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>

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);
 }
 
 /**

drivers/infiniband/hw/nes/nes.h

@@ -169,7 +169,7 @@ extern int disable_mpa_crc;
 extern unsigned int send_first;
 extern unsigned int nes_drv_opt;
 extern unsigned int nes_debug_level;
-
+extern unsigned int wqm_quanta;
 extern struct list_head nes_adapter_list;
 
 extern atomic_t cm_connects;

drivers/infiniband/hw/nes/nes_hw.c

@@ -861,7 +861,8 @@ static void nes_init_csr_ne020(struct nes_device *nesdev, u8 hw_rev, u8 port_cou
 
 	nes_write_indexed(nesdev, 0x00005000, 0x00018000);
 	/* nes_write_indexed(nesdev, 0x00005000, 0x00010000); */
-	nes_write_indexed(nesdev, 0x00005004, 0x00020001);
+	nes_write_indexed(nesdev, NES_IDX_WQM_CONFIG1, (wqm_quanta << 1) |
+							 0x00000001);
 	nes_write_indexed(nesdev, 0x00005008, 0x1F1F1F1F);
 	nes_write_indexed(nesdev, 0x00005010, 0x1F1F1F1F);
 	nes_write_indexed(nesdev, 0x00005018, 0x1F1F1F1F);

drivers/infiniband/hw/nes/nes_hw.h

@@ -156,6 +156,7 @@ enum indexed_regs {
 	NES_IDX_ENDNODE0_NSTAT_TX_OCTETS_HI = 0x7004,
 	NES_IDX_ENDNODE0_NSTAT_TX_FRAMES_LO = 0x7008,
 	NES_IDX_ENDNODE0_NSTAT_TX_FRAMES_HI = 0x700c,
+	NES_IDX_WQM_CONFIG1 = 0x5004,
 	NES_IDX_CM_CONFIG = 0x5100,
 	NES_IDX_NIC_LOGPORT_TO_PHYPORT = 0x6000,
 	NES_IDX_NIC_PHYPORT_TO_USW = 0x6008,
@@ -1079,6 +1080,7 @@ struct nes_adapter {
 	u32 et_rx_max_coalesced_frames_high;
 	u32 et_rate_sample_interval;
 	u32 timer_int_limit;
+	u32 wqm_quanta;
 
 	/* Adapter base MAC address */
 	u32 mac_addr_low;