This is a note to let you know that I've just added the patch titled IB/SRP: Avoid using IB_MR_TYPE_SG_GAPS to the 4.10-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: ib-srp-avoid-using-ib_mr_type_sg_gaps.patch and it can be found in the queue-4.10 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From d6c58dc40fec35ff6cdb350b53bce0fcf9143709 Mon Sep 17 00:00:00 2001 From: Bart Van Assche <bart.vanassche@xxxxxxxxxxx> Date: Tue, 14 Feb 2017 10:56:29 -0800 Subject: IB/SRP: Avoid using IB_MR_TYPE_SG_GAPS From: Bart Van Assche <bart.vanassche@xxxxxxxxxxx> commit d6c58dc40fec35ff6cdb350b53bce0fcf9143709 upstream. Tests have shown that the following error message is reported when using SG-GAPS registration with an mlx5 adapter: scsi host1: ib_srp: failed RECV status WR flushed (5) for CQE ffff880bd4270eb0 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 0f007806 2500002a ad9fafd1 scsi host1: ib_srp: reconnect succeeded mlx5_0:dump_cqe:262:(pid 7369): dump error cqe 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 0f007806 25000032 00105dd0 scsi host1: ib_srp: failed FAST REG status memory management operation error (6) for CQE ffff880b92860138 Hence avoid using SG-GAPS memory registrations. Additionally, always configure the blk_queue_virt_boundary() to avoid to trigger a mapping failure when using adapters that support SG-GAPS (e.g. mlx5). Fixes: commit ad8e66b4a801 ("IB/srp: fix mr allocation when the device supports sg gaps") Fixes: commit 509c5f33f4f6 ("IB/srp: Prevent mapping failures") Reported-by: Laurence Oberman <loberman@xxxxxxxxxx> Signed-off-by: Bart Van Assche <bart.vanassche@xxxxxxxxxxx> Cc: Israel Rukshin <israelr@xxxxxxxxxxxx> Cc: Max Gurtovoy <maxg@xxxxxxxxxxxx> Cc: Leon Romanovsky <leonro@xxxxxxxxxxxx> Cc: Mark Bloch <markb@xxxxxxxxxxxx> Cc: Yuval Shaia <yuval.shaia@xxxxxxxxxx> Signed-off-by: Doug Ledford <dledford@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/infiniband/ulp/srp/ib_srp.c | 12 +++--------- 1 file changed, 3 insertions(+), 9 deletions(-) --- a/drivers/infiniband/ulp/srp/ib_srp.c +++ b/drivers/infiniband/ulp/srp/ib_srp.c @@ -371,7 +371,6 @@ static struct srp_fr_pool *srp_create_fr struct srp_fr_desc *d; struct ib_mr *mr; int i, ret = -EINVAL; - enum ib_mr_type mr_type; if (pool_size <= 0) goto err; @@ -385,13 +384,9 @@ static struct srp_fr_pool *srp_create_fr spin_lock_init(&pool->lock); INIT_LIST_HEAD(&pool->free_list); - if (device->attrs.device_cap_flags & IB_DEVICE_SG_GAPS_REG) - mr_type = IB_MR_TYPE_SG_GAPS; - else - mr_type = IB_MR_TYPE_MEM_REG; - for (i = 0, d = &pool->desc[0]; i < pool->size; i++, d++) { - mr = ib_alloc_mr(pd, mr_type, max_page_list_len); + mr = ib_alloc_mr(pd, IB_MR_TYPE_MEM_REG, + max_page_list_len); if (IS_ERR(mr)) { ret = PTR_ERR(mr); if (ret == -ENOMEM) @@ -2664,9 +2659,8 @@ static int srp_slave_alloc(struct scsi_d struct Scsi_Host *shost = sdev->host; struct srp_target_port *target = host_to_target(shost); struct srp_device *srp_dev = target->srp_host->srp_dev; - struct ib_device *ibdev = srp_dev->dev; - if (!(ibdev->attrs.device_cap_flags & IB_DEVICE_SG_GAPS_REG)) + if (true) blk_queue_virt_boundary(sdev->request_queue, ~srp_dev->mr_page_mask); Patches currently in stable-queue which might be from bart.vanassche@xxxxxxxxxxx are queue-4.10/ib-srp-avoid-that-duplicate-responses-trigger-a-kernel-bug.patch queue-4.10/ib-srp-fix-race-conditions-related-to-task-management.patch queue-4.10/ib-srp-avoid-using-ib_mr_type_sg_gaps.patch