Patch "ksmbd: smbd: create MR pool" has been added to the 5.15-stable tree

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This is a note to let you know that I've just added the patch titled

    ksmbd: smbd: create MR pool

to the 5.15-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:
     ksmbd-smbd-create-mr-pool.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From stable+bounces-7648-greg=kroah.com@xxxxxxxxxxxxxxx Mon Dec 18 16:39:20 2023
From: Namjae Jeon <linkinjeon@xxxxxxxxxx>
Date: Tue, 19 Dec 2023 00:32:39 +0900
Subject: ksmbd: smbd: create MR pool
To: gregkh@xxxxxxxxxxxxxxxxxxx, stable@xxxxxxxxxxxxxxx
Cc: smfrench@xxxxxxxxx, Hyunchul Lee <hyc.lee@xxxxxxxxx>, Namjae Jeon <linkinjeon@xxxxxxxxxx>, Steve French <stfrench@xxxxxxxxxxxxx>
Message-ID: <20231218153454.8090-20-linkinjeon@xxxxxxxxxx>

From: Hyunchul Lee <hyc.lee@xxxxxxxxx>

[ Upstream commit c9f189271cff85d5d735e25dfa4bc95952ec12d8 ]

Create a memory region pool because rdma_rw_ctx_init()
uses memory registration if memory registration yields
better performance than using multiple SGE entries.

Acked-by: Namjae Jeon <linkinjeon@xxxxxxxxxx>
Signed-off-by: Hyunchul Lee <hyc.lee@xxxxxxxxx>
Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 fs/ksmbd/transport_rdma.c |   23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

--- a/fs/ksmbd/transport_rdma.c
+++ b/fs/ksmbd/transport_rdma.c
@@ -434,6 +434,7 @@ static void free_transport(struct smb_di
 
 	if (t->qp) {
 		ib_drain_qp(t->qp);
+		ib_mr_pool_destroy(t->qp, &t->qp->rdma_mrs);
 		ib_destroy_qp(t->qp);
 	}
 
@@ -1714,7 +1715,9 @@ static int smb_direct_init_params(struct
 	cap->max_send_sge = SMB_DIRECT_MAX_SEND_SGES;
 	cap->max_recv_sge = SMB_DIRECT_MAX_RECV_SGES;
 	cap->max_inline_data = 0;
-	cap->max_rdma_ctxs = 0;
+	cap->max_rdma_ctxs =
+		rdma_rw_mr_factor(device, t->cm_id->port_num, max_pages) *
+		smb_direct_max_outstanding_rw_ops;
 	return 0;
 }
 
@@ -1796,6 +1799,7 @@ static int smb_direct_create_qpair(struc
 {
 	int ret;
 	struct ib_qp_init_attr qp_attr;
+	int pages_per_rw;
 
 	t->pd = ib_alloc_pd(t->cm_id->device, 0);
 	if (IS_ERR(t->pd)) {
@@ -1843,6 +1847,23 @@ static int smb_direct_create_qpair(struc
 	t->qp = t->cm_id->qp;
 	t->cm_id->event_handler = smb_direct_cm_handler;
 
+	pages_per_rw = DIV_ROUND_UP(t->max_rdma_rw_size, PAGE_SIZE) + 1;
+	if (pages_per_rw > t->cm_id->device->attrs.max_sgl_rd) {
+		int pages_per_mr, mr_count;
+
+		pages_per_mr = min_t(int, pages_per_rw,
+				     t->cm_id->device->attrs.max_fast_reg_page_list_len);
+		mr_count = DIV_ROUND_UP(pages_per_rw, pages_per_mr) *
+			atomic_read(&t->rw_avail_ops);
+		ret = ib_mr_pool_init(t->qp, &t->qp->rdma_mrs, mr_count,
+				      IB_MR_TYPE_MEM_REG, pages_per_mr, 0);
+		if (ret) {
+			pr_err("failed to init mr pool count %d pages %d\n",
+			       mr_count, pages_per_mr);
+			goto err;
+		}
+	}
+
 	return 0;
 err:
 	if (t->qp) {


Patches currently in stable-queue which might be from kroah.com@xxxxxxxxxxxxxxx are

queue-5.15/ksmbd-remove-unused-parameter-from-smb2_get_name.patch
queue-5.15/ksmbd-smbd-handle-multiple-buffer-descriptors.patch
queue-5.15/ksmbd-add-mnt_want_write-to-ksmbd-vfs-functions.patch
queue-5.15/ksmbd-delete-an-invalid-argument-description-in-smb2_populate_readdir_entry.patch
queue-5.15/ksmbd-remove-smb2_buf_length-in-smb2_transform_hdr.patch
queue-5.15/ksmbd-fix-smb2_set_info_file-kernel-doc-comment.patch
queue-5.15/ksmbd-remove-unused-fields-from-ksmbd_file-struct-definition.patch
queue-5.15/ksmbd-set-445-port-to-smbdirect-port-by-default.patch
queue-5.15/ksmbd-use-ksmbd_req_buf_next-in-ksmbd_verify_smb_message.patch
queue-5.15/ksmbd-set-both-ipv4-and-ipv6-in-fsctl_query_network_interface_info.patch
queue-5.15/ksmbd-reduce-descriptor-size-if-remaining-bytes-is-less-than-request-size.patch
queue-5.15/ksmbd-fix-smb2_get_name-kernel-doc-comment.patch
queue-5.15/ksmbd-register-ksmbd-ib-client-with-ib_register_client.patch
queue-5.15/ksmbd-smbd-fix-missing-client-s-memory-region-invalidation.patch
queue-5.15/ksmbd-fix-parameter-name-and-comment-mismatch.patch
queue-5.15/ksmbd-smbd-call-rdma_accept-under-cm-handler.patch
queue-5.15/ksmdb-use-cmd-helper-variable-in-smb2_get_ksmbd_tcon.patch
queue-5.15/ksmbd-smbd-change-the-default-maximum-read-write-receive-size.patch
queue-5.15/ksmbd-smbd-remove-useless-license-text-when-spdx-license-identifier-is-already-used.patch
queue-5.15/ksmbd-check-the-validation-of-pdu_size-in-ksmbd_conn_handler_loop.patch
queue-5.15/ksmbd-fix-buffer_check_err-kernel-doc-comment.patch
queue-5.15/ksmbd-remove-redundant-flush_workqueue-calls.patch
queue-5.15/ksmbd-smbd-create-mr-pool.patch
queue-5.15/ksmbd-remove-smb2_buf_length-in-smb2_hdr.patch
queue-5.15/ksmbd-remove-md4-leftovers.patch
queue-5.15/ksmbd-add-smb-direct-shutdown.patch




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