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authorHåkon Bugge <haakon.bugge@oracle.com>2021-03-31 21:43:13 +0300
committerJason Gunthorpe <jgg@nvidia.com>2021-04-13 01:51:48 +0300
commit3aeffc46afde05140551abb49efaa4563adba38c (patch)
treef1395d533041900e5d79a011ddbb878f0837585f /include/rdma
parent8166e0090511275f0da13a09824bdb43c7972405 (diff)
downloadlinux-3aeffc46afde05140551abb49efaa4563adba38c.tar.xz
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/rdma')
-rw-r--r--include/rdma/rdma_cm.h2
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.