linux-kernel - [PATCH RFC V2 1/6] RDMA/rxe: RDMA/rxe: don't allow registering !PAGE

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Date:   Fri,  3 Nov 2023 17:55:44 +0800
From:   Li Zhijian <lizhijian@...itsu.com>
To:     zyjzyj2000@...il.com, jgg@...pe.ca, leon@...nel.org,
        linux-rdma@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, rpearsonhpe@...il.com,
        matsuda-daisuke@...itsu.com, bvanassche@....org,
        yi.zhang@...hat.com, Li Zhijian <lizhijian@...itsu.com>
Subject: [PATCH RFC V2 1/6] RDMA/rxe: RDMA/rxe: don't allow registering !PAGE_SIZE mr

rxe_set_page() only store one PAGE_SIZE page by the step of page_size.
when page_size != PAGE_SIZE, we cannot restore the address with wrong
index and page_offset.

Let's take a look how current the xarray is being used.

0. offset = iova & (page_size -1); // offset is less than page_size
                                      but may not PAGE_SIZE
1. index = (iova - mr.iova) >> page_shift;
2. page = xa_load(&mr->page_list, index);
3. page_va = kmap_local_page(page) // map one page only, that means only
                                      memory [page_va, page_va + PAGE_SIZE)
                                      is valid for this mapping.
4. memcpy(addr, page_va + offset, bytes);

- when page_size > PAGE_SIZE, the offset could be beyond PAGE_SIZE,
  then page_va + offset may be invalid.
- when page_size < PAGE_SIZE, the offset may get lost.

Note that this patch will break some ULPs that try to register 4K
MR when PAGE_SIZE is not 4K. SRP and nvme over RXE is known to be
impacted.

Signed-off-by: Li Zhijian <lizhijian@...itsu.com>

---
---
 drivers/infiniband/sw/rxe/rxe_mr.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/infiniband/sw/rxe/rxe_mr.c b/drivers/infiniband/sw/rxe/rxe_mr.c
index f54042e9aeb2..3755e530e6dc 100644
--- a/drivers/infiniband/sw/rxe/rxe_mr.c
+++ b/drivers/infiniband/sw/rxe/rxe_mr.c
@@ -234,6 +234,12 @@ int rxe_map_mr_sg(struct ib_mr *ibmr, struct scatterlist *sgl,
 	struct rxe_mr *mr = to_rmr(ibmr);
 	unsigned int page_size = mr_page_size(mr);
 
+	if (page_size != PAGE_SIZE) {
+		rxe_err_mr(mr, "Unsupport mr page size %x, expect PAGE_SIZE(%lx)\n",
+			   page_size, PAGE_SIZE);
+		return -EINVAL;
+	}
+
 	mr->nbuf = 0;
 	mr->page_shift = ilog2(page_size);
 	mr->page_mask = ~((u64)page_size - 1);
-- 
2.41.0