There are several race conditions discovered in the current rdma_rxe driver. They mostly relate to races between normal operations and destroying objects. This patch series includes the remaining two patches of the original series. Signed-off-by: Bob Pearson <rpearsonhpe@xxxxxxxxx> --- v15 Rebased to the current for-next branch of 5.19.0-rc1+. Adds support for RDMA_AH_CREATE/DESTROY_SLEEPABLE. v14 Rebased to current wip/jgg-for-next Removed patch 3 as unnecessary Waited for resolution of bugs in rxe_resp and some locking bugs. Note: With rcu read lock in rxe_pool_get_index there are no bottom half spinlocks from looking up AH or non AH objects to conflict with the default xa_lock so no lockdep warnings occur. The rxe_pool alloc functions can hold locks simultanteously with the rcu read lock so it does not have to prevent soft or hard IRQs. v13 Rebased to current for-next Addressed Jason's comments on patch 1, 8 and 9. 8 and 9 are combined into one patch. v12 Rebased to current wip/jgg-for-next Dropped patches already accepted from v11. Moved all object cleanup code to type specific cleanup routines. Renamed to match Jason's requests. Addressed some other issued raised. Kept the contentious rxe_hide() function but renamed to rxe_disable_lookup() which says what it does. I am still convinced this cleaner than other alternatives like moving xa_erase to the top of destroy routines but just for indexed objects. v11 Rebased to current for-next. Reordered patches and made other changes to respond to issues reported by Jason Gunthorpe. v10 Rebased to current wip/jgg-for-next. Split some patches into smaller ones. v9 Corrected issues reported by Jason Gunthorpe, Converted locking in rxe_mcast.c and rxe_pool.c to use RCU Split up the patches into smaller changes v8 Fixed an additional race in 3/8 which was not handled correctly. v7 Corrected issues reported by Jason Gunthorpe Link: https://lore.kernel.org/linux-rdma/20211207190947.GH6385@xxxxxxxxxx/ Link: https://lore.kernel.org/linux-rdma/20211207191857.GI6385@xxxxxxxxxx/ Link: https://lore.kernel.org/linux-rdma/20211207192824.GJ6385@xxxxxxxxxx/ v6 Fixed a kzalloc flags bug. Fixed comment bug reported by 'Kernel Test Robot'. Changed type of rxe_pool.c in __rxe_fini(). v5 Removed patches already accepted into for-next and addressed comments from Jason Gunthorpe. v4 Restructured patch series to change to xarray earlier which greatly simplified the changes. Rebased to current for-next v3 Changed rxe_alloc to use GFP_KERNEL Addressed other comments by Jason Gunthorp Merged the previous 06/10 and 07/10 patches into one since they overlapped Added some minor cleanups as 10/10 v2 Rebased to current for-next. Added 4 additional patches Bob Pearson (2): RDMA/rxe: Stop lookup of partially built objects RDMA/rxe: Convert read side locking to rcu drivers/infiniband/sw/rxe/rxe_mr.c | 2 +- drivers/infiniband/sw/rxe/rxe_mw.c | 4 +- drivers/infiniband/sw/rxe/rxe_pool.c | 97 ++++++++++++++++++++++++--- drivers/infiniband/sw/rxe/rxe_pool.h | 18 +++-- drivers/infiniband/sw/rxe/rxe_req.c | 37 ++++++++-- drivers/infiniband/sw/rxe/rxe_verbs.c | 39 +++++++---- 6 files changed, 160 insertions(+), 37 deletions(-) base-commit: f2906aa863381afb0015a9eb7fefad885d4e5a56 -- 2.34.1
