This is a note to let you know that I've just added the patch titled
RDMA/hns: Add mapped page count checking for MTR
to the 5.10-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:
rdma-hns-add-mapped-page-count-checking-for-mtr.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 109a40fe0659dd420921090734ac12259689b03e
Author: Xi Wang <wangxi11@xxxxxxxxxx>
Date: Fri Feb 5 17:39:25 2021 +0800
RDMA/hns: Add mapped page count checking for MTR
[ Upstream commit 9ea9a53ea93be1cc66729ceb920f0d07285d6bfd ]
Add the mapped page count checking flow to avoid invalid page size when
creating MTR.
Fixes: 38389eaa4db1 ("RDMA/hns: Add mtr support for mixed multihop addressing")
Link: https://lore.kernel.org/r/1612517974-31867-4-git-send-email-liweihang@xxxxxxxxxx
Signed-off-by: Xi Wang <wangxi11@xxxxxxxxxx>
Signed-off-by: Weihang Li <liweihang@xxxxxxxxxx>
Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxx>
Stable-dep-of: d586628b169d ("RDMA/hns: Fix the overflow risk of hem_list_calc_ba_range()")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/infiniband/hw/hns/hns_roce_hem.c b/drivers/infiniband/hw/hns/hns_roce_hem.c
index 854b41c14774d..fa920a7621eef 100644
--- a/drivers/infiniband/hw/hns/hns_roce_hem.c
+++ b/drivers/infiniband/hw/hns/hns_roce_hem.c
@@ -981,9 +981,8 @@ static struct roce_hem_item *hem_list_alloc_item(struct hns_roce_dev *hr_dev,
return NULL;
if (exist_bt) {
- hem->addr = dma_alloc_coherent(hr_dev->dev,
- count * BA_BYTE_LEN,
- &hem->dma_addr, GFP_KERNEL);
+ hem->addr = dma_alloc_coherent(hr_dev->dev, count * BA_BYTE_LEN,
+ &hem->dma_addr, GFP_KERNEL);
if (!hem->addr) {
kfree(hem);
return NULL;
@@ -1242,6 +1241,10 @@ static int hem_list_alloc_root_bt(struct hns_roce_dev *hr_dev,
if (ba_num < 1)
return -ENOMEM;
+ if (ba_num > unit)
+ return -ENOBUFS;
+
+ ba_num = min_t(int, ba_num, unit);
INIT_LIST_HEAD(&temp_root);
offset = r->offset;
/* indicate to last region */
diff --git a/drivers/infiniband/hw/hns/hns_roce_mr.c b/drivers/infiniband/hw/hns/hns_roce_mr.c
index 7e93c9b4a33f1..5fad718cfdbe3 100644
--- a/drivers/infiniband/hw/hns/hns_roce_mr.c
+++ b/drivers/infiniband/hw/hns/hns_roce_mr.c
@@ -633,30 +633,26 @@ int hns_roce_dealloc_mw(struct ib_mw *ibmw)
}
static int mtr_map_region(struct hns_roce_dev *hr_dev, struct hns_roce_mtr *mtr,
- dma_addr_t *pages, struct hns_roce_buf_region *region)
+ struct hns_roce_buf_region *region, dma_addr_t *pages,
+ int max_count)
{
+ int count, npage;
+ int offset, end;
__le64 *mtts;
- int offset;
- int count;
- int npage;
u64 addr;
- int end;
int i;
- /* if hopnum is 0, buffer cannot store BAs, so skip write mtt */
- if (!region->hopnum)
- return 0;
-
offset = region->offset;
end = offset + region->count;
npage = 0;
- while (offset < end) {
+ while (offset < end && npage < max_count) {
+ count = 0;
mtts = hns_roce_hem_list_find_mtt(hr_dev, &mtr->hem_list,
offset, &count, NULL);
if (!mtts)
return -ENOBUFS;
- for (i = 0; i < count; i++) {
+ for (i = 0; i < count && npage < max_count; i++) {
if (hr_dev->hw_rev == HNS_ROCE_HW_VER1)
addr = to_hr_hw_page_addr(pages[npage]);
else
@@ -668,7 +664,7 @@ static int mtr_map_region(struct hns_roce_dev *hr_dev, struct hns_roce_mtr *mtr,
offset += count;
}
- return 0;
+ return npage;
}
static inline bool mtr_has_mtt(struct hns_roce_buf_attr *attr)
@@ -835,8 +831,8 @@ int hns_roce_mtr_map(struct hns_roce_dev *hr_dev, struct hns_roce_mtr *mtr,
{
struct ib_device *ibdev = &hr_dev->ib_dev;
struct hns_roce_buf_region *r;
- unsigned int i;
- int err;
+ unsigned int i, mapped_cnt;
+ int ret;
/*
* Only use the first page address as root ba when hopnum is 0, this
@@ -847,26 +843,42 @@ int hns_roce_mtr_map(struct hns_roce_dev *hr_dev, struct hns_roce_mtr *mtr,
return 0;
}
- for (i = 0; i < mtr->hem_cfg.region_count; i++) {
+ for (i = 0, mapped_cnt = 0; i < mtr->hem_cfg.region_count &&
+ mapped_cnt < page_cnt; i++) {
r = &mtr->hem_cfg.region[i];
+ /* if hopnum is 0, no need to map pages in this region */
+ if (!r->hopnum) {
+ mapped_cnt += r->count;
+ continue;
+ }
+
if (r->offset + r->count > page_cnt) {
- err = -EINVAL;
+ ret = -EINVAL;
ibdev_err(ibdev,
"failed to check mtr%u end %u + %u, max %u.\n",
i, r->offset, r->count, page_cnt);
- return err;
+ return ret;
}
- err = mtr_map_region(hr_dev, mtr, &pages[r->offset], r);
- if (err) {
+ ret = mtr_map_region(hr_dev, mtr, r, &pages[r->offset],
+ page_cnt - mapped_cnt);
+ if (ret < 0) {
ibdev_err(ibdev,
"failed to map mtr%u offset %u, ret = %d.\n",
- i, r->offset, err);
- return err;
+ i, r->offset, ret);
+ return ret;
}
+ mapped_cnt += ret;
+ ret = 0;
}
- return 0;
+ if (mapped_cnt < page_cnt) {
+ ret = -ENOBUFS;
+ ibdev_err(ibdev, "failed to map mtr pages count: %u < %u.\n",
+ mapped_cnt, page_cnt);
+ }
+
+ return ret;
}
int hns_roce_mtr_find(struct hns_roce_dev *hr_dev, struct hns_roce_mtr *mtr,
