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authorDaniel Jurgens <danielj@mellanox.com>2015-11-19 17:12:26 +0200
committerSaeed Mahameed <saeedm@mellanox.com>2017-02-06 18:17:25 +0200
commitf32f5bd2eb7e91a5090c06bbe1ed14bffbbda5d3 (patch)
tree297e2374d3fff18fb0296597fa58399af3278953 /include/net/ipx.h
parenta61d5ce9cc56e2e41bbb1ad62ca7a16d7e7567bd (diff)
net/mlx5: Configure cache line size for start and end padding
There is a hardware feature that will pad the start or end of a DMA to be cache line aligned to avoid RMWs on the last cache line. The default cache line size setting for this feature is 64B. This change configures the hardware to use 128B alignment on systems with 128B cache lines. In addition we lower bound MPWRQ stride by HCA cacheline in mlx5e, MPWRQ stride should be at least the HCA cacheline, the current default is 64B and in case HCA_CAP.cach_line_128byte capability is set, MPWRQ RX stride will automatically be aligned to 128B. Signed-off-by: Daniel Jurgens <danielj@mellanox.com> Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Diffstat (limited to 'include/net/ipx.h')
0 files changed, 0 insertions, 0 deletions
blk_mq_queue_reinit_prepare+0x84/0xa0 cpuhp_invoke_callback+0x17c/0x600 cpuhp_up_callbacks+0x58/0x150 _cpu_up+0xf0/0x1c0 do_cpu_up+0x120/0x150 cpu_subsys_online+0x64/0xe0 device_online+0xb4/0x120 online_store+0xb4/0xc0 dev_attr_store+0x68/0xa0 sysfs_kf_write+0x80/0xb0 kernfs_fop_write+0x17c/0x250 __vfs_write+0x6c/0x1e0 vfs_write+0xd0/0x270 SyS_write+0x6c/0x110 system_call+0x38/0xe0 Examination of the queue showed a single reference (no PERCPU_COUNT_BIAS, and __PERCPU_REF_DEAD, __PERCPU_REF_ATOMIC set) and no requests. However, conditions at the time of the race are count of PERCPU_COUNT_BIAS + 0 and __PERCPU_REF_DEAD and __PERCPU_REF_ATOMIC set. The fix is to make the tryget routines use an actual boolean internally instead of the atomic long result truncated to a int. Fixes: e625305b3907 percpu-refcount: make percpu_ref based on longs instead of ints Link: https://bugzilla.kernel.org/show_bug.cgi?id=190751 Signed-off-by: Douglas Miller <dougmill@linux.vnet.ibm.com> Reviewed-by: Jens Axboe <axboe@fb.com> Signed-off-by: Tejun Heo <tj@kernel.org> Fixes: e625305b3907 ("percpu-refcount: make percpu_ref based on longs instead of ints") Cc: stable@vger.kernel.org # v3.18+
Diffstat (limited to 'net/rds/info.h')