From 3df54c870f52b4c47b53eead8d22a109f741b91c Mon Sep 17 00:00:00 2001 From: Kelvin Cao Date: Wed, 29 Nov 2017 10:55:24 -0700 Subject: ntb_hw_switchtec: Allow using Switchtec NTB in multi-partition setups Allow using Switchtec NTB in setups that have more than two partitions. Note: this does not enable having multi-host communication, it only allows for a single NTB link between two hosts in a network that might have more than two. Use following logic to determine the NT peer partition: 1) If there are 2 partitions, and the target vector is set in the Switchtec configuration, use the partition specified in target vector. 2) If there are 2 partitions and target vector is unset use the only other partition as specified in the NT EP map. 3) If there are more than 2 partitions and target vector is set use the other partition specified in target vector. 4) If there are more than 2 partitions and target vector is unset, this is invalid and report an error. Signed-off-by: Kelvin Cao [logang@deltatee.com: commit message fleshed out] Signed-off-by: Logan Gunthorpe Reviewed-by: Logan Gunthorpe Signed-off-by: Jon Mason --- include/linux/switchtec.h | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'include/linux') diff --git a/include/linux/switchtec.h b/include/linux/switchtec.h index 09d73d0d1aa8..d4a7c18b42cf 100644 --- a/include/linux/switchtec.h +++ b/include/linux/switchtec.h @@ -168,6 +168,14 @@ struct ntb_info_regs { u16 reserved1; u64 ep_map; u16 requester_id; + u16 reserved2; + u32 reserved3[4]; + struct nt_partition_info { + u32 xlink_enabled; + u32 target_part_low; + u32 target_part_high; + u32 reserved; + } ntp_info[48]; } __packed; struct part_cfg_regs { -- cgit v1.2.3