cf4e636385
New iSCSI driver for Broadcom BNX2 devices. The driver interfaces with the CNIC driver to access the hardware. Signed-off-by: Anil Veerabhadrappa <anilgv@broadcom.com> Signed-off-by: Michael Chan <mchan@broadcom.com> Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
438 lines
12 KiB
C
438 lines
12 KiB
C
/* bnx2i.c: Broadcom NetXtreme II iSCSI driver.
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*
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* Copyright (c) 2006 - 2009 Broadcom Corporation
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* Copyright (c) 2007, 2008 Red Hat, Inc. All rights reserved.
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* Copyright (c) 2007, 2008 Mike Christie
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation.
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*
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* Written by: Anil Veerabhadrappa (anilgv@broadcom.com)
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*/
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#include "bnx2i.h"
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static struct list_head adapter_list = LIST_HEAD_INIT(adapter_list);
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static u32 adapter_count;
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static int bnx2i_reg_device;
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#define DRV_MODULE_NAME "bnx2i"
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#define DRV_MODULE_VERSION "2.0.1d"
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#define DRV_MODULE_RELDATE "Mar 25, 2009"
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static char version[] __devinitdata =
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"Broadcom NetXtreme II iSCSI Driver " DRV_MODULE_NAME \
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" v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
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MODULE_AUTHOR("Anil Veerabhadrappa <anilgv@broadcom.com>");
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MODULE_DESCRIPTION("Broadcom NetXtreme II BCM5706/5708/5709 iSCSI Driver");
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MODULE_LICENSE("GPL");
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MODULE_VERSION(DRV_MODULE_VERSION);
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static DEFINE_RWLOCK(bnx2i_dev_lock);
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unsigned int event_coal_div = 1;
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module_param(event_coal_div, int, 0664);
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MODULE_PARM_DESC(event_coal_div, "Event Coalescing Divide Factor");
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unsigned int en_tcp_dack = 1;
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module_param(en_tcp_dack, int, 0664);
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MODULE_PARM_DESC(en_tcp_dack, "Enable TCP Delayed ACK");
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unsigned int error_mask1 = 0x00;
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module_param(error_mask1, int, 0664);
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MODULE_PARM_DESC(error_mask1, "Config FW iSCSI Error Mask #1");
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unsigned int error_mask2 = 0x00;
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module_param(error_mask2, int, 0664);
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MODULE_PARM_DESC(error_mask2, "Config FW iSCSI Error Mask #2");
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unsigned int sq_size;
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module_param(sq_size, int, 0664);
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MODULE_PARM_DESC(sq_size, "Configure SQ size");
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unsigned int rq_size = BNX2I_RQ_WQES_DEFAULT;
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module_param(rq_size, int, 0664);
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MODULE_PARM_DESC(rq_size, "Configure RQ size");
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u64 iscsi_error_mask = 0x00;
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static void bnx2i_unreg_one_device(struct bnx2i_hba *hba) ;
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/**
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* bnx2i_identify_device - identifies NetXtreme II device type
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* @hba: Adapter structure pointer
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*
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* This function identifies the NX2 device type and sets appropriate
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* queue mailbox register access method, 5709 requires driver to
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* access MBOX regs using *bin* mode
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*/
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void bnx2i_identify_device(struct bnx2i_hba *hba)
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{
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hba->cnic_dev_type = 0;
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if ((hba->pci_did == PCI_DEVICE_ID_NX2_5706) ||
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(hba->pci_did == PCI_DEVICE_ID_NX2_5706S))
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set_bit(BNX2I_NX2_DEV_5706, &hba->cnic_dev_type);
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else if ((hba->pci_did == PCI_DEVICE_ID_NX2_5708) ||
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(hba->pci_did == PCI_DEVICE_ID_NX2_5708S))
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set_bit(BNX2I_NX2_DEV_5708, &hba->cnic_dev_type);
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else if ((hba->pci_did == PCI_DEVICE_ID_NX2_5709) ||
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(hba->pci_did == PCI_DEVICE_ID_NX2_5709S)) {
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set_bit(BNX2I_NX2_DEV_5709, &hba->cnic_dev_type);
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hba->mail_queue_access = BNX2I_MQ_BIN_MODE;
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} else if (hba->pci_did == PCI_DEVICE_ID_NX2_57710 ||
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hba->pci_did == PCI_DEVICE_ID_NX2_57711)
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set_bit(BNX2I_NX2_DEV_57710, &hba->cnic_dev_type);
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}
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/**
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* get_adapter_list_head - returns head of adapter list
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*/
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struct bnx2i_hba *get_adapter_list_head(void)
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{
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struct bnx2i_hba *hba = NULL;
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struct bnx2i_hba *tmp_hba;
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if (!adapter_count)
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goto hba_not_found;
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read_lock(&bnx2i_dev_lock);
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list_for_each_entry(tmp_hba, &adapter_list, link) {
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if (tmp_hba->cnic && tmp_hba->cnic->cm_select_dev) {
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hba = tmp_hba;
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break;
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}
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}
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read_unlock(&bnx2i_dev_lock);
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hba_not_found:
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return hba;
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}
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/**
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* bnx2i_find_hba_for_cnic - maps cnic device instance to bnx2i adapter instance
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* @cnic: pointer to cnic device instance
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*
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*/
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struct bnx2i_hba *bnx2i_find_hba_for_cnic(struct cnic_dev *cnic)
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{
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struct bnx2i_hba *hba, *temp;
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read_lock(&bnx2i_dev_lock);
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list_for_each_entry_safe(hba, temp, &adapter_list, link) {
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if (hba->cnic == cnic) {
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read_unlock(&bnx2i_dev_lock);
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return hba;
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}
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}
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read_unlock(&bnx2i_dev_lock);
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return NULL;
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}
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/**
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* bnx2i_start - cnic callback to initialize & start adapter instance
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* @handle: transparent handle pointing to adapter structure
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*
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* This function maps adapter structure to pcidev structure and initiates
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* firmware handshake to enable/initialize on chip iscsi components
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* This bnx2i - cnic interface api callback is issued after following
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* 2 conditions are met -
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* a) underlying network interface is up (marked by event 'NETDEV_UP'
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* from netdev
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* b) bnx2i adapter instance is registered
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*/
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void bnx2i_start(void *handle)
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{
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#define BNX2I_INIT_POLL_TIME (1000 / HZ)
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struct bnx2i_hba *hba = handle;
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int i = HZ;
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bnx2i_send_fw_iscsi_init_msg(hba);
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while (!test_bit(ADAPTER_STATE_UP, &hba->adapter_state) && i--)
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msleep(BNX2I_INIT_POLL_TIME);
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}
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/**
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* bnx2i_stop - cnic callback to shutdown adapter instance
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* @handle: transparent handle pointing to adapter structure
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*
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* driver checks if adapter is already in shutdown mode, if not start
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* the shutdown process
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*/
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void bnx2i_stop(void *handle)
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{
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struct bnx2i_hba *hba = handle;
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/* check if cleanup happened in GOING_DOWN context */
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clear_bit(ADAPTER_STATE_UP, &hba->adapter_state);
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if (!test_and_clear_bit(ADAPTER_STATE_GOING_DOWN,
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&hba->adapter_state))
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iscsi_host_for_each_session(hba->shost,
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bnx2i_drop_session);
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}
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/**
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* bnx2i_register_device - register bnx2i adapter instance with the cnic driver
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* @hba: Adapter instance to register
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*
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* registers bnx2i adapter instance with the cnic driver while holding the
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* adapter structure lock
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*/
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void bnx2i_register_device(struct bnx2i_hba *hba)
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{
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if (test_bit(ADAPTER_STATE_GOING_DOWN, &hba->adapter_state) ||
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test_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic)) {
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return;
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}
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hba->cnic->register_device(hba->cnic, CNIC_ULP_ISCSI, hba);
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spin_lock(&hba->lock);
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bnx2i_reg_device++;
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spin_unlock(&hba->lock);
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set_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic);
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}
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/**
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* bnx2i_reg_dev_all - registers all adapter instances with the cnic driver
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*
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* registers all bnx2i adapter instances with the cnic driver while holding
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* the global resource lock
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*/
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void bnx2i_reg_dev_all(void)
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{
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struct bnx2i_hba *hba, *temp;
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read_lock(&bnx2i_dev_lock);
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list_for_each_entry_safe(hba, temp, &adapter_list, link)
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bnx2i_register_device(hba);
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read_unlock(&bnx2i_dev_lock);
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}
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/**
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* bnx2i_unreg_one_device - unregister adapter instance with the cnic driver
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* @hba: Adapter instance to unregister
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*
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* registers bnx2i adapter instance with the cnic driver while holding
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* the adapter structure lock
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*/
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static void bnx2i_unreg_one_device(struct bnx2i_hba *hba)
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{
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if (hba->ofld_conns_active ||
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!test_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic) ||
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test_bit(ADAPTER_STATE_GOING_DOWN, &hba->adapter_state))
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return;
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hba->cnic->unregister_device(hba->cnic, CNIC_ULP_ISCSI);
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spin_lock(&hba->lock);
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bnx2i_reg_device--;
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spin_unlock(&hba->lock);
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/* ep_disconnect could come before NETDEV_DOWN, driver won't
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* see NETDEV_DOWN as it already unregistered itself.
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*/
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hba->adapter_state = 0;
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clear_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic);
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}
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/**
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* bnx2i_unreg_dev_all - unregisters all bnx2i instances with the cnic driver
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*
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* unregisters all bnx2i adapter instances with the cnic driver while holding
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* the global resource lock
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*/
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void bnx2i_unreg_dev_all(void)
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{
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struct bnx2i_hba *hba, *temp;
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read_lock(&bnx2i_dev_lock);
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list_for_each_entry_safe(hba, temp, &adapter_list, link)
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bnx2i_unreg_one_device(hba);
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read_unlock(&bnx2i_dev_lock);
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}
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/**
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* bnx2i_init_one - initialize an adapter instance and allocate memory resources
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* @hba: bnx2i adapter instance
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* @cnic: cnic device handle
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*
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* Global resource lock and host adapter lock is held during critical sections
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* below. This routine is called from cnic_register_driver() context and
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* work horse thread which does majority of device specific initialization
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*/
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static int bnx2i_init_one(struct bnx2i_hba *hba, struct cnic_dev *cnic)
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{
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int rc;
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read_lock(&bnx2i_dev_lock);
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if (bnx2i_reg_device &&
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!test_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic)) {
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rc = cnic->register_device(cnic, CNIC_ULP_ISCSI, hba);
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if (rc) /* duplicate registration */
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printk(KERN_ERR "bnx2i- dev reg failed\n");
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spin_lock(&hba->lock);
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bnx2i_reg_device++;
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hba->age++;
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spin_unlock(&hba->lock);
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set_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic);
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}
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read_unlock(&bnx2i_dev_lock);
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write_lock(&bnx2i_dev_lock);
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list_add_tail(&hba->link, &adapter_list);
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adapter_count++;
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write_unlock(&bnx2i_dev_lock);
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return 0;
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}
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/**
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* bnx2i_ulp_init - initialize an adapter instance
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* @dev: cnic device handle
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*
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* Called from cnic_register_driver() context to initialize all enumerated
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* cnic devices. This routine allocate adapter structure and other
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* device specific resources.
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*/
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void bnx2i_ulp_init(struct cnic_dev *dev)
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{
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struct bnx2i_hba *hba;
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/* Allocate a HBA structure for this device */
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hba = bnx2i_alloc_hba(dev);
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if (!hba) {
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printk(KERN_ERR "bnx2i init: hba initialization failed\n");
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return;
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}
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/* Get PCI related information and update hba struct members */
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clear_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic);
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if (bnx2i_init_one(hba, dev)) {
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printk(KERN_ERR "bnx2i - hba %p init failed\n", hba);
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bnx2i_free_hba(hba);
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} else
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hba->cnic = dev;
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}
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/**
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* bnx2i_ulp_exit - shuts down adapter instance and frees all resources
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* @dev: cnic device handle
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*
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*/
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void bnx2i_ulp_exit(struct cnic_dev *dev)
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{
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struct bnx2i_hba *hba;
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hba = bnx2i_find_hba_for_cnic(dev);
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if (!hba) {
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printk(KERN_INFO "bnx2i_ulp_exit: hba not "
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"found, dev 0x%p\n", dev);
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return;
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}
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write_lock(&bnx2i_dev_lock);
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list_del_init(&hba->link);
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adapter_count--;
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if (test_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic)) {
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hba->cnic->unregister_device(hba->cnic, CNIC_ULP_ISCSI);
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clear_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic);
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spin_lock(&hba->lock);
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bnx2i_reg_device--;
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spin_unlock(&hba->lock);
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}
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write_unlock(&bnx2i_dev_lock);
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bnx2i_free_hba(hba);
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}
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/**
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* bnx2i_mod_init - module init entry point
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*
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* initialize any driver wide global data structures such as endpoint pool,
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* tcp port manager/queue, sysfs. finally driver will register itself
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* with the cnic module
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*/
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static int __init bnx2i_mod_init(void)
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{
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int err;
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printk(KERN_INFO "%s", version);
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if (!is_power_of_2(sq_size))
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sq_size = roundup_pow_of_two(sq_size);
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bnx2i_scsi_xport_template =
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iscsi_register_transport(&bnx2i_iscsi_transport);
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if (!bnx2i_scsi_xport_template) {
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printk(KERN_ERR "Could not register bnx2i transport.\n");
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err = -ENOMEM;
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goto out;
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}
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err = cnic_register_driver(CNIC_ULP_ISCSI, &bnx2i_cnic_cb);
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if (err) {
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printk(KERN_ERR "Could not register bnx2i cnic driver.\n");
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goto unreg_xport;
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}
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return 0;
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unreg_xport:
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iscsi_unregister_transport(&bnx2i_iscsi_transport);
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out:
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return err;
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}
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/**
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* bnx2i_mod_exit - module cleanup/exit entry point
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*
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* Global resource lock and host adapter lock is held during critical sections
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* in this function. Driver will browse through the adapter list, cleans-up
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* each instance, unregisters iscsi transport name and finally driver will
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* unregister itself with the cnic module
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*/
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static void __exit bnx2i_mod_exit(void)
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{
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struct bnx2i_hba *hba;
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write_lock(&bnx2i_dev_lock);
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while (!list_empty(&adapter_list)) {
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hba = list_entry(adapter_list.next, struct bnx2i_hba, link);
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list_del(&hba->link);
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adapter_count--;
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if (test_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic)) {
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hba->cnic->unregister_device(hba->cnic, CNIC_ULP_ISCSI);
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clear_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic);
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bnx2i_reg_device--;
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}
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write_unlock(&bnx2i_dev_lock);
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bnx2i_free_hba(hba);
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write_lock(&bnx2i_dev_lock);
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}
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write_unlock(&bnx2i_dev_lock);
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iscsi_unregister_transport(&bnx2i_iscsi_transport);
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cnic_unregister_driver(CNIC_ULP_ISCSI);
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}
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module_init(bnx2i_mod_init);
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module_exit(bnx2i_mod_exit);
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