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authorVlad Buslov <vladbu@mellanox.com>2019-04-24 09:53:31 +0300
committerDavid S. Miller <davem@davemloft.net>2019-04-24 11:53:28 -0700
commitc049d56eb219661c9ae48d596c3e633973f89d1f (patch)
treeed3b8089da89fa4eff606e6ec40c42193d44e43d /net/rxrpc/local_object.c
parenta3ddd94f3efb3a9eda8ce7183f821a9c4fa3b47f (diff)
downloadlinux-stericsson-c049d56eb219661c9ae48d596c3e633973f89d1f.tar.gz
net: sched: flower: refactor reoffload for concurrent access
Recent changes that introduced unlocked flower did not properly account for case when reoffload is initiated concurrently with filter updates. To fix the issue, extend flower with 'hw_filters' list that is used to store filters that don't have 'skip_hw' flag set. Filter is added to the list when it is inserted to hardware and only removed from it after being unoffloaded from all drivers that parent block is attached to. This ensures that concurrent reoffload can still access filter that is being deleted and prevents race condition when driver callback can be removed when filter is no longer accessible trough idr, but is still present in hardware. Refactor fl_change() to respect new filter reference counter and to release filter reference with __fl_put() in case of error, instead of directly deallocating filter memory. This allows for concurrent access to filter from fl_reoffload() and protects it with reference counting. Refactor fl_reoffload() to iterate over hw_filters list instead of idr. Implement fl_get_next_hw_filter() helper function that is used to iterate over hw_filters list with reference counting and skips filters that are being concurrently deleted. Fixes: 92149190067d ("net: sched: flower: set unlocked flag for flower proto ops") Signed-off-by: Vlad Buslov <vladbu@mellanox.com> Reviewed-by: Saeed Mahameed <saeedm@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/rxrpc/local_object.c')
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