diff options
| -rw-r--r-- | include/linux/ntb.h | 53 |
1 files changed, 52 insertions, 1 deletions
diff --git a/include/linux/ntb.h b/include/linux/ntb.h index 604abc883741..2fadd0352683 100644 --- a/include/linux/ntb.h +++ b/include/linux/ntb.h @@ -616,7 +616,6 @@ static inline int ntb_port_number(struct ntb_dev *ntb) return ntb->ops->port_number(ntb); } - /** * ntb_peer_port_count() - get the number of peer device ports * @ntb: NTB device context. @@ -654,6 +653,58 @@ static inline int ntb_peer_port_number(struct ntb_dev *ntb, int pidx) } /** + * ntb_logical_port_number() - get the logical port number of the local port + * @ntb: NTB device context. + * + * The Logical Port Number is defined to be a unique number for each + * port starting from zero through to the number of ports minus one. + * This is in contrast to the Port Number where each port can be assigned + * any unique physical number by the hardware. + * + * The logical port number is useful for calculating the resource indexes + * used by peers. + * + * Return: the logical port number or negative value indicating an error + */ +static inline int ntb_logical_port_number(struct ntb_dev *ntb) +{ + int lport = ntb_port_number(ntb); + int pidx; + + if (lport < 0) + return lport; + + for (pidx = 0; pidx < ntb_peer_port_count(ntb); pidx++) + if (lport <= ntb_peer_port_number(ntb, pidx)) + return pidx; + + return pidx; +} + +/** + * ntb_peer_logical_port_number() - get the logical peer port by given index + * @ntb: NTB device context. + * @pidx: Peer port index. + * + * The Logical Port Number is defined to be a unique number for each + * port starting from zero through to the number of ports minus one. + * This is in contrast to the Port Number where each port can be assigned + * any unique physical number by the hardware. + * + * The logical port number is useful for calculating the resource indexes + * used by peers. + * + * Return: the peer's logical port number or negative value indicating an error + */ +static inline int ntb_peer_logical_port_number(struct ntb_dev *ntb, int pidx) +{ + if (ntb_peer_port_number(ntb, pidx) < ntb_port_number(ntb)) + return pidx; + else + return pidx + 1; +} + +/** * ntb_peer_port_idx() - get the peer device port index by given port number * @ntb: NTB device context. * @port: Peer port number. |