netxen: allocate status rings dynamically

This reduces netxen_adapter footprint when rss (msi-x) is disabled.

Signed-off-by: Dhananjay Phadke <dhananjay@netxen.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 25 insertions, 1 deletions

diff --git a/drivers/net/netxen/netxen_nic_main.c b/drivers/net/netxen/netxen_nic_main.c
index bd93296be4dd..cbd47ae694ba 100644
--- a/drivers/net/netxen/netxen_nic_main.c
+++ b/drivers/net/netxen/netxen_nic_main.c
@@ -153,7 +153,24 @@ static inline void netxen_nic_enable_int(struct nx_host_sds_ring *sds_ring)
                                 adapter->legacy_intr.tgt_mask_reg, 0xfbff);
 }
 
+static int
+netxen_alloc_sds_rings(struct netxen_recv_context *recv_ctx, int count)
+{
+        int size = sizeof(struct nx_host_sds_ring) * count;
+
+        recv_ctx->sds_rings = kzalloc(size, GFP_KERNEL);
+
+        return (recv_ctx->sds_rings == NULL);
+}
+
 static void
+netxen_free_sds_rings(struct netxen_recv_context *recv_ctx)
+{
+        if (recv_ctx->sds_rings != NULL)
+                kfree(recv_ctx->sds_rings);
+}
+
+static int
 netxen_napi_add(struct netxen_adapter *adapter, struct net_device *netdev)
 {
         int ring;
@@ -165,11 +182,16 @@ netxen_napi_add(struct netxen_adapter *adapter, struct net_device *netdev)
         else
                 adapter->max_sds_rings = 1;
 
+        if (netxen_alloc_sds_rings(recv_ctx, adapter->max_sds_rings))
+                return 1;
+
         for (ring = 0; ring < adapter->max_sds_rings; ring++) {
                 sds_ring = &recv_ctx->sds_rings[ring];
                 netif_napi_add(netdev, &sds_ring->napi,
                                 netxen_nic_poll, NETXEN_NETDEV_WEIGHT);
         }
+
+        return 0;
 }
 
 static void
@@ -1028,7 +1050,8 @@ netxen_nic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 
         netdev->irq = adapter->msix_entries[0].vector;
 
-        netxen_napi_add(adapter, netdev);
+        if (netxen_napi_add(adapter, netdev))
+                goto err_out_disable_msi;
 
         init_timer(&adapter->watchdog_timer);
         adapter->watchdog_timer.function = &netxen_watchdog;
@@ -1110,6 +1133,7 @@ static void __devexit netxen_nic_remove(struct pci_dev *pdev)
                 netxen_free_adapter_offload(adapter);
 
         netxen_teardown_intr(adapter);
+        netxen_free_sds_rings(&adapter->recv_ctx);
 
         netxen_cleanup_pci_map(adapter);