From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756050AbdDMWPT (ORCPT ); Thu, 13 Apr 2017 18:15:19 -0400 Received: from ale.deltatee.com ([207.54.116.67]:38199 "EHLO ale.deltatee.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752879AbdDMWG2 (ORCPT ); Thu, 13 Apr 2017 18:06:28 -0400 From: Logan Gunthorpe To: Christoph Hellwig , "Martin K. Petersen" , Sagi Grimberg , Jens Axboe , Tejun Heo , Greg Kroah-Hartman , Dan Williams , Ross Zwisler , Matthew Wilcox , Sumit Semwal , Ming Lin , linux-kernel@vger.kernel.org, linux-crypto@vger.kernel.org, linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, intel-gfx@lists.freedesktop.org, linux-raid@vger.kernel.org, linux-mmc@vger.kernel.org, linux-nvme@lists.infradead.org, linux-nvdimm@ml01.01.org, linux-scsi@vger.kernel.org, fcoe-devel@open-fcoe.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, rds-devel@oss.oracle.com Cc: Steve Wise , Stephen Bates , Logan Gunthorpe Date: Thu, 13 Apr 2017 16:05:16 -0600 Message-Id: <1492121135-4437-4-git-send-email-logang@deltatee.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1492121135-4437-1-git-send-email-logang@deltatee.com> References: <1492121135-4437-1-git-send-email-logang@deltatee.com> X-SA-Exim-Connect-IP: 172.16.1.31 X-SA-Exim-Rcpt-To: hch@lst.de, martin.petersen@oracle.com, sagi@grimberg.me, axboe@kernel.dk, tj@kernel.org, gregkh@linuxfoundation.org, dan.j.williams@intel.com, ross.zwisler@linux.intel.com, mawilcox@microsoft.com, sumit.semwal@linaro.org, ming.l@ssi.samsung.com, linaro-mm-sig@lists.linaro.org, dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, linux-nvme@lists.infradead.org, linux-nvdimm@lists.01.org, fcoe-devel@open-fcoe.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, rds-devel@oss.oracle.com, swise@opengridcomputing.com, sbates@raithlin.com, logang@deltatee.com X-SA-Exim-Mail-From: gunthorp@deltatee.com Subject: [PATCH 03/22] 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: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 also propogate a possible kmap error down and create a new ISCSI_TCP_INTERNAL_ERR error type for this. Signed-off-by: Logan Gunthorpe --- drivers/scsi/cxgbi/libcxgbi.c | 5 +++++ drivers/scsi/libiscsi_tcp.c | 32 ++++++++++++++++++++------------ include/scsi/libiscsi_tcp.h | 3 ++- 3 files changed, 27 insertions(+), 13 deletions(-) diff --git a/drivers/scsi/cxgbi/libcxgbi.c b/drivers/scsi/cxgbi/libcxgbi.c index bd7d39e..e38d0c1 100644 --- a/drivers/scsi/cxgbi/libcxgbi.c +++ b/drivers/scsi/cxgbi/libcxgbi.c @@ -1556,6 +1556,11 @@ static inline int read_pdu_skb(struct iscsi_conn *conn, */ iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb."); return -EFAULT; + case ISCSI_TCP_INTERNAL_ERR: + pr_info("skb 0x%p, off %u, %d, TCP_INTERNAL_ERR.\n", + skb, offset, offloaded); + iscsi_conn_printk(KERN_ERR, conn, "Internal error."); + return -EFAULT; case ISCSI_TCP_SEGMENT_DONE: log_debug(1 << CXGBI_DBG_PDU_RX, "skb 0x%p, off %u, %d, TCP_SEG_DONE, rc %d.\n", diff --git a/drivers/scsi/libiscsi_tcp.c b/drivers/scsi/libiscsi_tcp.c index 63a1d69..a2427699 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, 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, + 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 30520d5..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; }; @@ -92,6 +92,7 @@ enum { ISCSI_TCP_SKB_DONE, /* skb is out of data */ ISCSI_TCP_CONN_ERR, /* iscsi layer has fired a conn err */ ISCSI_TCP_SUSPENDED, /* conn is suspended */ + ISCSI_TCP_INTERNAL_ERR, /* an internal error occurred */ }; extern void iscsi_tcp_hdr_recv_prep(struct iscsi_tcp_conn *tcp_conn); -- 2.1.4