ixgb: eliminate checkstack warnings

Really trivial fix, use kmalloc/kfree instead of stack space.
use static const instead of const to further reduce stack usage.

V2: reflect changes suggested by Joe Perches

before:
[jbrandeb@jbrandeb-mobl2 linux-2.6]$ make checkstack|grep '\[ixgb\]'
0x00000fc1 ixgb_set_multi [ixgb]:                       768
0x00001031 ixgb_set_multi [ixgb]:                       768
0x000010f2 ixgb_set_multi [ixgb]:                       768
0x061c ixgb_check_options [ixgb]:                       448
0x09c3 ixgb_check_options [ixgb]:                       448
0x0000649e ixgb_set_ringparam [ixgb]:                   192
0x0000130d ixgb_xmit_frame [ixgb]:                      184
0x000019e0 ixgb_xmit_frame [ixgb]:                      184
0x00002267 ixgb_clean [ixgb]:                           152
0x00002673 ixgb_clean [ixgb]:                           152

after:
0x000064ee ixgb_set_ringparam [ixgb]:                   192
0x0000135d ixgb_xmit_frame [ixgb]:                      184
0x00001a30 ixgb_xmit_frame [ixgb]:                      184
0x000022b7 ixgb_clean [ixgb]:                           152
0x000026c3 ixgb_clean [ixgb]:                           152

Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

7 files changed, 28 insertions, 24 deletions

diff --git a/drivers/net/ethernet/intel/ixgb/ixgb_ee.c b/drivers/net/ethernet/intel/ixgb/ixgb_ee.c
index 38b362b6785..2ed925f3881 100644
--- a/drivers/net/ethernet/intel/ixgb/ixgb_ee.c
+++ b/drivers/net/ethernet/intel/ixgb/ixgb_ee.c
@@ -559,7 +559,7 @@ ixgb_get_ee_mac_addr(struct ixgb_hw *hw,
         ENTER();
 
         if (ixgb_check_and_get_eeprom_data(hw) == true) {
-                for (i = 0; i < IXGB_ETH_LENGTH_OF_ADDRESS; i++) {
+                for (i = 0; i < ETH_ALEN; i++) {
                         mac_addr[i] = ee_map->mac_addr[i];
                 }
                 pr_debug("eeprom mac address = %pM\n", mac_addr);
diff --git a/drivers/net/ethernet/intel/ixgb/ixgb_ee.h b/drivers/net/ethernet/intel/ixgb/ixgb_ee.h
index 7ea12652f47..5680f64314b 100644
--- a/drivers/net/ethernet/intel/ixgb/ixgb_ee.h
+++ b/drivers/net/ethernet/intel/ixgb/ixgb_ee.h
@@ -31,8 +31,6 @@
 
 #define IXGB_EEPROM_SIZE    64  /* Size in words */
 
-#define IXGB_ETH_LENGTH_OF_ADDRESS   6
-
 /* EEPROM Commands */
 #define EEPROM_READ_OPCODE  0x6 /* EEPROM read opcode */
 #define EEPROM_WRITE_OPCODE 0x5 /* EEPROM write opcode */
@@ -75,7 +73,7 @@
 
 /* EEPROM structure */
 struct ixgb_ee_map_type {
-        u8 mac_addr[IXGB_ETH_LENGTH_OF_ADDRESS];
+        u8 mac_addr[ETH_ALEN];
         __le16 compatibility;
         __le16 reserved1[4];
         __le32 pba_number;
diff --git a/drivers/net/ethernet/intel/ixgb/ixgb_hw.c b/drivers/net/ethernet/intel/ixgb/ixgb_hw.c
index 3d61a9e4faf..99b69adb4a0 100644
--- a/drivers/net/ethernet/intel/ixgb/ixgb_hw.c
+++ b/drivers/net/ethernet/intel/ixgb/ixgb_hw.c
@@ -478,7 +478,7 @@ ixgb_mc_addr_list_update(struct ixgb_hw *hw,
                         ixgb_mta_set(hw, hash_value);
                 }
 
-                mca += IXGB_ETH_LENGTH_OF_ADDRESS + pad;
+                mca += ETH_ALEN + pad;
         }
 
         pr_debug("MC Update Complete\n");
diff --git a/drivers/net/ethernet/intel/ixgb/ixgb_hw.h b/drivers/net/ethernet/intel/ixgb/ixgb_hw.h
index 873d32b89fb..2a99a35c33a 100644
--- a/drivers/net/ethernet/intel/ixgb/ixgb_hw.h
+++ b/drivers/net/ethernet/intel/ixgb/ixgb_hw.h
@@ -97,8 +97,6 @@ typedef enum {
         ixgb_bus_width_64
 } ixgb_bus_width;
 
-#define IXGB_ETH_LENGTH_OF_ADDRESS   6
-
 #define IXGB_EEPROM_SIZE    64  /* Size in words */
 
 #define SPEED_10000  10000
@@ -674,7 +672,7 @@ struct ixgb_hw {
         u32 max_frame_size;     /* Maximum frame size supported     */
         u32 mc_filter_type;     /* Multicast filter hash type       */
         u32 num_mc_addrs;       /* Number of current Multicast addrs */
-        u8 curr_mac_addr[IXGB_ETH_LENGTH_OF_ADDRESS];   /* Individual address currently programmed in MAC */
+        u8 curr_mac_addr[ETH_ALEN];     /* Individual address currently programmed in MAC */
         u32 num_tx_desc;        /* Number of Transmit descriptors   */
         u32 num_rx_desc;        /* Number of Receive descriptors    */
         u32 rx_buffer_size;     /* Size of Receive buffer           */
diff --git a/drivers/net/ethernet/intel/ixgb/ixgb_main.c b/drivers/net/ethernet/intel/ixgb/ixgb_main.c
index b8fb1630459..ca3ab4a29ac 100644
--- a/drivers/net/ethernet/intel/ixgb/ixgb_main.c
+++ b/drivers/net/ethernet/intel/ixgb/ixgb_main.c
@@ -1093,7 +1093,6 @@ ixgb_set_multi(struct net_device *netdev)
         struct ixgb_hw *hw = &adapter->hw;
         struct netdev_hw_addr *ha;
         u32 rctl;
-        int i;
 
         /* Check for Promiscuous and All Multicast modes */
 
@@ -1120,19 +1119,27 @@ ixgb_set_multi(struct net_device *netdev)
                 rctl |= IXGB_RCTL_MPE;
                 IXGB_WRITE_REG(hw, RCTL, rctl);
         } else {
-                u8 mta[IXGB_MAX_NUM_MULTICAST_ADDRESSES *
-                            IXGB_ETH_LENGTH_OF_ADDRESS];
+                u8 *mta = kmalloc(IXGB_MAX_NUM_MULTICAST_ADDRESSES *
+                              ETH_ALEN, GFP_ATOMIC);
+                u8 *addr;
+                if (!mta) {
+                        pr_err("allocation of multicast memory failed\n");
+                        goto alloc_failed;
+                }
 
                 IXGB_WRITE_REG(hw, RCTL, rctl);
 
-                i = 0;
-                netdev_for_each_mc_addr(ha, netdev)
-                        memcpy(&mta[i++ * IXGB_ETH_LENGTH_OF_ADDRESS],
-                               ha->addr, IXGB_ETH_LENGTH_OF_ADDRESS);
+                addr = mta;
+                netdev_for_each_mc_addr(ha, netdev) {
+                        memcpy(addr, ha->addr, ETH_ALEN);
+                        addr += ETH_ALEN;
+                }
 
                 ixgb_mc_addr_list_update(hw, mta, netdev_mc_count(netdev), 0);
+                kfree(mta);
         }
 
+alloc_failed:
         if (netdev->features & NETIF_F_HW_VLAN_RX)
                 ixgb_vlan_strip_enable(adapter);
         else
diff --git a/drivers/net/ethernet/intel/ixgb/ixgb_osdep.h b/drivers/net/ethernet/intel/ixgb/ixgb_osdep.h
index e361185920e..8fc90519223 100644
--- a/drivers/net/ethernet/intel/ixgb/ixgb_osdep.h
+++ b/drivers/net/ethernet/intel/ixgb/ixgb_osdep.h
@@ -38,6 +38,7 @@
 #include <asm/io.h>
 #include <linux/interrupt.h>
 #include <linux/sched.h>
+#include <linux/if_ether.h>
 
 #undef ASSERT
 #define ASSERT(x)       BUG_ON(!(x))
diff --git a/drivers/net/ethernet/intel/ixgb/ixgb_param.c b/drivers/net/ethernet/intel/ixgb/ixgb_param.c
index dd7fbeb1f7d..07d83ab46e2 100644
--- a/drivers/net/ethernet/intel/ixgb/ixgb_param.c
+++ b/drivers/net/ethernet/intel/ixgb/ixgb_param.c
@@ -267,7 +267,7 @@ ixgb_check_options(struct ixgb_adapter *adapter)
         }
 
         { /* Transmit Descriptor Count */
-                const struct ixgb_option opt = {
+                static const struct ixgb_option opt = {
                         .type = range_option,
                         .name = "Transmit Descriptors",
                         .err  = "using default of " __MODULE_STRING(DEFAULT_TXD),
@@ -286,7 +286,7 @@ ixgb_check_options(struct ixgb_adapter *adapter)
                 tx_ring->count = ALIGN(tx_ring->count, IXGB_REQ_TX_DESCRIPTOR_MULTIPLE);
         }
         { /* Receive Descriptor Count */
-                const struct ixgb_option opt = {
+                static const struct ixgb_option opt = {
                         .type = range_option,
                         .name = "Receive Descriptors",
                         .err  = "using default of " __MODULE_STRING(DEFAULT_RXD),
@@ -305,7 +305,7 @@ ixgb_check_options(struct ixgb_adapter *adapter)
                 rx_ring->count = ALIGN(rx_ring->count, IXGB_REQ_RX_DESCRIPTOR_MULTIPLE);
         }
         { /* Receive Checksum Offload Enable */
-                const struct ixgb_option opt = {
+                static const struct ixgb_option opt = {
                         .type = enable_option,
                         .name = "Receive Checksum Offload",
                         .err  = "defaulting to Enabled",
@@ -348,7 +348,7 @@ ixgb_check_options(struct ixgb_adapter *adapter)
                 }
         }
         { /* Receive Flow Control High Threshold */
-                const struct ixgb_option opt = {
+                static const struct ixgb_option opt = {
                         .type = range_option,
                         .name = "Rx Flow Control High Threshold",
                         .err  = "using default of " __MODULE_STRING(DEFAULT_FCRTH),
@@ -367,7 +367,7 @@ ixgb_check_options(struct ixgb_adapter *adapter)
                         pr_info("Ignoring RxFCHighThresh when no RxFC\n");
         }
         { /* Receive Flow Control Low Threshold */
-                const struct ixgb_option opt = {
+                static const struct ixgb_option opt = {
                         .type = range_option,
                         .name = "Rx Flow Control Low Threshold",
                         .err  = "using default of " __MODULE_STRING(DEFAULT_FCRTL),
@@ -386,7 +386,7 @@ ixgb_check_options(struct ixgb_adapter *adapter)
                         pr_info("Ignoring RxFCLowThresh when no RxFC\n");
         }
         { /* Flow Control Pause Time Request*/
-                const struct ixgb_option opt = {
+                static const struct ixgb_option opt = {
                         .type = range_option,
                         .name = "Flow Control Pause Time Request",
                         .err  = "using default of "__MODULE_STRING(DEFAULT_FCPAUSE),
@@ -416,7 +416,7 @@ ixgb_check_options(struct ixgb_adapter *adapter)
                 }
         }
         { /* Receive Interrupt Delay */
-                const struct ixgb_option opt = {
+                static const struct ixgb_option opt = {
                         .type = range_option,
                         .name = "Receive Interrupt Delay",
                         .err  = "using default of " __MODULE_STRING(DEFAULT_RDTR),
@@ -433,7 +433,7 @@ ixgb_check_options(struct ixgb_adapter *adapter)
                 }
         }
         { /* Transmit Interrupt Delay */
-                const struct ixgb_option opt = {
+                static const struct ixgb_option opt = {
                         .type = range_option,
                         .name = "Transmit Interrupt Delay",
                         .err  = "using default of " __MODULE_STRING(DEFAULT_TIDV),
@@ -451,7 +451,7 @@ ixgb_check_options(struct ixgb_adapter *adapter)
         }
 
         { /* Transmit Interrupt Delay Enable */
-                const struct ixgb_option opt = {
+                static const struct ixgb_option opt = {
                         .type = enable_option,
                         .name = "Tx Interrupt Delay Enable",
                         .err  = "defaulting to Enabled",