RDMA/nes: Add wqm_quanta module option

Add a module parameter wqm_quanta.  It controls the number of segments
transmitted at a time.

Signed-off-by: Sweta Bhatt <sweta.bhatt@einfochips.com>
Signed-off-by: Chien Tung <ctung@neteffect.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 58 insertions, 0 deletions

diff --git a/drivers/infiniband/hw/nes/nes.c b/drivers/infiniband/hw/nes/nes.c
index 30c93db5a74e..a2b04d62b1a4 100644
--- a/drivers/infiniband/hw/nes/nes.c
+++ b/drivers/infiniband/hw/nes/nes.c
@@ -91,6 +91,10 @@ unsigned int nes_debug_level = 0;
 module_param_named(debug_level, nes_debug_level, uint, 0644);
 MODULE_PARM_DESC(debug_level, "Enable debug output level");
 
+unsigned int wqm_quanta = 0x10000;
+module_param(wqm_quanta, int, 0644);
+MODULE_PARM_DESC(wqm_quanta, "WQM quanta");
+
 LIST_HEAD(nes_adapter_list);
 static LIST_HEAD(nes_dev_list);
 
@@ -557,6 +561,7 @@ static int __devinit nes_probe(struct pci_dev *pcidev, const struct pci_device_i
 		goto bail5;
 	}
 	nesdev->nesadapter->et_rx_coalesce_usecs_irq = interrupt_mod_interval;
+	nesdev->nesadapter->wqm_quanta = wqm_quanta;
 
 	/* nesdev->base_doorbell_index =
 			nesdev->nesadapter->pd_config_base[PCI_FUNC(nesdev->pcidev->devfn)]; */
@@ -1069,6 +1074,55 @@ static ssize_t nes_store_idx_data(struct device_driver *ddp,
 	return strnlen(buf, count);
 }
 
+
+/**
+ * nes_show_wqm_quanta
+ */
+static ssize_t nes_show_wqm_quanta(struct device_driver *ddp, char *buf)
+{
+	u32 wqm_quanta_value = 0xdead;
+	u32 i = 0;
+	struct nes_device *nesdev;
+
+	list_for_each_entry(nesdev, &nes_dev_list, list) {
+		if (i == ee_flsh_adapter) {
+			wqm_quanta_value = nesdev->nesadapter->wqm_quanta;
+			break;
+		}
+		i++;
+	}
+
+	return  snprintf(buf, PAGE_SIZE, "0x%X\n", wqm_quanta);
+}
+
+
+/**
+ * nes_store_wqm_quanta
+ */
+static ssize_t nes_store_wqm_quanta(struct device_driver *ddp,
+					const char *buf, size_t count)
+{
+	unsigned long wqm_quanta_value;
+	u32 wqm_config1;
+	u32 i = 0;
+	struct nes_device *nesdev;
+
+	strict_strtoul(buf, 0, &wqm_quanta_value);
+	list_for_each_entry(nesdev, &nes_dev_list, list) {
+		if (i == ee_flsh_adapter) {
+			nesdev->nesadapter->wqm_quanta = wqm_quanta_value;
+			wqm_config1 = nes_read_indexed(nesdev,
+						NES_IDX_WQM_CONFIG1);
+			nes_write_indexed(nesdev, NES_IDX_WQM_CONFIG1,
+					((wqm_quanta_value << 1) |
+					(wqm_config1 & 0x00000001)));
+			break;
+		}
+		i++;
+	}
+	return strnlen(buf, count);
+}
+
 static DRIVER_ATTR(adapter, S_IRUSR | S_IWUSR,
 		   nes_show_adapter, nes_store_adapter);
 static DRIVER_ATTR(eeprom_cmd, S_IRUSR | S_IWUSR,
@@ -1087,6 +1141,8 @@ static DRIVER_ATTR(idx_addr, S_IRUSR | S_IWUSR,
 		   nes_show_idx_addr, nes_store_idx_addr);
 static DRIVER_ATTR(idx_data, S_IRUSR | S_IWUSR,
 		   nes_show_idx_data, nes_store_idx_data);
+static DRIVER_ATTR(wqm_quanta, S_IRUSR | S_IWUSR,
+		   nes_show_wqm_quanta, nes_store_wqm_quanta);
 
 static int nes_create_driver_sysfs(struct pci_driver *drv)
 {
@@ -1100,6 +1156,7 @@ static int nes_create_driver_sysfs(struct pci_driver *drv)
 	error |= driver_create_file(&drv->driver, &driver_attr_nonidx_data);
 	error |= driver_create_file(&drv->driver, &driver_attr_idx_addr);
 	error |= driver_create_file(&drv->driver, &driver_attr_idx_data);
+	error |= driver_create_file(&drv->driver, &driver_attr_wqm_quanta);
 	return error;
 }
 
@@ -1114,6 +1171,7 @@ static void nes_remove_driver_sysfs(struct pci_driver *drv)
 	driver_remove_file(&drv->driver, &driver_attr_nonidx_data);
 	driver_remove_file(&drv->driver, &driver_attr_idx_addr);
 	driver_remove_file(&drv->driver, &driver_attr_idx_data);
+	driver_remove_file(&drv->driver, &driver_attr_wqm_quanta);
 }
 
 /**