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RDMA/hns: Optimize hem allocation performance

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[ Upstream commit fe51f6254d81f5a69c31df16353d6539b2b51630 ]

When allocating MTT hem, for each hop level of each hem that is being
allocated, the driver iterates the hem list to find out whether the
bt page has been allocated in this hop level. If not, allocate a new
one and splice it to the list. The time complexity is O(n^2) in worst
cases.

Currently the allocation for-loop uses 'unit' as the step size. This
actually has taken into account the reuse of last-hop-level MTT bt
pages by multiple buffer pages. Thus pages of last hop level will
never have been allocated, so there is no need to iterate the hem list
in last hop level.

Removing this unnecessary iteration can reduce the time complexity to
O(n).

Fixes: 38389eaa4db1 ("RDMA/hns: Add mtr support for mixed multihop addressing")
Signed-off-by: Junxian Huang <huangjunxian6@hisilicon.com>
Link: https://patch.msgid.link/20240906093444.3571619-9-huangjunxian6@hisilicon.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Junxian Huang 2024-09-06 17:34:43 +08:00 • committed by Ksawlii
parent 979f4d58ca
commit c0f95fbea9
1 changed files with 6 additions and 4 deletions
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10
drivers/infiniband/hw/hns/hns_roce_hem.c
View file

@ -1172,10 +1172,12 @@ static int hem_list_alloc_mid_bt(struct hns_roce_dev *hr_dev,
/* config L1 bt to last bt and link them to corresponding parent */
for (level = 1; level < hopnum; level++) {
cur = hem_list_search_item(&mid_bt[level], offset);
if (cur) {
hem_ptrs[level] = cur;
continue;
if (!hem_list_is_bottom_bt(hopnum, level)) {
cur = hem_list_search_item(&mid_bt[level], offset);
if (cur) {
hem_ptrs[level] = cur;
continue;
}
}
step = hem_list_calc_ba_range(hopnum, level, unit);