,
-    MII_PHYIDR2,
-    MII_ANAR,
-    MII_ANLPAR,
     MII_REG_MAX = 16,
 };
 
@@ -72,10 +67,11 @@ typedef struct Mii {
 static void mii_set_link(Mii *s, bool link_ok)
 {
     if (link_ok) {
-        s->regs[MII_BMSR] |= 0x4;
-        s->regs[MII_ANLPAR] |= 0x01e1;
+        s->regs[MII_BMSR] |= MII_BMSR_LINK_ST;
+        s->regs[MII_ANLPAR] |= MII_ANLPAR_TXFD | MII_ANLPAR_TX |
+            MII_ANLPAR_10FD | MII_ANLPAR_10 | MII_ANLPAR_CSMACD;
     } else {
-        s->regs[MII_BMSR] &= ~0x4;
+        s->regs[MII_BMSR] &= ~MII_BMSR_LINK_ST;
         s->regs[MII_ANLPAR] &= 0x01ff;
     }
     s->link_ok = link_ok;
@@ -84,11 +80,14 @@ static void mii_set_link(Mii *s, bool link_ok)
 static void mii_reset(Mii *s)
 {
     memset(s->regs, 0, sizeof(s->regs));
-    s->regs[MII_BMCR] = 0x1000;
-    s->regs[MII_BMSR] = 0x7868; /* no ext regs */
-    s->regs[MII_PHYIDR1] = 0x2000;
-    s->regs[MII_PHYIDR2] = 0x5c90;
-    s->regs[MII_ANAR] = 0x01e1;
+    s->regs[MII_BMCR] = MII_BMCR_AUTOEN;
+    s->regs[MII_BMSR] = MII_BMSR_100TX_FD | MII_BMSR_100TX_HD |
+        MII_BMSR_10T_FD | MII_BMSR_10T_HD | MII_BMSR_MFPS |
+        MII_BMSR_AN_COMP | MII_BMSR_AUTONEG;
+    s->regs[MII_PHYID1] = 0x2000;
+    s->regs[MII_PHYID2] = 0x5c90;
+    s->regs[MII_ANAR] = MII_ANAR_TXFD | MII_ANAR_TX |
+        MII_ANAR_10FD | MII_ANAR_10 | MII_ANAR_CSMACD;
     mii_set_link(s, s->link_ok);
 }
 
@@ -98,7 +97,7 @@ static void mii_ro(Mii *s, uint16_t v)
 
 static void mii_write_bmcr(Mii *s, uint16_t v)
 {
-    if (v & 0x8000) {
+    if (v & MII_BMCR_RESET) {
         mii_reset(s);
     } else {
         s->regs[MII_BMCR] = v;
@@ -110,8 +109,8 @@ static void mii_write_host(Mii *s, unsigned idx, uint16_t v)
     static void (*reg_write[MII_REG_MAX])(Mii *s, uint16_t v) = {
         [MII_BMCR] = mii_write_bmcr,
         [MII_BMSR] = mii_ro,
-        [MII_PHYIDR1] = mii_ro,
-        [MII_PHYIDR2] = mii_ro,
+        [MII_PHYID1] = mii_ro,
+        [MII_PHYID2] = mii_ro,
     };
 
     if (idx < MII_REG_MAX) {
@@ -483,7 +482,8 @@ static NetClientInfo net_open_eth_info = {
 
 static void open_eth_start_xmit(OpenEthState *s, desc *tx)
 {
-    uint8_t buf[65536];
+    uint8_t *buf = NULL;
+    uint8_t buffer[0x600];
     unsigned len = GET_FIELD(tx->len_flags, TXD_LEN);
     unsigned tx_len = len;
 
@@ -498,6 +498,11 @@ static void open_eth_start_xmit(OpenEthState *s, desc *tx)
 
     trace_open_eth_start_xmit(tx->buf_ptr, len, tx_len);
 
+    if (tx_len > sizeof(buffer)) {
+        buf = g_new(uint8_t, tx_len);
+    } else {
+        buf = buffer;
+    }
     if (len > tx_len) {
         len = tx_len;
     }
@@ -506,6 +511,9 @@ static void open_eth_start_xmit(OpenEthState *s, desc *tx)
         memset(buf + len, 0, tx_len - len);
     }
     qemu_send_packet(qemu_get_queue(s->nic), buf, tx_len);
+    if (tx_len > sizeof(buffer)) {
+        g_free(buf);
+    }
 
     if (tx->len_flags & TXD_WR) {
         s->tx_desc = 0;