net/vmxnet3: replenish ring buffers in Rx

vmxnet3 Rx processing should replenish ring buffers after new buffers
are available to prevent the interface from getting stuck in a state
that no new work is processed.

Signed-off-by: David Harton <dharton@cisco.com>
Acked-by: Shrikrishna Khare <skhare@vmware.com>

diff --git a/drivers/net/vmxnet3/vmxnet3_rxtx.c b/drivers/net/vmxnet3/vmxnet3_rxtx.c
index d9cf437..9861d35 100644 (file)
--- a/drivers/net/vmxnet3/vmxnet3_rxtx.c
+++ b/drivers/net/vmxnet3/vmxnet3_rxtx.c
@@ -880,6 +880,23 @@ rcd_done:
                }
        }
 
+       if (unlikely(nb_rxd == 0)) {
+               uint32_t avail;
+               for (ring_idx = 0; ring_idx < VMXNET3_RX_CMDRING_SIZE; ring_idx++) {
+                       avail = vmxnet3_cmd_ring_desc_avail(&rxq->cmd_ring[ring_idx]);
+                       if (unlikely(avail > 0)) {
+                               /* try to alloc new buf and renew descriptors */
+                               vmxnet3_post_rx_bufs(rxq, ring_idx);
+                       }
+               }
+               if (unlikely(rxq->shared->ctrl.updateRxProd)) {
+                       for (ring_idx = 0; ring_idx < VMXNET3_RX_CMDRING_SIZE; ring_idx++) {
+                               VMXNET3_WRITE_BAR0_REG(hw, rxprod_reg[ring_idx] + (rxq->queue_id * VMXNET3_REG_ALIGN),
+                                                      rxq->cmd_ring[ring_idx].next2fill);
+                       }
+               }
+       }
+
        return nb_rx;
 }