On Wed, Oct 30, 2019 at 01:44:00PM +0100, Dag Moxnes wrote: > The cma is currently using a hard-coded value, CMA_IBOE_PACKET_LIFETIME, > for the PacketLifeTime, as it can not be determined from the network. > This value might not be optimal for all networks. > > The cma module supports the function rdma_set_ack_timeout to set the > ACK timeout for a QP associated with a connection. As per IBTA 12.7.34 > local ACK timeout = (2 * PacketLifeTime + Local CA’s ACK delay). > Assuming a negligible local ACK delay, we can use > PacketLifeTime = local ACK timeout/2 > as a reasonable approximation for RoCE networks. > > Signed-off-by: Dag Moxnes <dag.moxnes@xxxxxxxxxx> > --- > drivers/infiniband/core/cma.c | 15 +++++++++++++-- > 1 file changed, 13 insertions(+), 2 deletions(-) This seems like a reasonable thing to do, applied to for-next Thanks, Jason
