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authorUrsula Braun <ubraun@linux.vnet.ibm.com>2017-01-09 16:55:22 +0100
committerDavid S. Miller <davem@davemloft.net>2017-01-09 16:07:40 -0500
commit5f08318f617b05b6ee389d8bd174c7af921ebf19 (patch)
treea9cb73bf47554bd92ad3e9861a49683df2c11ab9 /net/smc/smc.h
parent9bf9abead28abaf11d0776b6e0c5d34b6525e846 (diff)
downloadlinux-5f08318f617b05b6ee389d8bd174c7af921ebf19.tar.bz2
smc: connection data control (CDC)
send and receive CDC messages (via IB message send and CQE) Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/smc/smc.h')
-rw-r--r--net/smc/smc.h97
1 files changed, 97 insertions, 0 deletions
diff --git a/net/smc/smc.h b/net/smc/smc.h
index 4d2e54d176f2..a8d4a68aac30 100644
--- a/net/smc/smc.h
+++ b/net/smc/smc.h
@@ -21,6 +21,10 @@
#define SMC_MAX_PORTS 2 /* Max # of ports */
+#ifdef ATOMIC64_INIT
+#define KERNEL_HAS_ATOMIC64
+#endif
+
enum smc_state { /* possible states of an SMC socket */
SMC_ACTIVE = 1,
SMC_INIT = 2,
@@ -34,6 +38,67 @@ struct smc_wr_rx_hdr { /* common prefix part of LLC and CDC to demultiplex */
u8 type;
} __aligned(1);
+struct smc_cdc_conn_state_flags {
+#if defined(__BIG_ENDIAN_BITFIELD)
+ u8 peer_done_writing : 1; /* Sending done indicator */
+ u8 peer_conn_closed : 1; /* Peer connection closed indicator */
+ u8 peer_conn_abort : 1; /* Abnormal close indicator */
+ u8 reserved : 5;
+#elif defined(__LITTLE_ENDIAN_BITFIELD)
+ u8 reserved : 5;
+ u8 peer_conn_abort : 1;
+ u8 peer_conn_closed : 1;
+ u8 peer_done_writing : 1;
+#endif
+};
+
+struct smc_cdc_producer_flags {
+#if defined(__BIG_ENDIAN_BITFIELD)
+ u8 write_blocked : 1; /* Writing Blocked, no rx buf space */
+ u8 urg_data_pending : 1; /* Urgent Data Pending */
+ u8 urg_data_present : 1; /* Urgent Data Present */
+ u8 cons_curs_upd_req : 1; /* cursor update requested */
+ u8 failover_validation : 1;/* message replay due to failover */
+ u8 reserved : 3;
+#elif defined(__LITTLE_ENDIAN_BITFIELD)
+ u8 reserved : 3;
+ u8 failover_validation : 1;
+ u8 cons_curs_upd_req : 1;
+ u8 urg_data_present : 1;
+ u8 urg_data_pending : 1;
+ u8 write_blocked : 1;
+#endif
+};
+
+/* in host byte order */
+union smc_host_cursor { /* SMC cursor - an offset in an RMBE */
+ struct {
+ u16 reserved;
+ u16 wrap; /* window wrap sequence number */
+ u32 count; /* cursor (= offset) part */
+ };
+#ifdef KERNEL_HAS_ATOMIC64
+ atomic64_t acurs; /* for atomic processing */
+#else
+ u64 acurs; /* for atomic processing */
+#endif
+} __aligned(8);
+
+/* in host byte order, except for flag bitfields in network byte order */
+struct smc_host_cdc_msg { /* Connection Data Control message */
+ struct smc_wr_rx_hdr common; /* .type = 0xFE */
+ u8 len; /* length = 44 */
+ u16 seqno; /* connection seq # */
+ u32 token; /* alert_token */
+ union smc_host_cursor prod; /* producer cursor */
+ union smc_host_cursor cons; /* consumer cursor,
+ * piggy backed "ack"
+ */
+ struct smc_cdc_producer_flags prod_flags; /* conn. tx/rx status */
+ struct smc_cdc_conn_state_flags conn_state_flags; /* peer conn. status*/
+ u8 reserved[18];
+} __aligned(8);
+
struct smc_connection {
struct rb_node alert_node;
struct smc_link_group *lgr; /* link group of connection */
@@ -50,6 +115,38 @@ struct smc_connection {
struct smc_buf_desc *rmb_desc; /* RMBE descriptor */
int rmbe_size; /* RMBE size <== sock rmem */
int rmbe_size_short;/* compressed notation */
+
+ struct smc_host_cdc_msg local_tx_ctrl; /* host byte order staging
+ * buffer for CDC msg send
+ * .prod cf. TCP snd_nxt
+ * .cons cf. TCP sends ack
+ */
+ union smc_host_cursor tx_curs_prep; /* tx - prepared data
+ * snd_max..wmem_alloc
+ */
+ union smc_host_cursor tx_curs_sent; /* tx - sent data
+ * snd_nxt ?
+ */
+ union smc_host_cursor tx_curs_fin; /* tx - confirmed by peer
+ * snd-wnd-begin ?
+ */
+ atomic_t sndbuf_space; /* remaining space in sndbuf */
+ u16 tx_cdc_seq; /* sequence # for CDC send */
+ spinlock_t send_lock; /* protect wr_sends */
+
+ struct smc_host_cdc_msg local_rx_ctrl; /* filled during event_handl.
+ * .prod cf. TCP rcv_nxt
+ * .cons cf. TCP snd_una
+ */
+ union smc_host_cursor rx_curs_confirmed; /* confirmed to peer
+ * source of snd_una ?
+ */
+ atomic_t bytes_to_rcv; /* arrived data,
+ * not yet received
+ */
+#ifndef KERNEL_HAS_ATOMIC64
+ spinlock_t acurs_lock; /* protect cursors */
+#endif
};
struct smc_sock { /* smc sock container */