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IB/ipath: Driver support for userspace sharing of HW contexts

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This allows multiple userspace processes to share a single hardware
context in a master/slave arrangement.  It is backwards binary compatible
with existing userspace.

Signed-off-by: Bryan O'Sullivan <bryan.osullivan@qlogic.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Bryan O'Sullivan
2006-09-28 08:59:59 -07:00
committed by Roland Dreier
parent 221e31985b
commit 9929b0fb0f
5 changed files with 759 additions and 246 deletions
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30
drivers/infiniband/hw/ipath/ipath_kernel.h
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@@ -79,8 +79,8 @@ struct ipath_portdata {
dma_addr_t port_rcvhdrq_phys;
dma_addr_t port_rcvhdrqtailaddr_phys;
/*
* number of opens on this instance (0 or 1; ignoring forks, dup,
* etc. for now)
* number of opens (including slave subports) on this instance
* (ignoring forks, dup, etc. for now)
*/
int port_cnt;
/*
@@ -89,6 +89,10 @@ struct ipath_portdata {
*/
/* instead of calculating it */
unsigned port_port;
/* non-zero if port is being shared. */
u16 port_subport_cnt;
/* non-zero if port is being shared. */
u16 port_subport_id;
/* chip offset of PIO buffers for this port */
u32 port_piobufs;
/* how many alloc_pages() chunks in port_rcvegrbuf_pages */
@@ -121,6 +125,16 @@ struct ipath_portdata {
u16 port_pkeys[4];
/* so file ops can get at unit */
struct ipath_devdata *port_dd;
/* A page of memory for rcvhdrhead, rcvegrhead, rcvegrtail * N */
void *subport_uregbase;
/* An array of pages for the eager receive buffers * N */
void *subport_rcvegrbuf;
/* An array of pages for the eager header queue entries * N */
void *subport_rcvhdr_base;
/* The version of the library which opened this port */
u32 userversion;
/* Bitmask of active slaves */
u32 active_slaves;
};
struct sk_buff;
@@ -512,6 +526,12 @@ struct ipath_devdata {
u32 ipath_lli_errors;
};
/* Private data for file operations */
struct ipath_filedata {
struct ipath_portdata *pd;
unsigned subport;
unsigned tidcursor;
};
extern struct list_head ipath_dev_list;
extern spinlock_t ipath_devs_lock;
extern struct ipath_devdata *ipath_lookup(int unit);
@@ -572,7 +592,11 @@ int ipath_set_lid(struct ipath_devdata *, u32, u8);
int ipath_set_rx_pol_inv(struct ipath_devdata *dd, u8 new_pol_inv);
/* for use in system calls, where we want to know device type, etc. */
#define port_fp(fp) ((struct ipath_portdata *) (fp)->private_data)
#define port_fp(fp) ((struct ipath_filedata *)(fp)->private_data)->pd
#define subport_fp(fp) \
((struct ipath_filedata *)(fp)->private_data)->subport
#define tidcursor_fp(fp) \
((struct ipath_filedata *)(fp)->private_data)->tidcursor
/*
* values for ipath_flags