bnx2x: MSI support

Enabling MSI on top of MSI-X and INTA. Also changing the module parameter to
allow choosing INTA or MSI even when MSI-X is available. The default status
block should not be reversed for endianity. Since MSI can issue
re-configuration, the interrupt disable function now requires mmiowb

Signed-off-by: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 108 insertions, 47 deletions

diff --git a/drivers/net/bnx2x_main.c b/drivers/net/bnx2x_main.c
index 60762f769efc..db8506d08fa5 100644
--- a/drivers/net/bnx2x_main.c
+++ b/drivers/net/bnx2x_main.c
@@ -77,17 +77,19 @@ static int multi_mode = 1;
 module_param(multi_mode, int, 0);
 
 static int disable_tpa;
-static int use_inta;
 static int poll;
 static int debug;
 static int load_count[3]; /* 0-common, 1-port0, 2-port1 */
 
 module_param(disable_tpa, int, 0);
-module_param(use_inta, int, 0);
+
+static int int_mode;
+module_param(int_mode, int, 0);
+MODULE_PARM_DESC(int_mode, " Force interrupt mode (1 INT#x; 2 MSI)");
+
 module_param(poll, int, 0);
 module_param(debug, int, 0);
 MODULE_PARM_DESC(disable_tpa, "disable the TPA (LRO) feature");
-MODULE_PARM_DESC(use_inta, "use INT#A instead of MSI-X");
 MODULE_PARM_DESC(poll, "use polling (for debug)");
 MODULE_PARM_DESC(debug, "default debug msglevel");
 
@@ -588,34 +590,41 @@ static void bnx2x_int_enable(struct bnx2x *bp)
         u32 addr = port ? HC_REG_CONFIG_1 : HC_REG_CONFIG_0;
         u32 val = REG_RD(bp, addr);
         int msix = (bp->flags & USING_MSIX_FLAG) ? 1 : 0;
+        int msi = (bp->flags & USING_MSI_FLAG) ? 1 : 0;
 
         if (msix) {
-                val &= ~HC_CONFIG_0_REG_SINGLE_ISR_EN_0;
+                val &= ~(HC_CONFIG_0_REG_SINGLE_ISR_EN_0 |
+                         HC_CONFIG_0_REG_INT_LINE_EN_0);
                 val |= (HC_CONFIG_0_REG_MSI_MSIX_INT_EN_0 |
                         HC_CONFIG_0_REG_ATTN_BIT_EN_0);
+        } else if (msi) {
+                val &= ~HC_CONFIG_0_REG_INT_LINE_EN_0;
+                val |= (HC_CONFIG_0_REG_SINGLE_ISR_EN_0 |
+                        HC_CONFIG_0_REG_MSI_MSIX_INT_EN_0 |
+                        HC_CONFIG_0_REG_ATTN_BIT_EN_0);
         } else {
                 val |= (HC_CONFIG_0_REG_SINGLE_ISR_EN_0 |
                         HC_CONFIG_0_REG_MSI_MSIX_INT_EN_0 |
                         HC_CONFIG_0_REG_INT_LINE_EN_0 |
                         HC_CONFIG_0_REG_ATTN_BIT_EN_0);
 
-                DP(NETIF_MSG_INTR, "write %x to HC %d (addr 0x%x)  MSI-X %d\n",
-                   val, port, addr, msix);
+                DP(NETIF_MSG_INTR, "write %x to HC %d (addr 0x%x)\n",
+                   val, port, addr);
 
                 REG_WR(bp, addr, val);
 
                 val &= ~HC_CONFIG_0_REG_MSI_MSIX_INT_EN_0;
         }
 
-        DP(NETIF_MSG_INTR, "write %x to HC %d (addr 0x%x)  MSI-X %d\n",
-           val, port, addr, msix);
+        DP(NETIF_MSG_INTR, "write %x to HC %d (addr 0x%x)  mode %s\n",
+           val, port, addr, (msix ? "MSI-X" : (msi ? "MSI" : "INTx")));
 
         REG_WR(bp, addr, val);
 
         if (CHIP_IS_E1H(bp)) {
                 /* init leading/trailing edge */
                 if (IS_E1HMF(bp)) {
-                        val = (0xfe0f | (1 << (BP_E1HVN(bp) + 4)));
+                        val = (0xee0f | (1 << (BP_E1HVN(bp) + 4)));
                         if (bp->port.pmf)
                                 /* enable nig attention */
                                 val |= 0x0100;
@@ -641,6 +650,9 @@ static void bnx2x_int_disable(struct bnx2x *bp)
         DP(NETIF_MSG_INTR, "write %x to HC %d (addr 0x%x)\n",
            val, port, addr);
 
+        /* flush all outstanding writes */
+        mmiowb();
+
         REG_WR(bp, addr, val);
         if (REG_RD(bp, addr) != val)
                 BNX2X_ERR("BUG! proper val not read from IGU!\n");
@@ -649,7 +661,7 @@ static void bnx2x_int_disable(struct bnx2x *bp)
 static void bnx2x_int_disable_sync(struct bnx2x *bp, int disable_hw)
 {
         int msix = (bp->flags & USING_MSIX_FLAG) ? 1 : 0;
-        int i;
+        int i, offset;
 
         /* disable interrupt handling */
         atomic_inc(&bp->intr_sem);
@@ -659,11 +671,10 @@ static void bnx2x_int_disable_sync(struct bnx2x *bp, int disable_hw)
 
         /* make sure all ISRs are done */
         if (msix) {
+                synchronize_irq(bp->msix_table[0].vector);
+                offset = 1;
                 for_each_queue(bp, i)
-                        synchronize_irq(bp->msix_table[i].vector);
-
-                /* one more for the Slow Path IRQ */
-                synchronize_irq(bp->msix_table[i].vector);
+                        synchronize_irq(bp->msix_table[i + offset].vector);
         } else
                 synchronize_irq(bp->pdev->irq);
 
@@ -5198,6 +5209,8 @@ static int bnx2x_init_common(struct bnx2x *bp)
         REG_WR(bp, PXP2_REG_RQ_SRC_ENDIAN_M, 1);
         REG_WR(bp, PXP2_REG_RQ_CDU_ENDIAN_M, 1);
         REG_WR(bp, PXP2_REG_RQ_DBG_ENDIAN_M, 1);
+        /* make sure this value is 0 */
+        REG_WR(bp, PXP2_REG_RQ_HC_ENDIAN_M, 0);
 
 /*      REG_WR(bp, PXP2_REG_RD_PBF_SWAP_MODE, 1); */
         REG_WR(bp, PXP2_REG_RD_QM_SWAP_MODE, 1);
@@ -5648,10 +5661,17 @@ static int bnx2x_init_func(struct bnx2x *bp)
 {
         int port = BP_PORT(bp);
         int func = BP_FUNC(bp);
+        u32 addr, val;
         int i;
 
         DP(BNX2X_MSG_MCP, "starting func init  func %x\n", func);
 
+        /* set MSI reconfigure capability */
+        addr = (port ? HC_REG_CONFIG_1 : HC_REG_CONFIG_0);
+        val = REG_RD(bp, addr);
+        val |= HC_CONFIG_0_REG_MSI_ATTN_EN_0;
+        REG_WR(bp, addr, val);
+
         i = FUNC_ILT_BASE(func);
 
         bnx2x_ilt_wr(bp, i, bnx2x_sp_mapping(bp, context));
@@ -6053,10 +6073,6 @@ static void bnx2x_free_msix_irqs(struct bnx2x *bp)
                    "state %x\n", i, bp->msix_table[i + offset].vector,
                    bnx2x_fp(bp, i, state));
 
-                if (bnx2x_fp(bp, i, state) != BNX2X_FP_STATE_CLOSED)
-                        BNX2X_ERR("IRQ of fp #%d being freed while "
-                                  "state != closed\n", i);
-
                 free_irq(bp->msix_table[i + offset].vector, &bp->fp[i]);
         }
 }
@@ -6068,21 +6084,25 @@ static void bnx2x_free_irq(struct bnx2x *bp)
                 pci_disable_msix(bp->pdev);
                 bp->flags &= ~USING_MSIX_FLAG;
 
+        } else if (bp->flags & USING_MSI_FLAG) {
+                free_irq(bp->pdev->irq, bp->dev);
+                pci_disable_msi(bp->pdev);
+                bp->flags &= ~USING_MSI_FLAG;
+
         } else
                 free_irq(bp->pdev->irq, bp->dev);
 }
 
 static int bnx2x_enable_msix(struct bnx2x *bp)
 {
-        int i, rc, offset;
+        int i, rc, offset = 1;
+        int igu_vec = 0;
 
-        bp->msix_table[0].entry = 0;
-        offset = 1;
-        DP(NETIF_MSG_IFUP, "msix_table[0].entry = 0 (slowpath)\n");
+        bp->msix_table[0].entry = igu_vec;
+        DP(NETIF_MSG_IFUP, "msix_table[0].entry = %d (slowpath)\n", igu_vec);
 
         for_each_queue(bp, i) {
-                int igu_vec = offset + i + BP_L_ID(bp);
-
+                igu_vec = BP_L_ID(bp) + offset + i;
                 bp->msix_table[i + offset].entry = igu_vec;
                 DP(NETIF_MSG_IFUP, "msix_table[%d].entry = %d "
                    "(fastpath #%u)\n", i + offset, igu_vec, i);
@@ -6091,9 +6111,10 @@ static int bnx2x_enable_msix(struct bnx2x *bp)
         rc = pci_enable_msix(bp->pdev, &bp->msix_table[0],
                              BNX2X_NUM_QUEUES(bp) + offset);
         if (rc) {
-                DP(NETIF_MSG_IFUP, "MSI-X is not attainable\n");
-                return -1;
+                DP(NETIF_MSG_IFUP, "MSI-X is not attainable  rc %d\n", rc);
+                return rc;
         }
+
         bp->flags |= USING_MSIX_FLAG;
 
         return 0;
@@ -6140,11 +6161,31 @@ static int bnx2x_req_msix_irqs(struct bnx2x *bp)
         return 0;
 }
 
+static int bnx2x_enable_msi(struct bnx2x *bp)
+{
+        int rc;
+
+        rc = pci_enable_msi(bp->pdev);
+        if (rc) {
+                DP(NETIF_MSG_IFUP, "MSI is not attainable\n");
+                return -1;
+        }
+        bp->flags |= USING_MSI_FLAG;
+
+        return 0;
+}
+
 static int bnx2x_req_irq(struct bnx2x *bp)
 {
+        unsigned long flags;
         int rc;
 
-        rc = request_irq(bp->pdev->irq, bnx2x_interrupt, IRQF_SHARED,
+        if (bp->flags & USING_MSI_FLAG)
+                flags = 0;
+        else
+                flags = IRQF_SHARED;
+
+        rc = request_irq(bp->pdev->irq, bnx2x_interrupt, flags,
                          bp->dev->name, bp->dev);
         if (!rc)
                 bnx2x_fp(bp, 0, state) = BNX2X_FP_STATE_IRQ;
@@ -6365,28 +6406,23 @@ static int bnx2x_setup_multi(struct bnx2x *bp, int index)
 }
 
 static int bnx2x_poll(struct napi_struct *napi, int budget);
-static void bnx2x_set_rx_mode(struct net_device *dev);
 
-/* must be called with rtnl_lock */
-static int bnx2x_nic_load(struct bnx2x *bp, int load_mode)
+static void bnx2x_set_int_mode(struct bnx2x *bp)
 {
-        u32 load_code;
-        int i, rc = 0;
         int num_queues;
-#ifdef BNX2X_STOP_ON_ERROR
-        if (unlikely(bp->panic))
-                return -EPERM;
-#endif
-
-        bp->state = BNX2X_STATE_OPENING_WAIT4_LOAD;
 
-        if (use_inta) {
+        switch (int_mode) {
+        case INT_MODE_INTx:
+        case INT_MODE_MSI:
                 num_queues = 1;
                 bp->num_rx_queues = num_queues;
                 bp->num_tx_queues = num_queues;
                 DP(NETIF_MSG_IFUP,
                    "set number of queues to %d\n", num_queues);
-        } else {
+                break;
+
+        case INT_MODE_MSIX:
+        default:
                 if (bp->multi_mode == ETH_RSS_MODE_REGULAR)
                         num_queues = min_t(u32, num_online_cpus(),
                                            BNX2X_MAX_QUEUES(bp));
@@ -6401,8 +6437,7 @@ static int bnx2x_nic_load(struct bnx2x *bp, int load_mode)
                  * so try to enable MSI-X with the requested number of fp's
                  * and fallback to MSI or legacy INTx with one fp
                  */
-                rc = bnx2x_enable_msix(bp);
-                if (rc) {
+                if (bnx2x_enable_msix(bp)) {
                         /* failed to enable MSI-X */
                         num_queues = 1;
                         bp->num_rx_queues = num_queues;
@@ -6412,8 +6447,27 @@ static int bnx2x_nic_load(struct bnx2x *bp, int load_mode)
                                           "enable MSI-X  set number of "
                                           "queues to %d\n", num_queues);
                 }
+                break;
         }
         bp->dev->real_num_tx_queues = bp->num_tx_queues;
+}
+
+static void bnx2x_set_rx_mode(struct net_device *dev);
+
+/* must be called with rtnl_lock */
+static int bnx2x_nic_load(struct bnx2x *bp, int load_mode)
+{
+        u32 load_code;
+        int i, rc = 0;
+#ifdef BNX2X_STOP_ON_ERROR
+        DP(NETIF_MSG_IFUP, "enter  load_mode %d\n", load_mode);
+        if (unlikely(bp->panic))
+                return -EPERM;
+#endif
+
+        bp->state = BNX2X_STATE_OPENING_WAIT4_LOAD;
+
+        bnx2x_set_int_mode(bp);
 
         if (bnx2x_alloc_mem(bp))
                 return -ENOMEM;
@@ -6445,14 +6499,22 @@ static int bnx2x_nic_load(struct bnx2x *bp, int load_mode)
                         pci_disable_msix(bp->pdev);
                         goto load_error1;
                 }
-                printk(KERN_INFO PFX "%s: using MSI-X\n", bp->dev->name);
         } else {
+                if ((rc != -ENOMEM) && (int_mode != INT_MODE_INTx))
+                        bnx2x_enable_msi(bp);
                 bnx2x_ack_int(bp);
                 rc = bnx2x_req_irq(bp);
                 if (rc) {
                         BNX2X_ERR("IRQ request failed  rc %d, aborting\n", rc);
+                        if (bp->flags & USING_MSI_FLAG)
+                                pci_disable_msi(bp->pdev);
                         goto load_error1;
                 }
+                if (bp->flags & USING_MSI_FLAG) {
+                        bp->dev->irq = bp->pdev->irq;
+                        printk(KERN_INFO PFX "%s: using MSI  IRQ %d\n",
+                               bp->dev->name, bp->pdev->irq);
+                }
         }
 
         /* Send LOAD_REQUEST command to MCP
@@ -6689,8 +6751,6 @@ static void bnx2x_reset_func(struct bnx2x *bp)
         REG_WR(bp, HC_REG_LEADING_EDGE_0 + port*8, 0);
         REG_WR(bp, HC_REG_TRAILING_EDGE_0 + port*8, 0);
 
-        REG_WR(bp, HC_REG_CONFIG_0 + port*4, 0x1000);
-
         /* Clear ILT */
         base = FUNC_ILT_BASE(func);
         for (i = base; i < base + ILT_PER_FUNC; i++)
@@ -7636,9 +7696,10 @@ static int __devinit bnx2x_init_bp(struct bnx2x *bp)
                        "MCP disabled, must load devices in order!\n");
 
         /* Set multi queue mode */
-        if ((multi_mode != ETH_RSS_MODE_DISABLED) && (!use_inta)) {
+        if ((multi_mode != ETH_RSS_MODE_DISABLED) &&
+            ((int_mode == INT_MODE_INTx) || (int_mode == INT_MODE_MSI))) {
                 printk(KERN_ERR PFX
-                      "Multi disabled since INTA is requested\n");
+                      "Multi disabled since int_mode requested is not MSI-X\n");
                 multi_mode = ETH_RSS_MODE_DISABLED;
         }
         bp->multi_mode = multi_mode;