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| author |   David Dillow <dillowda@ornl.gov> | 2011-01-16 13:57:10 -0500 |
|---|---|---|
| committer | David Dillow <dillowda@ornl.gov> | 2011-03-15 19:37:23 -0400 |
| commit | c07d424d6118d528ef71b22b7424bfc359c307a5 (patch) | |
| tree | 1d61da8aea0fa80c2c7bc13b03d15ddb470bcfa6 /drivers/infiniband/ulp/srp/ib_srp.h | |
| parent | IB/srp: rework mapping engine to use multiple FMR entries (diff) | |
| download | linux-dev-c07d424d6118d528ef71b22b7424bfc359c307a5.tar.xz linux-dev-c07d424d6118d528ef71b22b7424bfc359c307a5.zip | |
IB/srp: add support for indirect tables that don't fit in SRP_CMD
This allows us to guarantee the ability to submit up to 8 MB requests
based on the current value of SCSI_MAX_SG_CHAIN_SEGMENTS. While FMR will
usually condense the requests into 8 SG entries, it is imperative that
the target support external tables in case the FMR mapping fails or is
not supported.
We add a safety valve to allow targets without the needed support to
reap the benefits of the large tables, but fail in a manner that lets
the user know that the data didn't make it to the device. The user must
add "allow_ext_sg=1" to the target parameters to indicate that the
target has the needed support.
If indirect_sg_entries is not specified in the modules options, then
the sg_tablesize for the target will default to cmd_sg_entries unless
overridden by the target options.
Signed-off-by: David Dillow <dillowda@ornl.gov>
Diffstat (limited to 'drivers/infiniband/ulp/srp/ib_srp.h')
| -rw-r--r-- | drivers/infiniband/ulp/srp/ib_srp.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/infiniband/ulp/srp/ib_srp.h b/drivers/infiniband/ulp/srp/ib_srp.h index b43b5e7acbde..cf696218eeeb 100644 --- a/drivers/infiniband/ulp/srp/ib_srp.h +++ b/drivers/infiniband/ulp/srp/ib_srp.h @@ -117,6 +117,8 @@ struct srp_request { struct srp_iu *cmd; struct ib_pool_fmr **fmr_list; u64 *map_page; + struct srp_direct_buf *indirect_desc; + dma_addr_t indirect_dma_addr; short nfmr; short index; }; @@ -137,6 +139,8 @@ struct srp_target_port { enum srp_target_state state; unsigned int max_iu_len; unsigned int cmd_sg_cnt; + unsigned int indirect_size; + bool allow_ext_sg; /* Everything above this point is used in the hot path of * command processing. Try to keep them packed into cachelines. @@ -151,6 +155,7 @@ struct srp_target_port { struct Scsi_Host *scsi_host; char target_name[32]; unsigned int scsi_id; + unsigned int sg_tablesize; struct ib_sa_path_rec path; __be16 orig_dgid[8]; |