smb: smbdirect: introduce smbdirect_connection_post_recv_io()

This is basically a copy of smbd_post_recv() in the client and
smb_direct_post_recv() in the server.

The only difference is that this returns early if the connection
is already broken.

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>
Acked-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>

1 files changed, 42 insertions, 0 deletions

diff --git a/fs/smb/common/smbdirect/smbdirect_connection.c b/fs/smb/common/smbdirect/smbdirect_connection.c
index 3b0cbbece44c..81b42eaec8b1 100644
--- a/fs/smb/common/smbdirect/smbdirect_connection.c
+++ b/fs/smb/common/smbdirect/smbdirect_connection.c
@@ -652,6 +652,48 @@ skip_free:
 	wake_up(&sc->send_io.pending.dec_wait_queue);
 }
 
+__maybe_unused /* this is temporary while this file is included in others */
+static int smbdirect_connection_post_recv_io(struct smbdirect_recv_io *msg)
+{
+	struct smbdirect_socket *sc = msg->socket;
+	const struct smbdirect_socket_parameters *sp = &sc->parameters;
+	struct ib_recv_wr recv_wr = {
+		.wr_cqe = &msg->cqe,
+		.sg_list = &msg->sge,
+		.num_sge = 1,
+	};
+	int ret;
+
+	if (unlikely(sc->first_error))
+		return sc->first_error;
+
+	msg->sge.addr = ib_dma_map_single(sc->ib.dev,
+					  msg->packet,
+					  sp->max_recv_size,
+					  DMA_FROM_DEVICE);
+	ret = ib_dma_mapping_error(sc->ib.dev, msg->sge.addr);
+	if (ret)
+		return ret;
+
+	msg->sge.length = sp->max_recv_size;
+	msg->sge.lkey = sc->ib.pd->local_dma_lkey;
+
+	ret = ib_post_recv(sc->ib.qp, &recv_wr, NULL);
+	if (ret) {
+		smbdirect_log_rdma_recv(sc, SMBDIRECT_LOG_ERR,
+			"ib_post_recv failed ret=%d (%1pe)\n",
+			ret, SMBDIRECT_DEBUG_ERR_PTR(ret));
+		ib_dma_unmap_single(sc->ib.dev,
+				    msg->sge.addr,
+				    msg->sge.length,
+				    DMA_FROM_DEVICE);
+		msg->sge.length = 0;
+		smbdirect_socket_schedule_cleanup(sc, ret);
+	}
+
+	return ret;
+}
+
 static bool smbdirect_map_sges_single_page(struct smbdirect_map_sges *state,
 					   struct page *page, size_t off, size_t len)
 {