diff options
Diffstat (limited to 'include/net/sctp/command.h')
-rw-r--r-- | include/net/sctp/command.h | 39 |
1 files changed, 31 insertions, 8 deletions
diff --git a/include/net/sctp/command.h b/include/net/sctp/command.h index 4b7cd69..f22538e 100644 --- a/include/net/sctp/command.h +++ b/include/net/sctp/command.h @@ -118,6 +118,7 @@ typedef enum { #define SCTP_MAX_NUM_COMMANDS 14 typedef union { + void *zero_all; /* Set to NULL to clear the entire union */ __s32 i32; __u32 u32; __be32 be32; @@ -154,7 +155,7 @@ typedef union { static inline sctp_arg_t \ SCTP_## name (type arg) \ { sctp_arg_t retval;\ - memset(&retval, 0, sizeof(sctp_arg_t));\ + retval.zero_all = NULL;\ retval.elt = arg;\ return retval;\ } @@ -191,7 +192,7 @@ static inline sctp_arg_t SCTP_NOFORCE(void) static inline sctp_arg_t SCTP_NULL(void) { sctp_arg_t retval; - memset(&retval, 0, sizeof(sctp_arg_t)); + retval.zero_all = NULL; return retval; } @@ -202,27 +203,49 @@ typedef struct { typedef struct { sctp_cmd_t cmds[SCTP_MAX_NUM_COMMANDS]; - __u8 next_free_slot; - __u8 next_cmd; + sctp_cmd_t *last_used_slot; + sctp_cmd_t *next_cmd; } sctp_cmd_seq_t; /* Initialize a block of memory as a command sequence. * Return 0 if the initialization fails. */ -int sctp_init_cmd_seq(sctp_cmd_seq_t *seq); +static inline int sctp_init_cmd_seq(sctp_cmd_seq_t *seq) +{ + /* cmds[] is filled backwards to simplify the overflow BUG() check */ + seq->last_used_slot = seq->cmds + SCTP_MAX_NUM_COMMANDS; + seq->next_cmd = seq->last_used_slot; + return 1; /* We always succeed. */ +} + /* Add a command to an sctp_cmd_seq_t. * * Use the SCTP_* constructors defined by SCTP_ARG_CONSTRUCTOR() above * to wrap data which goes in the obj argument. */ -void sctp_add_cmd_sf(sctp_cmd_seq_t *seq, sctp_verb_t verb, sctp_arg_t obj); +static inline void sctp_add_cmd_sf(sctp_cmd_seq_t *seq, sctp_verb_t verb, + sctp_arg_t obj) +{ + sctp_cmd_t *cmd = seq->last_used_slot - 1; + + BUG_ON(cmd < seq->cmds); + + cmd->verb = verb; + cmd->obj = obj; + seq->last_used_slot = cmd; +} /* Return the next command structure in an sctp_cmd_seq. * Return NULL at the end of the sequence. */ -sctp_cmd_t *sctp_next_cmd(sctp_cmd_seq_t *seq); +static inline sctp_cmd_t *sctp_next_cmd(sctp_cmd_seq_t *seq) +{ + if (seq->next_cmd <= seq->last_used_slot) + return NULL; -#endif /* __net_sctp_command_h__ */ + return --seq->next_cmd; +} +#endif /* __net_sctp_command_h__ */ |