scsi: qedi: Add support for Boot from SAN over iSCSI offload

This patch adds support for Boot from SAN over iSCSI offload. The iSCSI
boot information in the NVRAM is populated under
/sys/firmware/iscsi_bootX/ using qed NVM-image reading API and further
exported to open-iscsi to perform iSCSI login enabling boot over offload
iSCSI interface in a Boot from SAN environment.

Signed-off-by: Arun Easi <arun.easi@cavium.com>
Signed-off-by: Andrew Vasquez <andrew.vasquez@cavium.com>
Signed-off-by: Manish Rangankar <manish.rangankar@cavium.com>
Signed-off-by: Nilesh Javali <nilesh.javali@cavium.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

1 files changed, 210 insertions, 0 deletions

diff --git a/drivers/scsi/qedi/qedi_nvm_iscsi_cfg.h b/drivers/scsi/qedi/qedi_nvm_iscsi_cfg.h
new file mode 100644
index 000000000000..df39b69b366d
--- /dev/null
+++ b/drivers/scsi/qedi/qedi_nvm_iscsi_cfg.h
@@ -0,0 +1,210 @@
+/*
+ * QLogic iSCSI Offload Driver
+ * Copyright (c) 2016 Cavium Inc.
+ *
+ * This software is available under the terms of the GNU General Public License
+ * (GPL) Version 2, available from the file COPYING in the main directory of
+ * this source tree.
+ */
+
+#ifndef NVM_ISCSI_CFG_H
+#define NVM_ISCSI_CFG_H
+
+#define NUM_OF_ISCSI_TARGET_PER_PF    4   /* Defined as per the
+					   * ISCSI IBFT constraint
+					   */
+#define NUM_OF_ISCSI_PF_SUPPORTED     4   /* One PF per Port -
+					   * assuming 4 port card
+					   */
+
+#define NVM_ISCSI_CFG_DHCP_NAME_MAX_LEN  256
+
+union nvm_iscsi_dhcp_vendor_id {
+	u32 value[NVM_ISCSI_CFG_DHCP_NAME_MAX_LEN / 4];
+	u8  byte[NVM_ISCSI_CFG_DHCP_NAME_MAX_LEN];
+};
+
+#define NVM_ISCSI_IPV4_ADDR_BYTE_LEN 4
+union nvm_iscsi_ipv4_addr {
+	u32 addr;
+	u8  byte[NVM_ISCSI_IPV4_ADDR_BYTE_LEN];
+};
+
+#define NVM_ISCSI_IPV6_ADDR_BYTE_LEN 16
+union nvm_iscsi_ipv6_addr {
+	u32 addr[4];
+	u8  byte[NVM_ISCSI_IPV6_ADDR_BYTE_LEN];
+};
+
+struct nvm_iscsi_initiator_ipv4 {
+	union nvm_iscsi_ipv4_addr addr;				/* 0x0 */
+	union nvm_iscsi_ipv4_addr subnet_mask;			/* 0x4 */
+	union nvm_iscsi_ipv4_addr gateway;			/* 0x8 */
+	union nvm_iscsi_ipv4_addr primary_dns;			/* 0xC */
+	union nvm_iscsi_ipv4_addr secondary_dns;		/* 0x10 */
+	union nvm_iscsi_ipv4_addr dhcp_addr;			/* 0x14 */
+
+	union nvm_iscsi_ipv4_addr isns_server;			/* 0x18 */
+	union nvm_iscsi_ipv4_addr slp_server;			/* 0x1C */
+	union nvm_iscsi_ipv4_addr primay_radius_server;		/* 0x20 */
+	union nvm_iscsi_ipv4_addr secondary_radius_server;	/* 0x24 */
+
+	union nvm_iscsi_ipv4_addr rsvd[4];			/* 0x28 */
+};
+
+struct nvm_iscsi_initiator_ipv6 {
+	union nvm_iscsi_ipv6_addr addr;				/* 0x0 */
+	union nvm_iscsi_ipv6_addr subnet_mask;			/* 0x10 */
+	union nvm_iscsi_ipv6_addr gateway;			/* 0x20 */
+	union nvm_iscsi_ipv6_addr primary_dns;			/* 0x30 */
+	union nvm_iscsi_ipv6_addr secondary_dns;		/* 0x40 */
+	union nvm_iscsi_ipv6_addr dhcp_addr;			/* 0x50 */
+
+	union nvm_iscsi_ipv6_addr isns_server;			/* 0x60 */
+	union nvm_iscsi_ipv6_addr slp_server;			/* 0x70 */
+	union nvm_iscsi_ipv6_addr primay_radius_server;		/* 0x80 */
+	union nvm_iscsi_ipv6_addr secondary_radius_server;	/* 0x90 */
+
+	union nvm_iscsi_ipv6_addr rsvd[3];			/* 0xA0 */
+
+	u32   config;						/* 0xD0 */
+#define NVM_ISCSI_CFG_INITIATOR_IPV6_SUBNET_MASK_PREFIX_MASK      0x000000FF
+#define NVM_ISCSI_CFG_INITIATOR_IPV6_SUBNET_MASK_PREFIX_OFFSET    0
+
+	u32   rsvd_1[3];
+};
+
+#define NVM_ISCSI_CFG_ISCSI_NAME_MAX_LEN  256
+union nvm_iscsi_name {
+	u32 value[NVM_ISCSI_CFG_ISCSI_NAME_MAX_LEN / 4];
+	u8  byte[NVM_ISCSI_CFG_ISCSI_NAME_MAX_LEN];
+};
+
+#define NVM_ISCSI_CFG_CHAP_NAME_MAX_LEN  256
+union nvm_iscsi_chap_name {
+	u32 value[NVM_ISCSI_CFG_CHAP_NAME_MAX_LEN / 4];
+	u8  byte[NVM_ISCSI_CFG_CHAP_NAME_MAX_LEN];
+};
+
+#define NVM_ISCSI_CFG_CHAP_PWD_MAX_LEN  16 /* md5 need per RFC1996
+					    * is 16 octets
+					    */
+union nvm_iscsi_chap_password {
+	u32 value[NVM_ISCSI_CFG_CHAP_PWD_MAX_LEN / 4];
+	u8 byte[NVM_ISCSI_CFG_CHAP_PWD_MAX_LEN];
+};
+
+union nvm_iscsi_lun {
+	u8  byte[8];
+	u32 value[2];
+};
+
+struct nvm_iscsi_generic {
+	u32 ctrl_flags;						/* 0x0 */
+#define NVM_ISCSI_CFG_GEN_CHAP_ENABLED                 BIT(0)
+#define NVM_ISCSI_CFG_GEN_DHCP_TCPIP_CONFIG_ENABLED    BIT(1)
+#define NVM_ISCSI_CFG_GEN_DHCP_ISCSI_CONFIG_ENABLED    BIT(2)
+#define NVM_ISCSI_CFG_GEN_IPV6_ENABLED                 BIT(3)
+#define NVM_ISCSI_CFG_GEN_IPV4_FALLBACK_ENABLED        BIT(4)
+#define NVM_ISCSI_CFG_GEN_ISNS_WORLD_LOGIN             BIT(5)
+#define NVM_ISCSI_CFG_GEN_ISNS_SELECTIVE_LOGIN         BIT(6)
+#define NVM_ISCSI_CFG_GEN_ADDR_REDIRECT_ENABLED	       BIT(7)
+#define NVM_ISCSI_CFG_GEN_CHAP_MUTUAL_ENABLED          BIT(8)
+
+	u32 timeout;						/* 0x4 */
+#define NVM_ISCSI_CFG_GEN_DHCP_REQUEST_TIMEOUT_MASK       0x0000FFFF
+#define NVM_ISCSI_CFG_GEN_DHCP_REQUEST_TIMEOUT_OFFSET     0
+#define NVM_ISCSI_CFG_GEN_PORT_LOGIN_TIMEOUT_MASK         0xFFFF0000
+#define NVM_ISCSI_CFG_GEN_PORT_LOGIN_TIMEOUT_OFFSET       16
+
+	union nvm_iscsi_dhcp_vendor_id  dhcp_vendor_id;		/* 0x8  */
+	u32 rsvd[62];						/* 0x108 */
+};
+
+struct nvm_iscsi_initiator {
+	struct nvm_iscsi_initiator_ipv4 ipv4;			/* 0x0 */
+	struct nvm_iscsi_initiator_ipv6 ipv6;			/* 0x38 */
+
+	union nvm_iscsi_name           initiator_name;		/* 0x118 */
+	union nvm_iscsi_chap_name      chap_name;		/* 0x218 */
+	union nvm_iscsi_chap_password  chap_password;		/* 0x318 */
+
+	u32 generic_cont0;					/* 0x398 */
+#define NVM_ISCSI_CFG_INITIATOR_VLAN_MASK		0x0000FFFF
+#define NVM_ISCSI_CFG_INITIATOR_VLAN_OFFSET		0
+#define NVM_ISCSI_CFG_INITIATOR_IP_VERSION_MASK		0x00030000
+#define NVM_ISCSI_CFG_INITIATOR_IP_VERSION_OFFSET	16
+#define NVM_ISCSI_CFG_INITIATOR_IP_VERSION_4		1
+#define NVM_ISCSI_CFG_INITIATOR_IP_VERSION_6		2
+#define NVM_ISCSI_CFG_INITIATOR_IP_VERSION_4_AND_6	3
+
+	u32 ctrl_flags;
+#define NVM_ISCSI_CFG_INITIATOR_IP_VERSION_PRIORITY_V6     BIT(0)
+#define NVM_ISCSI_CFG_INITIATOR_VLAN_ENABLED               BIT(1)
+
+	u32 rsvd[116];						/* 0x32C */
+};
+
+struct nvm_iscsi_target {
+	u32 ctrl_flags;						/* 0x0 */
+#define NVM_ISCSI_CFG_TARGET_ENABLED            BIT(0)
+#define NVM_ISCSI_CFG_BOOT_TIME_LOGIN_STATUS    BIT(1)
+
+	u32 generic_cont0;					/* 0x4 */
+#define NVM_ISCSI_CFG_TARGET_TCP_PORT_MASK      0x0000FFFF
+#define NVM_ISCSI_CFG_TARGET_TCP_PORT_OFFSET    0
+
+	u32 ip_ver;
+#define NVM_ISCSI_CFG_IPv4       4
+#define NVM_ISCSI_CFG_IPv6       6
+
+	u32 rsvd_1[7];						/* 0x24 */
+	union nvm_iscsi_ipv4_addr ipv4_addr;			/* 0x28 */
+	union nvm_iscsi_ipv6_addr ipv6_addr;			/* 0x2C */
+	union nvm_iscsi_lun lun;				/* 0x3C */
+
+	union nvm_iscsi_name           target_name;		/* 0x44 */
+	union nvm_iscsi_chap_name      chap_name;		/* 0x144 */
+	union nvm_iscsi_chap_password  chap_password;		/* 0x244 */
+
+	u32 rsvd_2[107];					/* 0x2C4 */
+};
+
+struct nvm_iscsi_block {
+	u32 id;							/* 0x0 */
+#define NVM_ISCSI_CFG_BLK_MAPPED_PF_ID_MASK         0x0000000F
+#define NVM_ISCSI_CFG_BLK_MAPPED_PF_ID_OFFSET       0
+#define NVM_ISCSI_CFG_BLK_CTRL_FLAG_MASK            0x00000FF0
+#define NVM_ISCSI_CFG_BLK_CTRL_FLAG_OFFSET          4
+#define NVM_ISCSI_CFG_BLK_CTRL_FLAG_IS_NOT_EMPTY    BIT(0)
+#define NVM_ISCSI_CFG_BLK_CTRL_FLAG_PF_MAPPED       BIT(1)
+
+	u32 rsvd_1[5];						/* 0x4 */
+
+	struct nvm_iscsi_generic     generic;			/* 0x18 */
+	struct nvm_iscsi_initiator   initiator;			/* 0x218 */
+	struct nvm_iscsi_target      target[NUM_OF_ISCSI_TARGET_PER_PF];
+								/* 0x718 */
+
+	u32 rsvd_2[58];						/* 0x1718 */
+	/* total size - 0x1800 - 6K block */
+};
+
+struct nvm_iscsi_cfg {
+	u32 id;							/* 0x0 */
+#define NVM_ISCSI_CFG_BLK_VERSION_MINOR_MASK     0x000000FF
+#define NVM_ISCSI_CFG_BLK_VERSION_MAJOR_MASK     0x0000FF00
+#define NVM_ISCSI_CFG_BLK_SIGNATURE_MASK         0xFFFF0000
+#define NVM_ISCSI_CFG_BLK_SIGNATURE              0x49430000 /* IC - Iscsi
+							     * Config
+							     */
+
+#define NVM_ISCSI_CFG_BLK_VERSION_MAJOR          0
+#define NVM_ISCSI_CFG_BLK_VERSION_MINOR          10
+#define NVM_ISCSI_CFG_BLK_VERSION ((NVM_ISCSI_CFG_BLK_VERSION_MAJOR << 8) | \
+				   NVM_ISCSI_CFG_BLK_VERSION_MINOR)
+
+	struct nvm_iscsi_block	block[NUM_OF_ISCSI_PF_SUPPORTED]; /* 0x4 */
+};
+
+#endif