[PATCH v4 3/7] nvme-fabrics: Add FC transport FC-NVME definitions
James Smart
james.smart at broadcom.com
Fri Nov 4 13:46:59 PDT 2016
nvme-fabrics: Add FC transport FC-NVME definitions:
- Formats for Cmd, Data, Rsp IUs
- Formats FC-4 LS definitions
- cmd_iu changed in T11. The 2 reserved words, previous at words
2 and 3, were moved to after the sqe.
- Add to MAINTAINERS file
Signed-off-by: James Smart <james.smart at broadcom.com>
Reviewed-by: Christoph Hellwig <hch at lst.de>
Reviewed-by: Jay Freyensee <james_p_freyensee at linux.intel.com>
---
v4 mods:
- Sync with FC-NVME v1.11: add RS definitions
MAINTAINERS | 6 +
include/linux/nvme-fc.h | 294 ++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 300 insertions(+)
create mode 100644 include/linux/nvme-fc.h
diff --git a/MAINTAINERS b/MAINTAINERS
index c447953..23a18b2 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -8660,6 +8660,12 @@ L: linux-nvme at lists.infradead.org
S: Supported
F: drivers/nvme/target/
+NVM EXPRESS FC TRANSPORT DRIVERS
+M: James Smart <james.smart at broadcom.com>
+L: linux-nvme at lists.infradead.org
+S: Supported
+F: include/linux/nvme-fc.h
+
NVMEM FRAMEWORK
M: Srinivas Kandagatla <srinivas.kandagatla at linaro.org>
M: Maxime Ripard <maxime.ripard at free-electrons.com>
diff --git a/include/linux/nvme-fc.h b/include/linux/nvme-fc.h
new file mode 100644
index 0000000..7d4d5e3
--- /dev/null
+++ b/include/linux/nvme-fc.h
@@ -0,0 +1,294 @@
+/*
+ * Copyright (c) 2016 Avago Technologies. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful.
+ * ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
+ * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
+ * PARTICULAR PURPOSE, OR NON-INFRINGEMENT, ARE DISCLAIMED, EXCEPT TO
+ * THE EXTENT THAT SUCH DISCLAIMERS ARE HELD TO BE LEGALLY INVALID.
+ * See the GNU General Public License for more details, a copy of which
+ * can be found in the file COPYING included with this package
+ *
+ */
+
+/*
+ * This file contains definitions relative to FC-NVME r1.11 and a few
+ * newer items
+ */
+
+#ifndef _NVME_FC_H
+#define _NVME_FC_H 1
+
+
+#define NVME_CMD_SCSI_ID 0xFD
+#define NVME_CMD_FC_ID FC_TYPE_NVME
+
+/* FC-NVME Cmd IU Flags */
+#define FCNVME_CMD_FLAGS_DIRMASK 0x03
+#define FCNVME_CMD_FLAGS_WRITE 0x01
+#define FCNVME_CMD_FLAGS_READ 0x02
+
+struct nvme_fc_cmd_iu {
+ __u8 scsi_id;
+ __u8 fc_id;
+ __be16 iu_len;
+ __u8 rsvd4[3];
+ __u8 flags;
+ __be64 connection_id;
+ __be32 csn;
+ __be32 data_len;
+ struct nvme_command sqe;
+ __be32 rsvd88[2];
+};
+
+#define NVME_FC_SIZEOF_ZEROS_RSP 12
+
+struct nvme_fc_ersp_iu {
+ __u8 rsvd0[2];
+ __be16 iu_len;
+ __be32 rsn;
+ __be32 xfrd_len;
+ __be32 rsvd12;
+ struct nvme_completion cqe;
+ /* for now - no additional payload */
+};
+
+
+/* FC-NVME r1.03/16-119v0 NVME Link Services */
+enum {
+ FCNVME_LS_RSVD = 0,
+ FCNVME_LS_RJT = 1,
+ FCNVME_LS_ACC = 2,
+ FCNVME_LS_CREATE_ASSOCIATION = 3,
+ FCNVME_LS_CREATE_CONNECTION = 4,
+ FCNVME_LS_DISCONNECT = 5,
+ FCNVME_LS_RS = 6,
+};
+
+/* FC-NVME r1.03/16-119v0 NVME Link Service Descriptors */
+enum {
+ FCNVME_LSDESC_RSVD = 0x0,
+ FCNVME_LSDESC_RQST = 0x1,
+ FCNVME_LSDESC_RJT = 0x2,
+ FCNVME_LSDESC_CREATE_ASSOC_CMD = 0x3,
+ FCNVME_LSDESC_CREATE_CONN_CMD = 0x4,
+ FCNVME_LSDESC_DISCONN_CMD = 0x5,
+ FCNVME_LSDESC_CONN_ID = 0x6,
+ FCNVME_LSDESC_ASSOC_ID = 0x7,
+ FCNVME_LSDESC_RS = 0x8,
+};
+
+
+/* ********** start of Link Service Descriptors ********** */
+
+
+/*
+ * fills in length of a descriptor. Struture minus descriptor header
+ */
+static inline __be32 fcnvme_lsdesc_len(size_t sz)
+{
+ return cpu_to_be32(sz - (2 * sizeof(u32)));
+}
+
+
+struct fcnvme_ls_rqst_w0 {
+ u8 ls_cmd; /* FCNVME_LS_xxx */
+ u8 zeros[3];
+};
+
+/* FCNVME_LSDESC_RQST */
+struct fcnvme_lsdesc_rqst {
+ __be32 desc_tag; /* FCNVME_LSDESC_xxx */
+ __be32 desc_len;
+ struct fcnvme_ls_rqst_w0 w0;
+ __be32 rsvd12;
+};
+
+
+
+
+/* FCNVME_LSDESC_RJT */
+struct fcnvme_lsdesc_rjt {
+ __be32 desc_tag; /* FCNVME_LSDESC_xxx */
+ __be32 desc_len;
+ u8 rsvd8;
+
+ /*
+ * Reject reason and explanaction codes are generic
+ * to ELs's from LS-3.
+ */
+ u8 reason_code;
+ u8 reason_explanation;
+
+ u8 vendor;
+ __be32 rsvd12;
+};
+
+
+#define FCNVME_ASSOC_HOSTID_LEN 64
+#define FCNVME_ASSOC_HOSTNQN_LEN 256
+#define FCNVME_ASSOC_SUBNQN_LEN 256
+
+/* FCNVME_LSDESC_CREATE_ASSOC_CMD */
+struct fcnvme_lsdesc_cr_assoc_cmd {
+ __be32 desc_tag; /* FCNVME_LSDESC_xxx */
+ __be32 desc_len;
+ __be16 ersp_ratio;
+ __be16 rsvd10;
+ __be32 rsvd12[9];
+ __be16 cntlid;
+ __be16 sqsize;
+ __be32 rsvd52;
+ u8 hostid[FCNVME_ASSOC_HOSTID_LEN];
+ u8 hostnqn[FCNVME_ASSOC_HOSTNQN_LEN];
+ u8 subnqn[FCNVME_ASSOC_SUBNQN_LEN];
+ u8 rsvd632[384];
+};
+
+/* FCNVME_LSDESC_CREATE_CONN_CMD */
+struct fcnvme_lsdesc_cr_conn_cmd {
+ __be32 desc_tag; /* FCNVME_LSDESC_xxx */
+ __be32 desc_len;
+ __be16 ersp_ratio;
+ __be16 rsvd10;
+ __be32 rsvd12[9];
+ __be16 qid;
+ __be16 sqsize;
+ __be32 rsvd52;
+};
+
+/* Disconnect Scope Values */
+enum {
+ FCNVME_DISCONN_ASSOCIATION = 0,
+ FCNVME_DISCONN_CONNECTION = 1,
+};
+
+/* FCNVME_LSDESC_DISCONN_CMD */
+struct fcnvme_lsdesc_disconn_cmd {
+ __be32 desc_tag; /* FCNVME_LSDESC_xxx */
+ __be32 desc_len;
+ u8 rsvd8[3];
+ /* note: scope is really a 1 bit field */
+ u8 scope; /* FCNVME_DISCONN_xxx */
+ __be32 rsvd12;
+ __be64 id;
+};
+
+/* FCNVME_LSDESC_CONN_ID */
+struct fcnvme_lsdesc_conn_id {
+ __be32 desc_tag; /* FCNVME_LSDESC_xxx */
+ __be32 desc_len;
+ __be64 connection_id;
+};
+
+/* FCNVME_LSDESC_ASSOC_ID */
+struct fcnvme_lsdesc_assoc_id {
+ __be32 desc_tag; /* FCNVME_LSDESC_xxx */
+ __be32 desc_len;
+ __be64 association_id;
+};
+
+/* r_ctl values */
+enum {
+ FCNVME_RS_RCTL_DATA = 1,
+ FCNVME_RS_RCTL_XFER_RDY = 5,
+ FCNVME_RS_RCTL_RSP = 8,
+};
+
+/* FCNVME_LSDESC_RS */
+struct fcnvme_lsdesc_rs {
+ __be32 desc_tag; /* FCNVME_LSDESC_xxx */
+ __be32 desc_len;
+ __be16 oxid;
+ __be16 rxid;
+ __be32 relative_offset;
+ u8 r_ctl; /* FCNVME_RS_RCTL_xxx */
+ u8 rsvd17[3];
+ __be32 rsvd20;
+};
+
+
+/* ********** start of Link Services ********** */
+
+
+/* FCNVME_LS_RJT */
+struct fcnvme_ls_rjt {
+ struct fcnvme_ls_rqst_w0 w0;
+ __be32 desc_list_len;
+ struct fcnvme_lsdesc_rqst rqst;
+ struct fcnvme_lsdesc_rjt rjt;
+};
+
+/* FCNVME_LS_ACC */
+struct fcnvme_ls_acc_hdr {
+ struct fcnvme_ls_rqst_w0 w0;
+ __be32 desc_list_len;
+ struct fcnvme_lsdesc_rqst rqst;
+ /* Followed by cmd-specific ACC descriptors, see next definitions */
+};
+
+/* FCNVME_LS_CREATE_ASSOCIATION */
+struct fcnvme_ls_cr_assoc_rqst {
+ struct fcnvme_ls_rqst_w0 w0;
+ __be32 desc_list_len;
+ struct fcnvme_lsdesc_cr_assoc_cmd assoc_cmd;
+};
+
+struct fcnvme_ls_cr_assoc_acc {
+ struct fcnvme_ls_acc_hdr hdr;
+ struct fcnvme_lsdesc_assoc_id associd;
+ struct fcnvme_lsdesc_conn_id connectid;
+};
+
+
+/* FCNVME_LS_CREATE_CONNECTION */
+struct fcnvme_ls_cr_conn_rqst {
+ struct fcnvme_ls_rqst_w0 w0;
+ __be32 desc_list_len;
+ struct fcnvme_lsdesc_assoc_id associd;
+ struct fcnvme_lsdesc_cr_conn_cmd connect_cmd;
+};
+
+struct fcnvme_ls_cr_conn_acc {
+ struct fcnvme_ls_acc_hdr hdr;
+ struct fcnvme_lsdesc_conn_id connectid;
+};
+
+/* FCNVME_LS_DISCONNECT */
+struct fcnvme_ls_disconnect_rqst {
+ struct fcnvme_ls_rqst_w0 w0;
+ __be32 desc_list_len;
+ struct fcnvme_lsdesc_assoc_id associd;
+ struct fcnvme_lsdesc_disconn_cmd discon_cmd;
+};
+
+struct fcnvme_ls_disconnect_acc {
+ struct fcnvme_ls_acc_hdr hdr;
+};
+
+/* FCNVME_LS_RS */
+struct fcnvme_ls_rs_rqst {
+ struct fcnvme_ls_rqst_w0 w0;
+ __be32 desc_list_len;
+ struct fcnvme_lsdesc_conn_id connectid;
+ struct fcnvme_lsdesc_rs rs;
+};
+
+struct fcnvme_ls_rs_acc {
+ struct fcnvme_ls_acc_hdr hdr;
+};
+
+
+/*
+ * Yet to be defined in FC-NVME:
+ */
+#define NVME_FC_CONNECT_TIMEOUT_SEC 2 /* 2 seconds */
+#define NVME_FC_LS_TIMEOUT_SEC 2 /* 2 seconds */
+#define NVME_FC_TGTOP_TIMEOUT_SEC 2 /* 2 seconds */
+
+
+#endif /* _NVME_FC_H */
--
2.5.0
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