From patchwork Tue Apr 25 18:20:50 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Logan Gunthorpe X-Patchwork-Id: 9699235 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id E8B80601D3 for ; Tue, 25 Apr 2017 18:31:58 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id D8F752841D for ; Tue, 25 Apr 2017 18:31:58 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id CD7E228450; Tue, 25 Apr 2017 18:31:58 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 3C80628459 for ; Tue, 25 Apr 2017 18:31:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1953218AbdDYSby (ORCPT ); Tue, 25 Apr 2017 14:31:54 -0400 Received: from ale.deltatee.com ([207.54.116.67]:49745 "EHLO ale.deltatee.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1952025AbdDYSVX (ORCPT ); Tue, 25 Apr 2017 14:21:23 -0400 Received: from cgy1-donard.priv.deltatee.com ([172.16.1.31]) by ale.deltatee.com with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.84_2) (envelope-from ) id 1d355M-0004KK-Gf; Tue, 25 Apr 2017 12:21:16 -0600 Received: from gunthorp by cgy1-donard.priv.deltatee.com with local (Exim 4.84_2) (envelope-from ) id 1d355M-0005rz-AM; Tue, 25 Apr 2017 12:21:12 -0600 From: Logan Gunthorpe To: linux-kernel@vger.kernel.org, linux-crypto@vger.kernel.org, linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, linux-raid@vger.kernel.org, linux-mmc@vger.kernel.org, linux-nvdimm@lists.01.org, linux-scsi@vger.kernel.org, open-iscsi@googlegroups.com, megaraidlinux.pdl@broadcom.com, sparmaintainer@unisys.com, devel@driverdev.osuosl.org, target-devel@vger.kernel.org, netdev@vger.kernel.org, linux-rdma@vger.kernel.org, dm-devel@redhat.com Cc: Christoph Hellwig , "Martin K. Petersen" , "James E.J. Bottomley" , Jens Axboe , Greg Kroah-Hartman , Dan Williams , Ross Zwisler , Matthew Wilcox , Sumit Semwal , Stephen Bates , Logan Gunthorpe , Lee Duncan , Chris Leech Date: Tue, 25 Apr 2017 12:20:50 -0600 Message-Id: <1493144468-22493-4-git-send-email-logang@deltatee.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1493144468-22493-1-git-send-email-logang@deltatee.com> References: <1493144468-22493-1-git-send-email-logang@deltatee.com> X-SA-Exim-Connect-IP: 172.16.1.31 X-SA-Exim-Rcpt-To: dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, linux-nvdimm@lists.01.org, open-iscsi@googlegroups.com, megaraidlinux.pdl@broadcom.com, sparmaintainer@unisys.com, devel@driverdev.osuosl.org, linux-kernel@vger.kernel.org, linux-crypto@vger.kernel.org, linux-media@vger.kernel.org, linux-raid@vger.kernel.org, linux-mmc@vger.kernel.org, linux-scsi@vger.kernel.org, target-devel@vger.kernel.org, netdev@vger.kernel.org, linux-rdma@vger.kernel.org, hch@lst.de, martin.petersen@oracle.com, jejb@linux.vnet.ibm.com, axboe@kernel.dk, gregkh@linuxfoundation.org, dan.j.williams@intel.com, ross.zwisler@linux.intel.com, mawilcox@microsoft.com, sumit.semwal@linaro.org, sbates@raithlin.com, logang@deltatee.com, lduncan@suse.com, dm-devel@redhat.com, cleech@redhat.com X-SA-Exim-Mail-From: gunthorp@deltatee.com Subject: [PATCH v2 03/21] libiscsi: Make use of new the sg_map helper function X-SA-Exim-Version: 4.2.1 (built Mon, 26 Dec 2011 16:24:06 +0000) X-SA-Exim-Scanned: Yes (on ale.deltatee.com) Sender: target-devel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: target-devel@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Convert the kmap and kmap_atomic uses to the sg_map function. We now store the flags for the kmap instead of a boolean to indicate atomicitiy. We use ISCSI_TCP_INTERNAL_ERR error type that was prepared earlier for this. Signed-off-by: Logan Gunthorpe Cc: Lee Duncan Cc: Chris Leech --- drivers/scsi/libiscsi_tcp.c | 32 ++++++++++++++++++++------------ include/scsi/libiscsi_tcp.h | 2 +- 2 files changed, 21 insertions(+), 13 deletions(-) diff --git a/drivers/scsi/libiscsi_tcp.c b/drivers/scsi/libiscsi_tcp.c index 63a1d69..a34e25c 100644 --- a/drivers/scsi/libiscsi_tcp.c +++ b/drivers/scsi/libiscsi_tcp.c @@ -133,25 +133,23 @@ static void iscsi_tcp_segment_map(struct iscsi_segment *segment, int recv) if (page_count(sg_page(sg)) >= 1 && !recv) return; - if (recv) { - segment->atomic_mapped = true; - segment->sg_mapped = kmap_atomic(sg_page(sg)); - } else { - segment->atomic_mapped = false; - /* the xmit path can sleep with the page mapped so use kmap */ - segment->sg_mapped = kmap(sg_page(sg)); + /* the xmit path can sleep with the page mapped so don't use atomic */ + segment->sg_map_flags = recv ? SG_KMAP_ATOMIC : SG_KMAP; + segment->sg_mapped = sg_map(sg, 0, segment->sg_map_flags); + + if (IS_ERR(segment->sg_mapped)) { + segment->sg_mapped = NULL; + return; } - segment->data = segment->sg_mapped + sg->offset + segment->sg_offset; + segment->data = segment->sg_mapped + segment->sg_offset; } void iscsi_tcp_segment_unmap(struct iscsi_segment *segment) { if (segment->sg_mapped) { - if (segment->atomic_mapped) - kunmap_atomic(segment->sg_mapped); - else - kunmap(sg_page(segment->sg)); + sg_unmap(segment->sg, segment->sg_mapped, 0, + segment->sg_map_flags); segment->sg_mapped = NULL; segment->data = NULL; } @@ -304,6 +302,9 @@ iscsi_tcp_segment_recv(struct iscsi_tcp_conn *tcp_conn, break; } + if (segment->data) + return -EFAULT; + copy = min(len - copied, segment->size - segment->copied); ISCSI_DBG_TCP(tcp_conn->iscsi_conn, "copying %d\n", copy); memcpy(segment->data + segment->copied, ptr + copied, copy); @@ -927,6 +928,13 @@ int iscsi_tcp_recv_skb(struct iscsi_conn *conn, struct sk_buff *skb, avail); rc = iscsi_tcp_segment_recv(tcp_conn, segment, ptr, avail); BUG_ON(rc == 0); + if (rc < 0) { + ISCSI_DBG_TCP(conn, "memory fault. Consumed %d\n", + consumed); + *status = ISCSI_TCP_INTERNAL_ERR; + goto skb_done; + } + consumed += rc; if (segment->total_copied >= segment->total_size) { diff --git a/include/scsi/libiscsi_tcp.h b/include/scsi/libiscsi_tcp.h index 90691ad..58c79af 100644 --- a/include/scsi/libiscsi_tcp.h +++ b/include/scsi/libiscsi_tcp.h @@ -47,7 +47,7 @@ struct iscsi_segment { struct scatterlist *sg; void *sg_mapped; unsigned int sg_offset; - bool atomic_mapped; + int sg_map_flags; iscsi_segment_done_fn_t *done; };