diff options
author | Bart Van Assche <bvanassche@acm.org> | 2014-10-06 15:14:36 (GMT) |
---|---|---|
committer | Christoph Hellwig <hch@lst.de> | 2014-11-12 11:05:24 (GMT) |
commit | d92c0da71a35dfddccca7bfa932829504311359e (patch) | |
tree | 84b87ede947430e8b53b33bf99c349c99243cb9d /drivers/infiniband/ulp/srp/ib_srp.h | |
parent | 77f2c1a40e6fed202d08c8ec0bdca36a76dab368 (diff) | |
download | linux-d92c0da71a35dfddccca7bfa932829504311359e.tar.xz |
IB/srp: Add multichannel support
Improve performance by using multiple RDMA/RC channels per SCSI
host for communication with an SRP target. About the
implementation:
- Introduce a loop over all channels in the code that uses
target->ch.
- Set the SRP_MULTICHAN_MULTI flag during login for the creation
of the second and subsequent channels.
- RDMA completion vectors are chosen such that RDMA completion
interrupts are handled by the CPU socket that submitted the I/O
request. As one can see in this patch it has been assumed if a
system contains n CPU sockets and m RDMA completion vectors
have been assigned to an RDMA HCA that IRQ affinity has been
configured such that completion vectors [i*m/n..(i+1)*m/n) are
bound to CPU socket i with 0 <= i < n.
- Modify srp_free_ch_ib() and srp_free_req_data() such that it
becomes safe to invoke these functions after the corresponding
allocation function failed.
- Add a ch_count sysfs attribute per target port.
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'drivers/infiniband/ulp/srp/ib_srp.h')
-rw-r--r-- | drivers/infiniband/ulp/srp/ib_srp.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/infiniband/ulp/srp/ib_srp.h b/drivers/infiniband/ulp/srp/ib_srp.h index 37aa9f4..ca7c6f0 100644 --- a/drivers/infiniband/ulp/srp/ib_srp.h +++ b/drivers/infiniband/ulp/srp/ib_srp.h @@ -179,8 +179,9 @@ struct srp_target_port { /* read and written in the hot path */ spinlock_t lock; - struct srp_rdma_ch ch; /* read only in the hot path */ + struct srp_rdma_ch *ch; + u32 ch_count; u32 lkey; u32 rkey; enum srp_target_state state; |