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2023-12-08 01573e231f18eb2d99162747186f59511f56b64d

 kernel/drivers/scsi/libiscsi_tcp.c
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@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0-or-later
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 /*
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  * iSCSI over TCP/IP Data-Path lib
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  *
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@@ -6,18 +7,6 @@
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  * Copyright (C) 2005 - 2006 Mike Christie
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  * Copyright (C) 2006 Red Hat, Inc.  All rights reserved.
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  * maintained by open-iscsi@googlegroups.com
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License as published
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- * by the Free Software Foundation; either version 2 of the License, or
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- * (at your option) any later version.
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- *
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- * This program is distributed in the hope that it will be useful, but
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- * WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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- * General Public License for more details.
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- *
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- * See the file COPYING included with this distribution for more details.
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  *
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  * Credits:
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  *	Christoph Hellwig
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@@ -43,6 +32,7 @@
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 #include <scsi/scsi_host.h>
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 #include <scsi/scsi.h>
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 #include <scsi/scsi_transport_iscsi.h>
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+#include <trace/events/iscsi.h>
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 #include "iscsi_tcp.h"
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@@ -65,6 +55,9 @@
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 			iscsi_conn_printk(KERN_INFO, _conn,	\
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 					     "%s " dbg_fmt,	\
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 					     __func__, ##arg);	\
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+		iscsi_dbg_trace(trace_iscsi_dbg_tcp,		\
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+				&(_conn)->cls_conn->dev,	\
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+				"%s " dbg_fmt, __func__, ##arg);\
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 	} while (0);
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 static int iscsi_tcp_hdr_recv_done(struct iscsi_tcp_conn *tcp_conn,
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@@ -125,12 +118,17 @@
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 	BUG_ON(sg->length == 0);
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 	/*
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+	 * We always map for the recv path.
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+	 *
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 	 * If the page count is greater than one it is ok to send
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 	 * to the network layer's zero copy send path. If not we
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-	 * have to go the slow sendmsg path. We always map for the
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-	 * recv path.
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+	 * have to go the slow sendmsg path.
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+	 *
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+	 * Same goes for slab pages: skb_can_coalesce() allows
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+	 * coalescing neighboring slab objects into a single frag which
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+	 * triggers one of hardened usercopy checks.
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 	 */
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-	if (page_count(sg_page(sg)) >= 1 && !recv)
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+	if (!recv && sendpage_ok(sg_page(sg)))
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 		return;
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 	if (recv) {
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@@ -491,7 +489,7 @@
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 	struct iscsi_tcp_task *tcp_task = task->dd_data;
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 	struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)tcp_conn->in.hdr;
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 	int datasn = be32_to_cpu(rhdr->datasn);
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-	unsigned total_in_length = scsi_in(task->sc)->length;
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+	unsigned total_in_length = task->sc->sdb.length;
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 	/*
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 	 * lib iscsi will update this in the completion handling if there
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@@ -576,11 +574,11 @@
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 			      data_length, session->max_burst);
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 	data_offset = be32_to_cpu(rhdr->data_offset);
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-	if (data_offset + data_length > scsi_out(task->sc)->length) {
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+	if (data_offset + data_length > task->sc->sdb.length) {
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 		iscsi_conn_printk(KERN_ERR, conn,
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 				  "invalid R2T with data len %u at offset %u "
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 				  "and total length %d\n", data_length,
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-				  data_offset, scsi_out(task->sc)->length);
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+				  data_offset, task->sc->sdb.length);
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 		return ISCSI_ERR_DATALEN;
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 	}
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@@ -692,7 +690,7 @@
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 		if (tcp_conn->in.datalen) {
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 			struct iscsi_tcp_task *tcp_task = task->dd_data;
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 			struct ahash_request *rx_hash = NULL;
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-			struct scsi_data_buffer *sdb = scsi_in(task->sc);
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+			struct scsi_data_buffer *sdb = &task->sc->sdb;
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 			/*
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 			 * Setup copy of Data-In into the struct scsi_cmnd
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@@ -774,7 +772,7 @@
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 			iscsi_tcp_data_recv_prep(tcp_conn);
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 			return 0;
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 		}
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-	/* fall through */
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+		fallthrough;
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 	case ISCSI_OP_LOGOUT_RSP:
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 	case ISCSI_OP_NOOP_IN:
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 	case ISCSI_OP_SCSI_TMFUNC_RSP: