[02/10] net: cadence_gem: Fix the queue address update during wrap around

Commit Message

Sai Pavan Boddu May 2, 2020, 5:53 p.m. UTC

During wrap around and reset, queues are pointing to initial base
address of queue 0, irrespective of what queue we are dealing with.
Fix it by assigning proper base address every time.

Signed-off-by: Sai Pavan Boddu <[e-mail]>
---
 hw/net/cadence_gem.c | 29 +++++++++++++++++++++++++----
 1 file changed, 25 insertions(+), 4 deletions(-)

Patch

diff --git a/hw/net/cadence_gem.c b/hw/net/cadence_gem.c
index 92fcbe5..074aaa8 100644
--- a/hw/net/cadence_gem.c
+++ b/hw/net/cadence_gem.c
@@ -845,6 +845,25 @@  static int get_queue_from_screen(CadenceGEMState *s, uint8_t *rxbuf_ptr,
     return 0;
 }
 
+static uint32_t gem_get_queue_base_addr(CadenceGEMState *s, bool tx, int q)
+{
+    uint32_t base_addr = 0;
+
+    switch (q) {
+    case 0:
+        base_addr = s->regs[tx ? GEM_TXQBASE : GEM_RXQBASE];
+        break;
+    case 1 ... (MAX_PRIORITY_QUEUES - 1):
+        base_addr = s->regs[(tx ? GEM_TRANSMIT_Q1_PTR :
+                                 GEM_RECEIVE_Q1_PTR) + q - 1];
+        break;
+    default:
+        g_assert_not_reached();
+    };
+
+    return base_addr;
+}
+
 static hwaddr gem_get_desc_addr(CadenceGEMState *s, bool tx, int q)
 {
     hwaddr desc_addr = 0;
@@ -1043,7 +1062,7 @@  static ssize_t gem_receive(NetClientState *nc, const uint8_t *buf, size_t size)
         /* Next descriptor */
         if (rx_desc_get_wrap(s->rx_desc[q])) {
             DB_PRINT("wrapping RX descriptor list\n");
-            s->rx_desc_addr[q] = s->regs[GEM_RXQBASE];
+            s->rx_desc_addr[q] = gem_get_queue_base_addr(s, false, q);
         } else {
             DB_PRINT("incrementing RX descriptor list\n");
             s->rx_desc_addr[q] += 4 * gem_get_desc_len(s, true);
@@ -1199,7 +1218,8 @@  static void gem_transmit(CadenceGEMState *s)
                                     sizeof(desc_first));
                 /* Advance the hardware current descriptor past this packet */
                 if (tx_desc_get_wrap(desc)) {
-                    s->tx_desc_addr[q] = s->regs[GEM_TXQBASE];
+                    s->tx_desc_addr[q] = gem_get_queue_base_addr(s,
+                                         true, q);
                 } else {
                     s->tx_desc_addr[q] = packet_desc_addr +
                                          4 * gem_get_desc_len(s, false);
@@ -1251,7 +1271,8 @@  static void gem_transmit(CadenceGEMState *s)
                 } else {
                     packet_desc_addr = 0;
                 }
-                packet_desc_addr |= s->regs[GEM_TXQBASE];
+                packet_desc_addr |= gem_get_queue_base_addr(s,
+                                    true, q);
             } else {
                 packet_desc_addr += 4 * gem_get_desc_len(s, false);
             }
@@ -1457,7 +1478,7 @@  static void gem_write(void *opaque, hwaddr offset, uint64_t val,
         if (!(val & GEM_NWCTRL_TXENA)) {
             /* Reset to start of Q when transmit disabled. */
             for (i = 0; i < s->num_priority_queues; i++) {
-                s->tx_desc_addr[i] = s->regs[GEM_TXQBASE];
+                s->tx_desc_addr[i] = gem_get_queue_base_addr(s, true, i);
             }
         }
         if (gem_can_receive(qemu_get_queue(s->nic))) {