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| author | Håkon Bugge <haakon.bugge@oracle.com> | 2021-03-31 20:43:13 +0200 |
|---|---|---|
| committer | Jason Gunthorpe <jgg@nvidia.com> | 2021-04-13 00:51:48 +0200 |
| commit | 3aeffc46afde05140551abb49efaa4563adba38c (patch) | |
| tree | f1395d533041900e5d79a011ddbb878f0837585f /include | |
| parent | RDMA/i40iw: Use DEFINE_SPINLOCK() for spinlock (diff) | |
| download | linux-3aeffc46afde05140551abb49efaa4563adba38c.tar.xz linux-3aeffc46afde05140551abb49efaa4563adba38c.zip | |
IB/cma: Introduce rdma_set_min_rnr_timer()
Introduce the ability for kernel ULPs to adjust the minimum RNR Retry
timer. The INIT -> RTR transition executed by RDMA CM will be used for
this adjustment. This avoids an additional ib_modify_qp() call.
rdma_set_min_rnr_timer() must be called before the call to rdma_connect()
on the active side and before the call to rdma_accept() on the passive
side.
The default value of RNR Retry timer is zero, which translates to 655
ms. When the receiver is not ready to accept a send messages, it encodes
the RNR Retry timer value in the NAK. The requestor will then wait at
least the specified time value before retrying the send.
The 5-bit value to be supplied to the rdma_set_min_rnr_timer() is
documented in IBTA Table 45: "Encoding for RNR NAK Timer Field".
Link: https://lore.kernel.org/r/1617216194-12890-2-git-send-email-haakon.bugge@oracle.com
Signed-off-by: Håkon Bugge <haakon.bugge@oracle.com>
Acked-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/rdma/rdma_cm.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/rdma/rdma_cm.h b/include/rdma/rdma_cm.h index b2eed6d30543..d989f030fae0 100644 --- a/include/rdma/rdma_cm.h +++ b/include/rdma/rdma_cm.h @@ -331,6 +331,8 @@ int rdma_set_reuseaddr(struct rdma_cm_id *id, int reuse); int rdma_set_afonly(struct rdma_cm_id *id, int afonly); int rdma_set_ack_timeout(struct rdma_cm_id *id, u8 timeout); + +int rdma_set_min_rnr_timer(struct rdma_cm_id *id, u8 min_rnr_timer); /** * rdma_get_service_id - Return the IB service ID for a specified address. * @id: Communication identifier associated with the address. |