FAILED: Patch "smb: client: let smbd_post_send_negotiate_req() use smbd_post_send()" failed to apply to 5.15-stable tree

FAILED: Patch "smb: client: let smbd_post_send_negotiate_req() use smbd_post_send()" failed to apply to 5.15-stable tree

[Sasha Levin]

The patch below does not apply to the 5.15-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

Thanks,
Sasha

------------------ original commit in Linus's tree ------------------

From 5b1c6149657af840a02885135c700ab42e6aa322 Mon Sep 17 00:00:00 2001
From: Stefan Metzmacher <metze@samba.org>
Date: Thu, 22 Jan 2026 18:16:59 +0100
Subject: [PATCH] smb: client: let smbd_post_send_negotiate_req() use
 smbd_post_send()

The server has similar logic and it makes sure that
request->wr is used instead of a stack struct ib_send_wr send_wr.

This makes sure send_done can see request->wr.send_flags
as the next commit will check for IB_SEND_SIGNALED

Cc: <stable@vger.kernel.org> # 6.18.x
Cc: Steve French <smfrench@gmail.com>
Cc: Tom Talpey <tom@talpey.com>
Cc: Long Li <longli@microsoft.com>
Cc: Namjae Jeon <linkinjeon@kernel.org>
Cc: linux-cifs@vger.kernel.org
Cc: samba-technical@lists.samba.org
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
---
 fs/smb/client/smbdirect.c | 32 +++++++-------------------------
 1 file changed, 7 insertions(+), 25 deletions(-)

diff --git a/fs/smb/client/smbdirect.c b/fs/smb/client/smbdirect.c
index 20faa6d7f514d..88fefb901c27f 100644
--- a/fs/smb/client/smbdirect.c
+++ b/fs/smb/client/smbdirect.c
@@ -35,6 +35,10 @@ static void enqueue_reassembly(
 static struct smbdirect_recv_io *_get_first_reassembly(
 		struct smbdirect_socket *sc);
 
+static int smbd_post_send(struct smbdirect_socket *sc,
+			  struct smbdirect_send_batch *batch,
+			  struct smbdirect_send_io *request);
+
 static int smbd_post_recv(
 		struct smbdirect_socket *sc,
 		struct smbdirect_recv_io *response);
@@ -1021,7 +1025,6 @@ static int smbd_ia_open(
 static int smbd_post_send_negotiate_req(struct smbdirect_socket *sc)
 {
 	struct smbdirect_socket_parameters *sp = &sc->parameters;
-	struct ib_send_wr send_wr;
 	int rc;
 	struct smbdirect_send_io *request;
 	struct smbdirect_negotiate_req *packet;
@@ -1052,33 +1055,12 @@ static int smbd_post_send_negotiate_req(struct smbdirect_socket *sc)
 	request->sge[0].length = sizeof(*packet);
 	request->sge[0].lkey = sc->ib.pd->local_dma_lkey;
 
-	ib_dma_sync_single_for_device(
-		sc->ib.dev, request->sge[0].addr,
-		request->sge[0].length, DMA_TO_DEVICE);
-
-	request->cqe.done = send_done;
-
-	send_wr.next = NULL;
-	send_wr.wr_cqe = &request->cqe;
-	send_wr.sg_list = request->sge;
-	send_wr.num_sge = request->num_sge;
-	send_wr.opcode = IB_WR_SEND;
-	send_wr.send_flags = IB_SEND_SIGNALED;
-
-	log_rdma_send(INFO, "sge addr=0x%llx length=%u lkey=0x%x\n",
-		request->sge[0].addr,
-		request->sge[0].length, request->sge[0].lkey);
-
-	atomic_inc(&sc->send_io.pending.count);
-	rc = ib_post_send(sc->ib.qp, &send_wr, NULL);
+	rc = smbd_post_send(sc, NULL, request);
 	if (!rc)
 		return 0;
 
-	/* if we reach here, post send failed */
-	log_rdma_send(ERR, "ib_post_send failed rc=%d\n", rc);
-	atomic_dec(&sc->send_io.pending.count);
-
-	smbd_disconnect_rdma_connection(sc);
+	if (rc == -EAGAIN)
+		rc = -EIO;
 
 dma_mapping_failed:
 	smbd_free_send_io(request);
-- 
2.51.0