RDS: make sure we post recv buffers

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If we get an ENOMEM during rds_ib_recv_refill, we might never come
back and refill again later. Patch makes sure to kick krdsd into
helping out.

To achieve this we add RDS_RECV_REFILL flag and update in the refill
path based on that so that at least some therad will keep posting
receive buffers.

Since krdsd and softirq both might race for refill, we decide to
schedule on work queue based on ring_low instead of ring_empty.

Reviewed-by: Ajaykumar Hotchandani <ajaykumar.hotchandani@oracle.com>
Signed-off-by: Santosh Shilimkar <ssantosh@kernel.org>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

...

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santosh.shilimkar@oracle.com 2015-08-22 15:45:26 -07:00 • committed by David S. Miller

parent e1f475a738

commit 73ce4317bf

5 changed files with 57 additions and 8 deletions

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2

net/rds/connection.c

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2

net/rds/ib.h

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2

net/rds/ib_cm.c

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58

net/rds/ib_recv.c

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1

net/rds/rds.h

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