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305 lines
8.3 KiB
305 lines
8.3 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* Shared Memory Communications over RDMA (SMC-R) and RoCE |
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* |
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* Connection Data Control (CDC) |
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* |
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* Copyright IBM Corp. 2016 |
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* |
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* Author(s): Ursula Braun <[email protected]> |
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*/ |
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#ifndef SMC_CDC_H |
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#define SMC_CDC_H |
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#include <linux/kernel.h> /* max_t */ |
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#include <linux/atomic.h> |
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#include <linux/in.h> |
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#include <linux/compiler.h> |
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#include "smc.h" |
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#include "smc_core.h" |
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#include "smc_wr.h" |
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#define SMC_CDC_MSG_TYPE 0xFE |
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/* in network byte order */ |
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union smc_cdc_cursor { /* SMC cursor */ |
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struct { |
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__be16 reserved; |
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__be16 wrap; |
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__be32 count; |
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}; |
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#ifdef KERNEL_HAS_ATOMIC64 |
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atomic64_t acurs; /* for atomic processing */ |
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#else |
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u64 acurs; /* for atomic processing */ |
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#endif |
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} __aligned(8); |
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/* in network byte order */ |
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struct smc_cdc_msg { |
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struct smc_wr_rx_hdr common; /* .type = 0xFE */ |
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u8 len; /* 44 */ |
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__be16 seqno; |
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__be32 token; |
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union smc_cdc_cursor prod; |
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union smc_cdc_cursor cons; /* piggy backed "ack" */ |
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struct smc_cdc_producer_flags prod_flags; |
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struct smc_cdc_conn_state_flags conn_state_flags; |
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u8 reserved[18]; |
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}; |
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/* SMC-D cursor format */ |
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union smcd_cdc_cursor { |
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struct { |
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u16 wrap; |
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u32 count; |
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struct smc_cdc_producer_flags prod_flags; |
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struct smc_cdc_conn_state_flags conn_state_flags; |
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} __packed; |
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#ifdef KERNEL_HAS_ATOMIC64 |
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atomic64_t acurs; /* for atomic processing */ |
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#else |
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u64 acurs; /* for atomic processing */ |
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#endif |
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} __aligned(8); |
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/* CDC message for SMC-D */ |
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struct smcd_cdc_msg { |
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struct smc_wr_rx_hdr common; /* Type = 0xFE */ |
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u8 res1[7]; |
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union smcd_cdc_cursor prod; |
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union smcd_cdc_cursor cons; |
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u8 res3[8]; |
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} __aligned(8); |
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static inline bool smc_cdc_rxed_any_close(struct smc_connection *conn) |
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{ |
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return conn->local_rx_ctrl.conn_state_flags.peer_conn_abort || |
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conn->local_rx_ctrl.conn_state_flags.peer_conn_closed; |
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} |
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static inline bool smc_cdc_rxed_any_close_or_senddone( |
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struct smc_connection *conn) |
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{ |
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return smc_cdc_rxed_any_close(conn) || |
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conn->local_rx_ctrl.conn_state_flags.peer_done_writing; |
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} |
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static inline void smc_curs_add(int size, union smc_host_cursor *curs, |
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int value) |
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{ |
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curs->count += value; |
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if (curs->count >= size) { |
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curs->wrap++; |
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curs->count -= size; |
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} |
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} |
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/* Copy cursor src into tgt */ |
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static inline void smc_curs_copy(union smc_host_cursor *tgt, |
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union smc_host_cursor *src, |
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struct smc_connection *conn) |
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{ |
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#ifndef KERNEL_HAS_ATOMIC64 |
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unsigned long flags; |
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spin_lock_irqsave(&conn->acurs_lock, flags); |
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tgt->acurs = src->acurs; |
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spin_unlock_irqrestore(&conn->acurs_lock, flags); |
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#else |
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atomic64_set(&tgt->acurs, atomic64_read(&src->acurs)); |
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#endif |
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} |
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static inline void smc_curs_copy_net(union smc_cdc_cursor *tgt, |
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union smc_cdc_cursor *src, |
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struct smc_connection *conn) |
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{ |
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#ifndef KERNEL_HAS_ATOMIC64 |
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unsigned long flags; |
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spin_lock_irqsave(&conn->acurs_lock, flags); |
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tgt->acurs = src->acurs; |
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spin_unlock_irqrestore(&conn->acurs_lock, flags); |
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#else |
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atomic64_set(&tgt->acurs, atomic64_read(&src->acurs)); |
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#endif |
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} |
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static inline void smcd_curs_copy(union smcd_cdc_cursor *tgt, |
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union smcd_cdc_cursor *src, |
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struct smc_connection *conn) |
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{ |
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#ifndef KERNEL_HAS_ATOMIC64 |
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unsigned long flags; |
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spin_lock_irqsave(&conn->acurs_lock, flags); |
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tgt->acurs = src->acurs; |
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spin_unlock_irqrestore(&conn->acurs_lock, flags); |
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#else |
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atomic64_set(&tgt->acurs, atomic64_read(&src->acurs)); |
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#endif |
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} |
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/* calculate cursor difference between old and new, where old <= new and |
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* difference cannot exceed size |
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*/ |
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static inline int smc_curs_diff(unsigned int size, |
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union smc_host_cursor *old, |
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union smc_host_cursor *new) |
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{ |
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if (old->wrap != new->wrap) |
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return max_t(int, 0, |
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((size - old->count) + new->count)); |
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return max_t(int, 0, (new->count - old->count)); |
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} |
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/* calculate cursor difference between old and new - returns negative |
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* value in case old > new |
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*/ |
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static inline int smc_curs_comp(unsigned int size, |
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union smc_host_cursor *old, |
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union smc_host_cursor *new) |
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{ |
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if (old->wrap > new->wrap || |
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(old->wrap == new->wrap && old->count > new->count)) |
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return -smc_curs_diff(size, new, old); |
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return smc_curs_diff(size, old, new); |
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} |
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/* calculate cursor difference between old and new, where old <= new and |
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* difference may exceed size |
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*/ |
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static inline int smc_curs_diff_large(unsigned int size, |
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union smc_host_cursor *old, |
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union smc_host_cursor *new) |
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{ |
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if (old->wrap < new->wrap) |
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return min_t(int, |
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(size - old->count) + new->count + |
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(new->wrap - old->wrap - 1) * size, |
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size); |
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if (old->wrap > new->wrap) /* wrap has switched from 0xffff to 0x0000 */ |
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return min_t(int, |
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(size - old->count) + new->count + |
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(new->wrap + 0xffff - old->wrap) * size, |
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size); |
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return max_t(int, 0, (new->count - old->count)); |
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} |
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static inline void smc_host_cursor_to_cdc(union smc_cdc_cursor *peer, |
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union smc_host_cursor *local, |
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union smc_host_cursor *save, |
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struct smc_connection *conn) |
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{ |
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smc_curs_copy(save, local, conn); |
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peer->count = htonl(save->count); |
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peer->wrap = htons(save->wrap); |
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/* peer->reserved = htons(0); must be ensured by caller */ |
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} |
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static inline void smc_host_msg_to_cdc(struct smc_cdc_msg *peer, |
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struct smc_connection *conn, |
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union smc_host_cursor *save) |
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{ |
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struct smc_host_cdc_msg *local = &conn->local_tx_ctrl; |
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peer->common.type = local->common.type; |
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peer->len = local->len; |
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peer->seqno = htons(local->seqno); |
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peer->token = htonl(local->token); |
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smc_host_cursor_to_cdc(&peer->prod, &local->prod, save, conn); |
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smc_host_cursor_to_cdc(&peer->cons, &local->cons, save, conn); |
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peer->prod_flags = local->prod_flags; |
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peer->conn_state_flags = local->conn_state_flags; |
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} |
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static inline void smc_cdc_cursor_to_host(union smc_host_cursor *local, |
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union smc_cdc_cursor *peer, |
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struct smc_connection *conn) |
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{ |
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union smc_host_cursor temp, old; |
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union smc_cdc_cursor net; |
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smc_curs_copy(&old, local, conn); |
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smc_curs_copy_net(&net, peer, conn); |
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temp.count = ntohl(net.count); |
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temp.wrap = ntohs(net.wrap); |
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if ((old.wrap > temp.wrap) && temp.wrap) |
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return; |
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if ((old.wrap == temp.wrap) && |
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(old.count > temp.count)) |
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return; |
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smc_curs_copy(local, &temp, conn); |
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} |
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static inline void smcr_cdc_msg_to_host(struct smc_host_cdc_msg *local, |
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struct smc_cdc_msg *peer, |
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struct smc_connection *conn) |
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{ |
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local->common.type = peer->common.type; |
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local->len = peer->len; |
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local->seqno = ntohs(peer->seqno); |
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local->token = ntohl(peer->token); |
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smc_cdc_cursor_to_host(&local->prod, &peer->prod, conn); |
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smc_cdc_cursor_to_host(&local->cons, &peer->cons, conn); |
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local->prod_flags = peer->prod_flags; |
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local->conn_state_flags = peer->conn_state_flags; |
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} |
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static inline void smcd_cdc_msg_to_host(struct smc_host_cdc_msg *local, |
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struct smcd_cdc_msg *peer, |
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struct smc_connection *conn) |
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{ |
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union smc_host_cursor temp; |
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temp.wrap = peer->prod.wrap; |
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temp.count = peer->prod.count; |
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smc_curs_copy(&local->prod, &temp, conn); |
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temp.wrap = peer->cons.wrap; |
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temp.count = peer->cons.count; |
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smc_curs_copy(&local->cons, &temp, conn); |
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local->prod_flags = peer->cons.prod_flags; |
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local->conn_state_flags = peer->cons.conn_state_flags; |
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} |
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static inline void smc_cdc_msg_to_host(struct smc_host_cdc_msg *local, |
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struct smc_cdc_msg *peer, |
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struct smc_connection *conn) |
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{ |
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if (conn->lgr->is_smcd) |
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smcd_cdc_msg_to_host(local, (struct smcd_cdc_msg *)peer, conn); |
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else |
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smcr_cdc_msg_to_host(local, peer, conn); |
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} |
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struct smc_cdc_tx_pend { |
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struct smc_connection *conn; /* socket connection */ |
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union smc_host_cursor cursor; /* tx sndbuf cursor sent */ |
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union smc_host_cursor p_cursor; /* rx RMBE cursor produced */ |
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u16 ctrl_seq; /* conn. tx sequence # */ |
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}; |
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int smc_cdc_get_free_slot(struct smc_connection *conn, |
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struct smc_link *link, |
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struct smc_wr_buf **wr_buf, |
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struct smc_rdma_wr **wr_rdma_buf, |
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struct smc_cdc_tx_pend **pend); |
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void smc_cdc_tx_dismiss_slots(struct smc_connection *conn); |
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int smc_cdc_msg_send(struct smc_connection *conn, struct smc_wr_buf *wr_buf, |
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struct smc_cdc_tx_pend *pend); |
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int smc_cdc_get_slot_and_msg_send(struct smc_connection *conn); |
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int smcd_cdc_msg_send(struct smc_connection *conn); |
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int smcr_cdc_msg_send_validation(struct smc_connection *conn, |
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struct smc_cdc_tx_pend *pend, |
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struct smc_wr_buf *wr_buf); |
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int smc_cdc_init(void) __init; |
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void smcd_cdc_rx_init(struct smc_connection *conn); |
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#endif /* SMC_CDC_H */
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