IB/ipath: Driver support for userspace sharing of HW contexts
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>
diff --git a/drivers/infiniband/hw/ipath/ipath_kernel.h b/drivers/infiniband/hw/ipath/ipath_kernel.h
index a8a5627..0cabd4f 100644
--- a/drivers/infiniband/hw/ipath/ipath_kernel.h
+++ b/drivers/infiniband/hw/ipath/ipath_kernel.h
@@ -79,8 +79,8 @@
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 @@
*/
/* 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 @@
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 @@
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_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