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| author | Serge Semin <fancer.lancer@gmail.com> | 2016-12-14 02:49:14 +0300 |
|---|---|---|
| committer | Jon Mason <jdmason@kudzu.us> | 2017-07-06 18:30:07 +0300 |
| commit | 1e5301196a88961b02fe43c73a952f78b2c84712 (patch) | |
| tree | e7ea5ccf325709d0af0faf6d4f177d44a89f3371 /drivers/ntb/test/ntb_pingpong.c | |
| parent | 60934b200ddd62187b149a7f32cc0f160c08a7ed (diff) | |
| download | linux-1e5301196a88961b02fe43c73a952f78b2c84712.tar.xz | |
NTB: Add indexed ports NTB API
There is some NTB hardware, which can combine more than just two domains
over NTB. For instance, some IDT PCIe-switches can have NTB-functions
activated on more than two-ports. The different domains are distinguished
by ports they are connected to. So the new port-related methods are added to
the NTB API:
ntb_port_number() - return local port
ntb_peer_port_count() - return number of peers local port can connect to
ntb_peer_port_number(pdix) - return port number by it index
ntb_peer_port_idx(port) - return port index by it number
Current test-drivers aren't changed much. They still support two-ports devices
for the time being while multi-ports hardware drivers aren't added.
By default port-related API is declared for two-ports hardware.
So corresponding hardware drivers won't need to implement it.
Signed-off-by: Serge Semin <fancer.lancer@gmail.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>
Diffstat (limited to 'drivers/ntb/test/ntb_pingpong.c')
| -rw-r--r-- | drivers/ntb/test/ntb_pingpong.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/ntb/test/ntb_pingpong.c b/drivers/ntb/test/ntb_pingpong.c index 435861189d97..12f8b40cb11a 100644 --- a/drivers/ntb/test/ntb_pingpong.c +++ b/drivers/ntb/test/ntb_pingpong.c @@ -90,6 +90,9 @@ static unsigned long db_init = 0x7; module_param(db_init, ulong, 0644); MODULE_PARM_DESC(db_init, "Initial doorbell bits to ring on the peer"); +/* Only two-ports NTB devices are supported */ +#define PIDX NTB_DEF_PEER_IDX + struct pp_ctx { struct ntb_dev *ntb; u64 db_bits; @@ -230,6 +233,9 @@ static int pp_probe(struct ntb_client *client, } } + if (ntb_peer_port_count(ntb) != NTB_DEF_PEER_CNT) + dev_warn(&ntb->dev, "multi-port NTB is unsupported\n"); + pp = kmalloc(sizeof(*pp), GFP_KERNEL); if (!pp) { rc = -ENOMEM; |