Intel Wired LAN drivers: Use static const
[pandora-kernel.git] / drivers / net / ixgbe / ixgbe_ethtool.c
index 3dc731c..90a740d 100644 (file)
@@ -185,6 +185,16 @@ static int ixgbe_get_settings(struct net_device *netdev,
                                             ADVERTISED_FIBRE);
                        ecmd->port = PORT_FIBRE;
                        ecmd->autoneg = AUTONEG_DISABLE;
+               } else if ((hw->device_id == IXGBE_DEV_ID_82599_COMBO_BACKPLANE) ||
+                          (hw->device_id == IXGBE_DEV_ID_82599_KX4_MEZZ)) {
+                       ecmd->supported |= (SUPPORTED_1000baseT_Full |
+                                           SUPPORTED_Autoneg |
+                                           SUPPORTED_FIBRE);
+                       ecmd->advertising = (ADVERTISED_10000baseT_Full |
+                                            ADVERTISED_1000baseT_Full |
+                                            ADVERTISED_Autoneg |
+                                            ADVERTISED_FIBRE);
+                       ecmd->port = PORT_FIBRE;
                } else {
                        ecmd->supported |= (SUPPORTED_1000baseT_Full |
                                            SUPPORTED_FIBRE);
@@ -204,6 +214,7 @@ static int ixgbe_get_settings(struct net_device *netdev,
        /* Get PHY type */
        switch (adapter->hw.phy.type) {
        case ixgbe_phy_tn:
+       case ixgbe_phy_aq:
        case ixgbe_phy_cu_unknown:
                /* Copper 10G-BASET */
                ecmd->port = PORT_TP;
@@ -332,13 +343,6 @@ static void ixgbe_get_pauseparam(struct net_device *netdev,
        else
                pause->autoneg = 1;
 
-#ifdef CONFIG_DCB
-       if (hw->fc.current_mode == ixgbe_fc_pfc) {
-               pause->rx_pause = 0;
-               pause->tx_pause = 0;
-       }
-
-#endif
        if (hw->fc.current_mode == ixgbe_fc_rx_pause) {
                pause->rx_pause = 1;
        } else if (hw->fc.current_mode == ixgbe_fc_tx_pause) {
@@ -346,6 +350,11 @@ static void ixgbe_get_pauseparam(struct net_device *netdev,
        } else if (hw->fc.current_mode == ixgbe_fc_full) {
                pause->rx_pause = 1;
                pause->tx_pause = 1;
+#ifdef CONFIG_DCB
+       } else if (hw->fc.current_mode == ixgbe_fc_pfc) {
+               pause->rx_pause = 0;
+               pause->tx_pause = 0;
+#endif
        }
 }
 
@@ -363,7 +372,6 @@ static int ixgbe_set_pauseparam(struct net_device *netdev,
                return -EINVAL;
 
 #endif
-
        fc = hw->fc;
 
        if (pause->autoneg != AUTONEG_ENABLE)
@@ -412,11 +420,6 @@ static int ixgbe_set_rx_csum(struct net_device *netdev, u32 data)
        else
                adapter->flags &= ~IXGBE_FLAG_RX_CSUM_ENABLED;
 
-       if (netif_running(netdev))
-               ixgbe_reinit_locked(adapter);
-       else
-               ixgbe_reset(adapter);
-
        return 0;
 }
 
@@ -428,16 +431,21 @@ static u32 ixgbe_get_tx_csum(struct net_device *netdev)
 static int ixgbe_set_tx_csum(struct net_device *netdev, u32 data)
 {
        struct ixgbe_adapter *adapter = netdev_priv(netdev);
+       u32 feature_list;
 
-       if (data) {
-               netdev->features |= (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM);
-               if (adapter->hw.mac.type == ixgbe_mac_82599EB)
-                       netdev->features |= NETIF_F_SCTP_CSUM;
-       } else {
-               netdev->features &= ~(NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM);
-               if (adapter->hw.mac.type == ixgbe_mac_82599EB)
-                       netdev->features &= ~NETIF_F_SCTP_CSUM;
+       feature_list = (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM);
+       switch (adapter->hw.mac.type) {
+       case ixgbe_mac_82599EB:
+       case ixgbe_mac_X540:
+               feature_list |= NETIF_F_SCTP_CSUM;
+               break;
+       default:
+               break;
        }
+       if (data)
+               netdev->features |= feature_list;
+       else
+               netdev->features &= ~feature_list;
 
        return 0;
 }
@@ -530,10 +538,20 @@ static void ixgbe_get_regs(struct net_device *netdev,
        regs_buff[32] = IXGBE_READ_REG(hw, IXGBE_FCTTV(1));
        regs_buff[33] = IXGBE_READ_REG(hw, IXGBE_FCTTV(2));
        regs_buff[34] = IXGBE_READ_REG(hw, IXGBE_FCTTV(3));
-       for (i = 0; i < 8; i++)
-               regs_buff[35 + i] = IXGBE_READ_REG(hw, IXGBE_FCRTL(i));
-       for (i = 0; i < 8; i++)
-               regs_buff[43 + i] = IXGBE_READ_REG(hw, IXGBE_FCRTH(i));
+       for (i = 0; i < 8; i++) {
+               switch (hw->mac.type) {
+               case ixgbe_mac_82598EB:
+                       regs_buff[35 + i] = IXGBE_READ_REG(hw, IXGBE_FCRTL(i));
+                       regs_buff[43 + i] = IXGBE_READ_REG(hw, IXGBE_FCRTH(i));
+                       break;
+               case ixgbe_mac_82599EB:
+                       regs_buff[35 + i] = IXGBE_READ_REG(hw, IXGBE_FCRTL_82599(i));
+                       regs_buff[43 + i] = IXGBE_READ_REG(hw, IXGBE_FCRTH_82599(i));
+                       break;
+               default:
+                       break;
+               }
+       }
        regs_buff[51] = IXGBE_READ_REG(hw, IXGBE_FCRTV);
        regs_buff[52] = IXGBE_READ_REG(hw, IXGBE_TFCS);
 
@@ -615,6 +633,7 @@ static void ixgbe_get_regs(struct net_device *netdev,
        regs_buff[827] = IXGBE_READ_REG(hw, IXGBE_WUPM);
        regs_buff[828] = IXGBE_READ_REG(hw, IXGBE_FHFT(0));
 
+       /* DCB */
        regs_buff[829] = IXGBE_READ_REG(hw, IXGBE_RMCS);
        regs_buff[830] = IXGBE_READ_REG(hw, IXGBE_DPMCS);
        regs_buff[831] = IXGBE_READ_REG(hw, IXGBE_PDPMCS);
@@ -905,13 +924,11 @@ static int ixgbe_set_ringparam(struct net_device *netdev,
                        memcpy(&temp_tx_ring[i], adapter->tx_ring[i],
                               sizeof(struct ixgbe_ring));
                        temp_tx_ring[i].count = new_tx_count;
-                       err = ixgbe_setup_tx_resources(adapter,
-                                                      &temp_tx_ring[i]);
+                       err = ixgbe_setup_tx_resources(&temp_tx_ring[i]);
                        if (err) {
                                while (i) {
                                        i--;
-                                       ixgbe_free_tx_resources(adapter,
-                                                             &temp_tx_ring[i]);
+                                       ixgbe_free_tx_resources(&temp_tx_ring[i]);
                                }
                                goto clear_reset;
                        }
@@ -930,13 +947,11 @@ static int ixgbe_set_ringparam(struct net_device *netdev,
                        memcpy(&temp_rx_ring[i], adapter->rx_ring[i],
                               sizeof(struct ixgbe_ring));
                        temp_rx_ring[i].count = new_rx_count;
-                       err = ixgbe_setup_rx_resources(adapter,
-                                                      &temp_rx_ring[i]);
+                       err = ixgbe_setup_rx_resources(&temp_rx_ring[i]);
                        if (err) {
                                while (i) {
                                        i--;
-                                       ixgbe_free_rx_resources(adapter,
-                                                             &temp_rx_ring[i]);
+                                       ixgbe_free_rx_resources(&temp_rx_ring[i]);
                                }
                                goto err_setup;
                        }
@@ -951,8 +966,7 @@ static int ixgbe_set_ringparam(struct net_device *netdev,
                /* tx */
                if (new_tx_count != adapter->tx_ring_count) {
                        for (i = 0; i < adapter->num_tx_queues; i++) {
-                               ixgbe_free_tx_resources(adapter,
-                                                       adapter->tx_ring[i]);
+                               ixgbe_free_tx_resources(adapter->tx_ring[i]);
                                memcpy(adapter->tx_ring[i], &temp_tx_ring[i],
                                       sizeof(struct ixgbe_ring));
                        }
@@ -962,8 +976,7 @@ static int ixgbe_set_ringparam(struct net_device *netdev,
                /* rx */
                if (new_rx_count != adapter->rx_ring_count) {
                        for (i = 0; i < adapter->num_rx_queues; i++) {
-                               ixgbe_free_rx_resources(adapter,
-                                                       adapter->rx_ring[i]);
+                               ixgbe_free_rx_resources(adapter->rx_ring[i]);
                                memcpy(adapter->rx_ring[i], &temp_rx_ring[i],
                                       sizeof(struct ixgbe_ring));
                        }
@@ -1144,7 +1157,7 @@ struct ixgbe_reg_test {
 #define TABLE64_TEST_HI        6
 
 /* default 82599 register test */
-static struct ixgbe_reg_test reg_test_82599[] = {
+static const struct ixgbe_reg_test reg_test_82599[] = {
        { IXGBE_FCRTL_82599(0), 1, PATTERN_TEST, 0x8007FFF0, 0x8007FFF0 },
        { IXGBE_FCRTH_82599(0), 1, PATTERN_TEST, 0x8007FFF0, 0x8007FFF0 },
        { IXGBE_PFCTOP, 1, PATTERN_TEST, 0xFFFFFFFF, 0xFFFFFFFF },
@@ -1168,7 +1181,7 @@ static struct ixgbe_reg_test reg_test_82599[] = {
 };
 
 /* default 82598 register test */
-static struct ixgbe_reg_test reg_test_82598[] = {
+static const struct ixgbe_reg_test reg_test_82598[] = {
        { IXGBE_FCRTL(0), 1, PATTERN_TEST, 0x8007FFF0, 0x8007FFF0 },
        { IXGBE_FCRTH(0), 1, PATTERN_TEST, 0x8007FFF0, 0x8007FFF0 },
        { IXGBE_PFCTOP, 1, PATTERN_TEST, 0xFFFFFFFF, 0xFFFFFFFF },
@@ -1195,18 +1208,22 @@ static struct ixgbe_reg_test reg_test_82598[] = {
        { 0, 0, 0, 0 }
 };
 
+static const u32 register_test_patterns[] = {
+       0x5A5A5A5A, 0xA5A5A5A5, 0x00000000, 0xFFFFFFFF
+};
+
 #define REG_PATTERN_TEST(R, M, W)                                             \
 {                                                                             \
        u32 pat, val, before;                                                 \
-       const u32 _test[] = {0x5A5A5A5A, 0xA5A5A5A5, 0x00000000, 0xFFFFFFFF}; \
-       for (pat = 0; pat < ARRAY_SIZE(_test); pat++) {                       \
+       for (pat = 0; pat < ARRAY_SIZE(register_test_patterns); pat++) {      \
                before = readl(adapter->hw.hw_addr + R);                      \
-               writel((_test[pat] & W), (adapter->hw.hw_addr + R));          \
+               writel((register_test_patterns[pat] & W),                     \
+                      (adapter->hw.hw_addr + R));                            \
                val = readl(adapter->hw.hw_addr + R);                         \
-               if (val != (_test[pat] & W & M)) {                            \
-                       e_err(drv, "pattern test reg %04X failed: got "   \
-                             "0x%08X expected 0x%08X\n",                     \
-                             R, val, (_test[pat] & W & M));                \
+               if (val != (register_test_patterns[pat] & W & M)) {           \
+                       e_err(drv, "pattern test reg %04X failed: got "       \
+                             "0x%08X expected 0x%08X\n",                     \
+                             R, val, (register_test_patterns[pat] & W & M)); \
                        *data = R;                                            \
                        writel(before, adapter->hw.hw_addr + R);              \
                        return 1;                                             \
@@ -1233,16 +1250,24 @@ static struct ixgbe_reg_test reg_test_82598[] = {
 
 static int ixgbe_reg_test(struct ixgbe_adapter *adapter, u64 *data)
 {
-       struct ixgbe_reg_test *test;
+       const struct ixgbe_reg_test *test;
        u32 value, before, after;
        u32 i, toggle;
 
-       if (adapter->hw.mac.type == ixgbe_mac_82599EB) {
-               toggle = 0x7FFFF30F;
-               test = reg_test_82599;
-       } else {
+       switch (adapter->hw.mac.type) {
+       case ixgbe_mac_82598EB:
                toggle = 0x7FFFF3FF;
                test = reg_test_82598;
+               break;
+       case ixgbe_mac_82599EB:
+       case ixgbe_mac_X540:
+               toggle = 0x7FFFF30F;
+               test = reg_test_82599;
+               break;
+       default:
+               *data = 1;
+               return 1;
+               break;
        }
 
        /*
@@ -1460,16 +1485,21 @@ static void ixgbe_free_desc_rings(struct ixgbe_adapter *adapter)
        reg_ctl &= ~IXGBE_TXDCTL_ENABLE;
        IXGBE_WRITE_REG(hw, IXGBE_TXDCTL(tx_ring->reg_idx), reg_ctl);
 
-       if (hw->mac.type == ixgbe_mac_82599EB) {
+       switch (hw->mac.type) {
+       case ixgbe_mac_82599EB:
+       case ixgbe_mac_X540:
                reg_ctl = IXGBE_READ_REG(hw, IXGBE_DMATXCTL);
                reg_ctl &= ~IXGBE_DMATXCTL_TE;
                IXGBE_WRITE_REG(hw, IXGBE_DMATXCTL, reg_ctl);
+               break;
+       default:
+               break;
        }
 
        ixgbe_reset(adapter);
 
-       ixgbe_free_tx_resources(adapter, &adapter->test_tx_ring);
-       ixgbe_free_rx_resources(adapter, &adapter->test_rx_ring);
+       ixgbe_free_tx_resources(&adapter->test_tx_ring);
+       ixgbe_free_rx_resources(&adapter->test_rx_ring);
 }
 
 static int ixgbe_setup_desc_rings(struct ixgbe_adapter *adapter)
@@ -1483,17 +1513,24 @@ static int ixgbe_setup_desc_rings(struct ixgbe_adapter *adapter)
        /* Setup Tx descriptor ring and Tx buffers */
        tx_ring->count = IXGBE_DEFAULT_TXD;
        tx_ring->queue_index = 0;
+       tx_ring->dev = &adapter->pdev->dev;
+       tx_ring->netdev = adapter->netdev;
        tx_ring->reg_idx = adapter->tx_ring[0]->reg_idx;
        tx_ring->numa_node = adapter->node;
 
-       err = ixgbe_setup_tx_resources(adapter, tx_ring);
+       err = ixgbe_setup_tx_resources(tx_ring);
        if (err)
                return 1;
 
-       if (adapter->hw.mac.type == ixgbe_mac_82599EB) {
+       switch (adapter->hw.mac.type) {
+       case ixgbe_mac_82599EB:
+       case ixgbe_mac_X540:
                reg_data = IXGBE_READ_REG(&adapter->hw, IXGBE_DMATXCTL);
                reg_data |= IXGBE_DMATXCTL_TE;
                IXGBE_WRITE_REG(&adapter->hw, IXGBE_DMATXCTL, reg_data);
+               break;
+       default:
+               break;
        }
 
        ixgbe_configure_tx_ring(adapter, tx_ring);
@@ -1501,11 +1538,13 @@ static int ixgbe_setup_desc_rings(struct ixgbe_adapter *adapter)
        /* Setup Rx Descriptor ring and Rx buffers */
        rx_ring->count = IXGBE_DEFAULT_RXD;
        rx_ring->queue_index = 0;
+       rx_ring->dev = &adapter->pdev->dev;
+       rx_ring->netdev = adapter->netdev;
        rx_ring->reg_idx = adapter->rx_ring[0]->reg_idx;
        rx_ring->rx_buf_len = IXGBE_RXBUFFER_2048;
        rx_ring->numa_node = adapter->node;
 
-       err = ixgbe_setup_rx_resources(adapter, rx_ring);
+       err = ixgbe_setup_rx_resources(rx_ring);
        if (err) {
                ret_val = 4;
                goto err_nomem;
@@ -1604,8 +1643,7 @@ static int ixgbe_check_lbtest_frame(struct sk_buff *skb,
        return 13;
 }
 
-static u16 ixgbe_clean_test_rings(struct ixgbe_adapter *adapter,
-                                  struct ixgbe_ring *rx_ring,
+static u16 ixgbe_clean_test_rings(struct ixgbe_ring *rx_ring,
                                   struct ixgbe_ring *tx_ring,
                                   unsigned int size)
 {
@@ -1627,7 +1665,7 @@ static u16 ixgbe_clean_test_rings(struct ixgbe_adapter *adapter,
                rx_buffer_info = &rx_ring->rx_buffer_info[rx_ntc];
 
                /* unmap Rx buffer, will be remapped by alloc_rx_buffers */
-               dma_unmap_single(&adapter->pdev->dev,
+               dma_unmap_single(rx_ring->dev,
                                 rx_buffer_info->dma,
                                 bufsz,
                                 DMA_FROM_DEVICE);
@@ -1639,7 +1677,7 @@ static u16 ixgbe_clean_test_rings(struct ixgbe_adapter *adapter,
 
                /* unmap buffer on Tx side */
                tx_buffer_info = &tx_ring->tx_buffer_info[tx_ntc];
-               ixgbe_unmap_and_free_tx_resource(adapter, tx_buffer_info);
+               ixgbe_unmap_and_free_tx_resource(tx_ring, tx_buffer_info);
 
                /* increment Rx/Tx next to clean counters */
                rx_ntc++;
@@ -1655,7 +1693,7 @@ static u16 ixgbe_clean_test_rings(struct ixgbe_adapter *adapter,
        }
 
        /* re-map buffers to ring, store next to clean values */
-       ixgbe_alloc_rx_buffers(adapter, rx_ring, count);
+       ixgbe_alloc_rx_buffers(rx_ring, count);
        rx_ring->next_to_clean = rx_ntc;
        tx_ring->next_to_clean = tx_ntc;
 
@@ -1699,7 +1737,6 @@ static int ixgbe_run_loopback_test(struct ixgbe_adapter *adapter)
                for (i = 0; i < 64; i++) {
                        skb_get(skb);
                        tx_ret_val = ixgbe_xmit_frame_ring(skb,
-                                                          adapter->netdev,
                                                           adapter,
                                                           tx_ring);
                        if (tx_ret_val == NETDEV_TX_OK)
@@ -1714,8 +1751,7 @@ static int ixgbe_run_loopback_test(struct ixgbe_adapter *adapter)
                /* allow 200 milliseconds for packets to go from Tx to Rx */
                msleep(200);
 
-               good_cnt = ixgbe_clean_test_rings(adapter, rx_ring,
-                                                 tx_ring, size);
+               good_cnt = ixgbe_clean_test_rings(rx_ring, tx_ring, size);
                if (good_cnt != 64) {
                        ret_val = 13;
                        break;
@@ -1847,7 +1883,25 @@ static int ixgbe_wol_exclusion(struct ixgbe_adapter *adapter,
        struct ixgbe_hw *hw = &adapter->hw;
        int retval = 1;
 
+       /* WOL not supported except for the following */
        switch(hw->device_id) {
+       case IXGBE_DEV_ID_82599_SFP:
+               /* Only this subdevice supports WOL */
+               if (hw->subsystem_device_id != IXGBE_SUBDEV_ID_82599_SFP) {
+                       wol->supported = 0;
+                       break;
+               }
+               retval = 0;
+               break;
+       case IXGBE_DEV_ID_82599_COMBO_BACKPLANE:
+               /* All except this subdevice support WOL */
+               if (hw->subsystem_device_id ==
+                   IXGBE_SUBDEV_ID_82599_KX4_KR_MEZZ) {
+                       wol->supported = 0;
+                       break;
+               }
+               retval = 0;
+               break;
        case IXGBE_DEV_ID_82599_KX4:
                retval = 0;
                break;
@@ -1985,6 +2039,41 @@ static int ixgbe_get_coalesce(struct net_device *netdev,
        return 0;
 }
 
+/*
+ * this function must be called before setting the new value of
+ * rx_itr_setting
+ */
+static bool ixgbe_update_rsc(struct ixgbe_adapter *adapter,
+                            struct ethtool_coalesce *ec)
+{
+       struct net_device *netdev = adapter->netdev;
+
+       if (!(adapter->flags2 & IXGBE_FLAG2_RSC_CAPABLE))
+               return false;
+
+       /* if interrupt rate is too high then disable RSC */
+       if (ec->rx_coalesce_usecs != 1 &&
+           ec->rx_coalesce_usecs <= 1000000/IXGBE_MAX_RSC_INT_RATE) {
+               if (adapter->flags2 & IXGBE_FLAG2_RSC_ENABLED) {
+                       e_info(probe, "rx-usecs set too low, "
+                                     "disabling RSC\n");
+                       adapter->flags2 &= ~IXGBE_FLAG2_RSC_ENABLED;
+                       return true;
+               }
+       } else {
+               /* check the feature flag value and enable RSC if necessary */
+               if ((netdev->features & NETIF_F_LRO) &&
+                   !(adapter->flags2 & IXGBE_FLAG2_RSC_ENABLED)) {
+                       e_info(probe, "rx-usecs set to %d, "
+                                     "re-enabling RSC\n",
+                              ec->rx_coalesce_usecs);
+                       adapter->flags2 |= IXGBE_FLAG2_RSC_ENABLED;
+                       return true;
+               }
+       }
+       return false;
+}
+
 static int ixgbe_set_coalesce(struct net_device *netdev,
                               struct ethtool_coalesce *ec)
 {
@@ -2002,17 +2091,14 @@ static int ixgbe_set_coalesce(struct net_device *netdev,
                adapter->tx_ring[0]->work_limit = ec->tx_max_coalesced_frames_irq;
 
        if (ec->rx_coalesce_usecs > 1) {
-               u32 max_int;
-               if (adapter->flags2 & IXGBE_FLAG2_RSC_ENABLED)
-                       max_int = IXGBE_MAX_RSC_INT_RATE;
-               else
-                       max_int = IXGBE_MAX_INT_RATE;
-
                /* check the limits */
-               if ((1000000/ec->rx_coalesce_usecs > max_int) ||
+               if ((1000000/ec->rx_coalesce_usecs > IXGBE_MAX_INT_RATE) ||
                    (1000000/ec->rx_coalesce_usecs < IXGBE_MIN_INT_RATE))
                        return -EINVAL;
 
+               /* check the old value and enable RSC if necessary */
+               need_reset = ixgbe_update_rsc(adapter, ec);
+
                /* store the value in ints/second */
                adapter->rx_eitr_param = 1000000/ec->rx_coalesce_usecs;
 
@@ -2021,32 +2107,21 @@ static int ixgbe_set_coalesce(struct net_device *netdev,
                /* clear the lower bit as its used for dynamic state */
                adapter->rx_itr_setting &= ~1;
        } else if (ec->rx_coalesce_usecs == 1) {
+               /* check the old value and enable RSC if necessary */
+               need_reset = ixgbe_update_rsc(adapter, ec);
+
                /* 1 means dynamic mode */
                adapter->rx_eitr_param = 20000;
                adapter->rx_itr_setting = 1;
        } else {
+               /* check the old value and enable RSC if necessary */
+               need_reset = ixgbe_update_rsc(adapter, ec);
                /*
                 * any other value means disable eitr, which is best
                 * served by setting the interrupt rate very high
                 */
                adapter->rx_eitr_param = IXGBE_MAX_INT_RATE;
                adapter->rx_itr_setting = 0;
-
-               /*
-                * if hardware RSC is enabled, disable it when
-                * setting low latency mode, to avoid errata, assuming
-                * that when the user set low latency mode they want
-                * it at the cost of anything else
-                */
-               if (adapter->flags2 & IXGBE_FLAG2_RSC_ENABLED) {
-                       adapter->flags2 &= ~IXGBE_FLAG2_RSC_ENABLED;
-                       if (netdev->features & NETIF_F_LRO) {
-                               netdev->features &= ~NETIF_F_LRO;
-                               e_info(probe, "rx-usecs set to 0, "
-                                      "disabling RSC\n");
-                       }
-                       need_reset = true;
-               }
        }
 
        if (ec->tx_coalesce_usecs > 1) {
@@ -2133,28 +2208,39 @@ static int ixgbe_set_flags(struct net_device *netdev, u32 data)
                return rc;
 
        /* if state changes we need to update adapter->flags and reset */
-       if (adapter->flags2 & IXGBE_FLAG2_RSC_CAPABLE) {
-               /*
-                * cast both to bool and verify if they are set the same
-                * but only enable RSC if itr is non-zero, as
-                * itr=0 and RSC are mutually exclusive
-                */
-               if (((!!(data & ETH_FLAG_LRO)) !=
-                    (!!(adapter->flags2 & IXGBE_FLAG2_RSC_ENABLED))) &&
-                   adapter->rx_itr_setting) {
+       if ((adapter->flags2 & IXGBE_FLAG2_RSC_CAPABLE) &&
+           (!!(data & ETH_FLAG_LRO) !=
+            !!(adapter->flags2 & IXGBE_FLAG2_RSC_ENABLED))) {
+               if ((data & ETH_FLAG_LRO) &&
+                   (!adapter->rx_itr_setting ||
+                    (adapter->rx_itr_setting > IXGBE_MAX_RSC_INT_RATE))) {
+                       e_info(probe, "rx-usecs set too low, "
+                                     "not enabling RSC.\n");
+               } else {
                        adapter->flags2 ^= IXGBE_FLAG2_RSC_ENABLED;
                        switch (adapter->hw.mac.type) {
                        case ixgbe_mac_82599EB:
                                need_reset = true;
                                break;
+                       case ixgbe_mac_X540: {
+                               int i;
+                               for (i = 0; i < adapter->num_rx_queues; i++) {
+                                       struct ixgbe_ring *ring =
+                                                         adapter->rx_ring[i];
+                                       if (adapter->flags2 &
+                                           IXGBE_FLAG2_RSC_ENABLED) {
+                                               ixgbe_configure_rscctl(adapter,
+                                                                      ring);
+                                       } else {
+                                               ixgbe_clear_rscctl(adapter,
+                                                                  ring);
+                                       }
+                               }
+                       }
+                               break;
                        default:
                                break;
                        }
-               } else if (!adapter->rx_itr_setting) {
-                       netdev->features &= ~NETIF_F_LRO;
-                       if (data & ETH_FLAG_LRO)
-                               e_info(probe, "rx-usecs set to 0, "
-                                      "LRO/RSC cannot be enabled.\n");
                }
        }