/* * Shared Memory Communications over RDMA (SMC-R) and RoCE * * Connection Data Control (CDC) * * Copyright IBM Corp. 2016 * * Author(s): Ursula Braun */ #ifndef SMC_CDC_H #define SMC_CDC_H #include /* max_t */ #include #include #include #include "smc.h" #include "smc_core.h" #include "smc_wr.h" #define SMC_CDC_MSG_TYPE 0xFE /* in network byte order */ union smc_cdc_cursor { /* SMC cursor */ struct { __be16 reserved; __be16 wrap; __be32 count; }; #ifdef KERNEL_HAS_ATOMIC64 atomic64_t acurs; /* for atomic processing */ #else u64 acurs; /* for atomic processing */ #endif } __aligned(8); /* in network byte order */ struct smc_cdc_msg { struct smc_wr_rx_hdr common; /* .type = 0xFE */ u8 len; /* 44 */ __be16 seqno; __be32 token; union smc_cdc_cursor prod; union smc_cdc_cursor cons; /* piggy backed "ack" */ struct smc_cdc_producer_flags prod_flags; struct smc_cdc_conn_state_flags conn_state_flags; u8 reserved[18]; } __aligned(8); static inline bool smc_cdc_rxed_any_close(struct smc_connection *conn) { return conn->local_rx_ctrl.conn_state_flags.peer_conn_abort || conn->local_rx_ctrl.conn_state_flags.peer_conn_closed; } static inline bool smc_cdc_rxed_any_close_or_senddone( struct smc_connection *conn) { return smc_cdc_rxed_any_close(conn) || conn->local_rx_ctrl.conn_state_flags.peer_done_writing; } static inline void smc_curs_add(int size, union smc_host_cursor *curs, int value) { curs->count += value; if (curs->count >= size) { curs->wrap++; curs->count -= size; } } /* SMC cursors are 8 bytes long and require atomic reading and writing */ static inline u64 smc_curs_read(union smc_host_cursor *curs, struct smc_connection *conn) { #ifndef KERNEL_HAS_ATOMIC64 unsigned long flags; u64 ret; spin_lock_irqsave(&conn->acurs_lock, flags); ret = curs->acurs; spin_unlock_irqrestore(&conn->acurs_lock, flags); return ret; #else return atomic64_read(&curs->acurs); #endif } static inline u64 smc_curs_read_net(union smc_cdc_cursor *curs, struct smc_connection *conn) { #ifndef KERNEL_HAS_ATOMIC64 unsigned long flags; u64 ret; spin_lock_irqsave(&conn->acurs_lock, flags); ret = curs->acurs; spin_unlock_irqrestore(&conn->acurs_lock, flags); return ret; #else return atomic64_read(&curs->acurs); #endif } static inline void smc_curs_write(union smc_host_cursor *curs, u64 val, struct smc_connection *conn) { #ifndef KERNEL_HAS_ATOMIC64 unsigned long flags; spin_lock_irqsave(&conn->acurs_lock, flags); curs->acurs = val; spin_unlock_irqrestore(&conn->acurs_lock, flags); #else atomic64_set(&curs->acurs, val); #endif } static inline void smc_curs_write_net(union smc_cdc_cursor *curs, u64 val, struct smc_connection *conn) { #ifndef KERNEL_HAS_ATOMIC64 unsigned long flags; spin_lock_irqsave(&conn->acurs_lock, flags); curs->acurs = val; spin_unlock_irqrestore(&conn->acurs_lock, flags); #else atomic64_set(&curs->acurs, val); #endif } /* calculate cursor difference between old and new, where old <= new */ static inline int smc_curs_diff(unsigned int size, union smc_host_cursor *old, union smc_host_cursor *new) { if (old->wrap != new->wrap) return max_t(int, 0, ((size - old->count) + new->count)); return max_t(int, 0, (new->count - old->count)); } static inline void smc_host_cursor_to_cdc(union smc_cdc_cursor *peer, union smc_host_cursor *local, struct smc_connection *conn) { union smc_host_cursor temp; smc_curs_write(&temp, smc_curs_read(local, conn), conn); peer->count = htonl(temp.count); peer->wrap = htons(temp.wrap); /* peer->reserved = htons(0); must be ensured by caller */ } static inline void smc_host_msg_to_cdc(struct smc_cdc_msg *peer, struct smc_host_cdc_msg *local, struct smc_connection *conn) { peer->common.type = local->common.type; peer->len = local->len; peer->seqno = htons(local->seqno); peer->token = htonl(local->token); smc_host_cursor_to_cdc(&peer->prod, &local->prod, conn); smc_host_cursor_to_cdc(&peer->cons, &local->cons, conn); peer->prod_flags = local->prod_flags; peer->conn_state_flags = local->conn_state_flags; } static inline void smc_cdc_cursor_to_host(union smc_host_cursor *local, union smc_cdc_cursor *peer, struct smc_connection *conn) { union smc_host_cursor temp, old; union smc_cdc_cursor net; smc_curs_write(&old, smc_curs_read(local, conn), conn); smc_curs_write_net(&net, smc_curs_read_net(peer, conn), conn); temp.count = ntohl(net.count); temp.wrap = ntohs(net.wrap); if ((old.wrap > temp.wrap) && temp.wrap) return; if ((old.wrap == temp.wrap) && (old.count > temp.count)) return; smc_curs_write(local, smc_curs_read(&temp, conn), conn); } static inline void smc_cdc_msg_to_host(struct smc_host_cdc_msg *local, struct smc_cdc_msg *peer, struct smc_connection *conn) { local->common.type = peer->common.type; local->len = peer->len; local->seqno = ntohs(peer->seqno); local->token = ntohl(peer->token); smc_cdc_cursor_to_host(&local->prod, &peer->prod, conn); smc_cdc_cursor_to_host(&local->cons, &peer->cons, conn); local->prod_flags = peer->prod_flags; local->conn_state_flags = peer->conn_state_flags; } struct smc_cdc_tx_pend; int smc_cdc_get_free_slot(struct smc_link *link, struct smc_wr_buf **wr_buf, struct smc_cdc_tx_pend **pend); void smc_cdc_tx_dismiss_slots(struct smc_connection *conn); int smc_cdc_msg_send(struct smc_connection *conn, struct smc_wr_buf *wr_buf, struct smc_cdc_tx_pend *pend); int smc_cdc_get_slot_and_msg_send(struct smc_connection *conn); bool smc_cdc_tx_has_pending(struct smc_connection *conn); int smc_cdc_init(void) __init; #endif /* SMC_CDC_H */ for TPACKET_V3
Commit 7f953ab2ba46 ("af_packet: TX_RING support for TPACKET_V3") now makes it possible to use TX_RING with TPACKET_V3, so make the the relevant information available via 'ss -e -a --packet' Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/irda/irnet')