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authorSerge Semin <fancer.lancer@gmail.com>2016-12-20 10:48:20 +0100
committerJon Mason <jdmason@kudzu.us>2017-07-06 17:30:07 +0200
commitbc3e49adc279c5505d6df8dd8c7fca45d6d3d21a (patch)
tree565b2b2bcbc04243e69661e6d067a8ada86517ac /Documentation/ntb.txt
parentNTB: Alter Scratchpads API to support multi-ports devices (diff)
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NTB: Add Messaging NTB API
Some IDT NTB-capable PCIe-switches have message registers to communicate with peer devices. This patch adds new NTB API callback methods, which can be used to utilize these registers functionality: ntb_msg_count(); - get number of message registers ntb_msg_inbits(); - get bitfield of inbound message registers status ntb_msg_outbits(); - get bitfield of outbound message registers status ntb_msg_read_sts(); - read the inbound and outbound message registers status ntb_msg_clear_sts(); - clear status bits of message registers ntb_msg_set_mask(); - mask interrupts raised by status bits of message registers. ntb_msg_clear_mask(); - clear interrupts mask bits of message registers ntb_msg_read(midx, *pidx); - read message register with specified index, additionally getting peer port index which data received from ntb_msg_write(midx, pidx); - write data to the specified message register sending it to the passed peer device connected over a pidx port ntb_msg_event(); - notify driver context of a new message event Of course there is hardware which doesn't support Message registers, so this API is made optional. Signed-off-by: Serge Semin <fancer.lancer@gmail.com> Acked-by: Allen Hubbe <Allen.Hubbe@dell.com> Signed-off-by: Jon Mason <jdmason@kudzu.us>
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