From 1e5301196a88961b02fe43c73a952f78b2c84712 Mon Sep 17 00:00:00 2001 From: Serge Semin Date: Wed, 14 Dec 2016 02:49:14 +0300 Subject: 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 Signed-off-by: Jon Mason --- drivers/ntb/ntb.c | 54 +++++++++++++++++++++++++++++++++++++++++ drivers/ntb/ntb_transport.c | 6 +++++ drivers/ntb/test/ntb_perf.c | 4 +++ drivers/ntb/test/ntb_pingpong.c | 6 +++++ drivers/ntb/test/ntb_tool.c | 5 ++++ 5 files changed, 75 insertions(+) (limited to 'drivers/ntb') diff --git a/drivers/ntb/ntb.c b/drivers/ntb/ntb.c index 2e2530743831..1e92e52813aa 100644 --- a/drivers/ntb/ntb.c +++ b/drivers/ntb/ntb.c @@ -191,6 +191,60 @@ void ntb_db_event(struct ntb_dev *ntb, int vector) } EXPORT_SYMBOL(ntb_db_event); +int ntb_default_port_number(struct ntb_dev *ntb) +{ + switch (ntb->topo) { + case NTB_TOPO_PRI: + case NTB_TOPO_B2B_USD: + return NTB_PORT_PRI_USD; + case NTB_TOPO_SEC: + case NTB_TOPO_B2B_DSD: + return NTB_PORT_SEC_DSD; + default: + break; + } + + return -EINVAL; +} +EXPORT_SYMBOL(ntb_default_port_number); + +int ntb_default_peer_port_count(struct ntb_dev *ntb) +{ + return NTB_DEF_PEER_CNT; +} +EXPORT_SYMBOL(ntb_default_peer_port_count); + +int ntb_default_peer_port_number(struct ntb_dev *ntb, int pidx) +{ + if (pidx != NTB_DEF_PEER_IDX) + return -EINVAL; + + switch (ntb->topo) { + case NTB_TOPO_PRI: + case NTB_TOPO_B2B_USD: + return NTB_PORT_SEC_DSD; + case NTB_TOPO_SEC: + case NTB_TOPO_B2B_DSD: + return NTB_PORT_PRI_USD; + default: + break; + } + + return -EINVAL; +} +EXPORT_SYMBOL(ntb_default_peer_port_number); + +int ntb_default_peer_port_idx(struct ntb_dev *ntb, int port) +{ + int peer_port = ntb_default_peer_port_number(ntb, NTB_DEF_PEER_IDX); + + if (peer_port == -EINVAL || port != peer_port) + return -EINVAL; + + return 0; +} +EXPORT_SYMBOL(ntb_default_peer_port_idx); + static int ntb_probe(struct device *dev) { struct ntb_dev *ntb; diff --git a/drivers/ntb/ntb_transport.c b/drivers/ntb/ntb_transport.c index 10e5bf460139..cc6ae35109b1 100644 --- a/drivers/ntb/ntb_transport.c +++ b/drivers/ntb/ntb_transport.c @@ -95,6 +95,9 @@ MODULE_PARM_DESC(use_dma, "Use DMA engine to perform large data copy"); static struct dentry *nt_debugfs_dir; +/* Only two-ports NTB devices are supported */ +#define PIDX NTB_DEF_PEER_IDX + struct ntb_queue_entry { /* ntb_queue list reference */ struct list_head entry; @@ -1064,6 +1067,9 @@ static int ntb_transport_probe(struct ntb_client *self, struct ntb_dev *ndev) dev_dbg(&ndev->dev, "scratchpad is unsafe, proceed anyway...\n"); + if (ntb_peer_port_count(ndev) != NTB_DEF_PEER_CNT) + dev_warn(&ndev->dev, "Multi-port NTB devices unsupported\n"); + node = dev_to_node(&ndev->dev); nt = kzalloc_node(sizeof(*nt), GFP_KERNEL, node); diff --git a/drivers/ntb/test/ntb_perf.c b/drivers/ntb/test/ntb_perf.c index 5cab2831ce99..e52cc4eace90 100644 --- a/drivers/ntb/test/ntb_perf.c +++ b/drivers/ntb/test/ntb_perf.c @@ -76,6 +76,7 @@ #define DMA_RETRIES 20 #define SZ_4G (1ULL << 32) #define MAX_SEG_ORDER 20 /* no larger than 1M for kmalloc buffer */ +#define PIDX NTB_DEF_PEER_IDX MODULE_LICENSE(DRIVER_LICENSE); MODULE_VERSION(DRIVER_VERSION); @@ -766,6 +767,9 @@ static int perf_probe(struct ntb_client *client, struct ntb_dev *ntb) return -EIO; } + if (ntb_peer_port_count(ntb) != NTB_DEF_PEER_CNT) + dev_warn(&ntb->dev, "Multi-port NTB devices unsupported\n"); + node = dev_to_node(&pdev->dev); perf = kzalloc_node(sizeof(*perf), GFP_KERNEL, node); 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; diff --git a/drivers/ntb/test/ntb_tool.c b/drivers/ntb/test/ntb_tool.c index 61bf2ef87e0e..690862d90411 100644 --- a/drivers/ntb/test/ntb_tool.c +++ b/drivers/ntb/test/ntb_tool.c @@ -120,6 +120,8 @@ MODULE_AUTHOR(DRIVER_AUTHOR); MODULE_DESCRIPTION(DRIVER_DESCRIPTION); #define MAX_MWS 16 +/* Only two-ports devices are supported */ +#define PIDX NTB_DEF_PEER_IDX static struct dentry *tool_dbgfs; @@ -919,6 +921,9 @@ static int tool_probe(struct ntb_client *self, struct ntb_dev *ntb) if (ntb_spad_is_unsafe(ntb)) dev_dbg(&ntb->dev, "scratchpad is unsafe\n"); + if (ntb_peer_port_count(ntb) != NTB_DEF_PEER_CNT) + dev_warn(&ntb->dev, "multi-port NTB is unsupported\n"); + tc = kzalloc(sizeof(*tc), GFP_KERNEL); if (!tc) { rc = -ENOMEM; -- cgit v1.2.3