IB/srp: rework mapping engine to use multiple FMR entries

Browse source

Instead of forcing all of the S/G entries to fit in one FMR, and falling
back to indirect descriptors if that fails, allow the use of as many
FMRs as needed to map the request. This lays the groundwork for allowing
indirect descriptor tables that are larger than can fit in the command
IU, but should marginally improve performance now by reducing the number
of indirect descriptors needed.

We increase the minimum page size for the FMR pool to 4K, as larger
pages help increase the coverage of each FMR, and it is rare that the
kernel would send down a request with scattered 512 byte fragments.

This patch also move some of the target initialization code afte the
parsing of options, to keep it together with the new code that needs to
allocate memory based on the options given.

Signed-off-by: David Dillow <dillowda@ornl.gov>

...

This commit is contained in:

David Dillow 2011-01-14 19:45:50 -05:00

parent 4924864404

commit 8f26c9ff9c

2 changed files with 266 additions and 129 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

383

drivers/infiniband/ulp/srp/ib_srp.c

View file

28

drivers/infiniband/ulp/srp/ib_srp.h

View file