summaryrefslogtreecommitdiffstats
path: root/net/smc/smc_clc.h
diff options
context:
space:
mode:
Diffstat (limited to 'net/smc/smc_clc.h')
-rw-r--r--net/smc/smc_clc.h116
1 files changed, 116 insertions, 0 deletions
diff --git a/net/smc/smc_clc.h b/net/smc/smc_clc.h
new file mode 100644
index 000000000000..13db8ce177c9
--- /dev/null
+++ b/net/smc/smc_clc.h
@@ -0,0 +1,116 @@
+/*
+ * Shared Memory Communications over RDMA (SMC-R) and RoCE
+ *
+ * CLC (connection layer control) handshake over initial TCP socket to
+ * prepare for RDMA traffic
+ *
+ * Copyright IBM Corp. 2016
+ *
+ * Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com>
+ */
+
+#ifndef _SMC_CLC_H
+#define _SMC_CLC_H
+
+#include <rdma/ib_verbs.h>
+
+#include "smc.h"
+
+#define SMC_CLC_PROPOSAL 0x01
+#define SMC_CLC_ACCEPT 0x02
+#define SMC_CLC_CONFIRM 0x03
+#define SMC_CLC_DECLINE 0x04
+
+/* eye catcher "SMCR" EBCDIC for CLC messages */
+static const char SMC_EYECATCHER[4] = {'\xe2', '\xd4', '\xc3', '\xd9'};
+
+#define SMC_CLC_V1 0x1 /* SMC version */
+#define CLC_WAIT_TIME (6 * HZ) /* max. wait time on clcsock */
+#define SMC_CLC_DECL_MEM 0x01010000 /* insufficient memory resources */
+#define SMC_CLC_DECL_TIMEOUT 0x02000000 /* timeout */
+#define SMC_CLC_DECL_CNFERR 0x03000000 /* configuration error */
+#define SMC_CLC_DECL_IPSEC 0x03030000 /* IPsec usage */
+#define SMC_CLC_DECL_SYNCERR 0x04000000 /* synchronization error */
+#define SMC_CLC_DECL_REPLY 0x06000000 /* reply to a received decline */
+#define SMC_CLC_DECL_INTERR 0x99990000 /* internal error */
+#define SMC_CLC_DECL_TCL 0x02040000 /* timeout w4 QP confirm */
+#define SMC_CLC_DECL_SEND 0x07000000 /* sending problem */
+
+struct smc_clc_msg_hdr { /* header1 of clc messages */
+ u8 eyecatcher[4]; /* eye catcher */
+ u8 type; /* proposal / accept / confirm / decline */
+ __be16 length;
+#if defined(__BIG_ENDIAN_BITFIELD)
+ u8 version : 4,
+ flag : 1,
+ rsvd : 3;
+#elif defined(__LITTLE_ENDIAN_BITFIELD)
+ u8 rsvd : 3,
+ flag : 1,
+ version : 4;
+#endif
+} __packed; /* format defined in RFC7609 */
+
+struct smc_clc_msg_trail { /* trailer of clc messages */
+ u8 eyecatcher[4];
+};
+
+struct smc_clc_msg_local { /* header2 of clc messages */
+ u8 id_for_peer[SMC_SYSTEMID_LEN]; /* unique system id */
+ u8 gid[16]; /* gid of ib_device port */
+ u8 mac[6]; /* mac of ib_device port */
+};
+
+struct smc_clc_msg_proposal { /* clc proposal message */
+ struct smc_clc_msg_hdr hdr;
+ struct smc_clc_msg_local lcl;
+ __be16 iparea_offset; /* offset to IP address information area */
+ __be32 outgoing_subnet; /* subnet mask */
+ u8 prefix_len; /* number of significant bits in mask */
+ u8 reserved[2];
+ u8 ipv6_prefixes_cnt; /* number of IPv6 prefixes in prefix array */
+ struct smc_clc_msg_trail trl; /* eye catcher "SMCR" EBCDIC */
+} __aligned(4);
+
+struct smc_clc_msg_accept_confirm { /* clc accept / confirm message */
+ struct smc_clc_msg_hdr hdr;
+ struct smc_clc_msg_local lcl;
+ u8 qpn[3]; /* QP number */
+ __be32 rmb_rkey; /* RMB rkey */
+ u8 conn_idx; /* Connection index, which RMBE in RMB */
+ __be32 rmbe_alert_token;/* unique connection id */
+#if defined(__BIG_ENDIAN_BITFIELD)
+ u8 rmbe_size : 4, /* RMBE buf size (compressed notation) */
+ qp_mtu : 4; /* QP mtu */
+#elif defined(__LITTLE_ENDIAN_BITFIELD)
+ u8 qp_mtu : 4,
+ rmbe_size : 4;
+#endif
+ u8 reserved;
+ __be64 rmb_dma_addr; /* RMB virtual address */
+ u8 reserved2;
+ u8 psn[3]; /* initial packet sequence number */
+ struct smc_clc_msg_trail trl; /* eye catcher "SMCR" EBCDIC */
+} __packed; /* format defined in RFC7609 */
+
+struct smc_clc_msg_decline { /* clc decline message */
+ struct smc_clc_msg_hdr hdr;
+ u8 id_for_peer[SMC_SYSTEMID_LEN]; /* sender peer_id */
+ __be32 peer_diagnosis; /* diagnosis information */
+ u8 reserved2[4];
+ struct smc_clc_msg_trail trl; /* eye catcher "SMCR" EBCDIC */
+} __aligned(4);
+
+struct smc_sock;
+struct smc_ib_device;
+
+int smc_clc_wait_msg(struct smc_sock *smc, void *buf, int buflen,
+ u8 expected_type);
+int smc_clc_send_decline(struct smc_sock *smc, u32 peer_diag_info,
+ u8 out_of_sync);
+int smc_clc_send_proposal(struct smc_sock *smc, struct smc_ib_device *smcibdev,
+ u8 ibport);
+int smc_clc_send_confirm(struct smc_sock *smc);
+int smc_clc_send_accept(struct smc_sock *smc, int srv_first_contact);
+
+#endif