From mboxrd@z Thu Jan 1 00:00:00 1970 From: Robert Love Subject: [PATCH 1/4] libfcoe: Fix Conflicting FCFs issue in the fabric Date: Tue, 21 May 2013 10:44:33 -0700 Message-ID: <20130521174433.3033.92637.stgit@fritz> References: <20130521174426.3033.16298.stgit@fritz> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Return-path: Received: from mga02.intel.com ([134.134.136.20]:47161 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754692Ab3EURog (ORCPT ); Tue, 21 May 2013 13:44:36 -0400 In-Reply-To: <20130521174426.3033.16298.stgit@fritz> Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: linux-scsi@vger.kernel.org Cc: Krishna Mohan , Bhanu Prakash Gollapudi From: Krishna Mohan When multiple FCFs in use, and first FIP Advertisement received is with "Available for Login" i.e A bit set to 0, FCF selection will fail. The fix is to remove the assumption in the code that first FCF is only allowed selectable FCF. Consider the scenario fip->fcfs contains FCF1(fabricname X, marked A=0) FCF2(fabricname Y, marked A=1). list_first_entry(first) points to FCF1 and 1st iteration we ignore the FCF and on 2nd iteration we compare FCF1 & FCF2 fabric name and we fails to perform FCF selection. Signed-off-by: Krishna Mohan Reviewed-by: Bhanu Prakash Gollapudi Signed-off-by: Robert Love --- drivers/scsi/fcoe/fcoe_ctlr.c | 15 +++++---------- 1 file changed, 5 insertions(+), 10 deletions(-) diff --git a/drivers/scsi/fcoe/fcoe_ctlr.c b/drivers/scsi/fcoe/fcoe_ctlr.c index a762472..4c77641 100644 --- a/drivers/scsi/fcoe/fcoe_ctlr.c +++ b/drivers/scsi/fcoe/fcoe_ctlr.c @@ -1548,9 +1548,6 @@ static struct fcoe_fcf *fcoe_ctlr_select(struct fcoe_ctlr *fip) { struct fcoe_fcf *fcf; struct fcoe_fcf *best = fip->sel_fcf; - struct fcoe_fcf *first; - - first = list_first_entry(&fip->fcfs, struct fcoe_fcf, list); list_for_each_entry(fcf, &fip->fcfs, list) { LIBFCOE_FIP_DBG(fip, "consider FCF fab %16.16llx " @@ -1568,17 +1565,15 @@ static struct fcoe_fcf *fcoe_ctlr_select(struct fcoe_ctlr *fip) "" : "un"); continue; } - if (fcf->fabric_name != first->fabric_name || - fcf->vfid != first->vfid || - fcf->fc_map != first->fc_map) { + if (!best || fcf->pri < best->pri || best->flogi_sent) + best = fcf; + if (fcf->fabric_name != best->fabric_name || + fcf->vfid != best->vfid || + fcf->fc_map != best->fc_map) { LIBFCOE_FIP_DBG(fip, "Conflicting fabric, VFID, " "or FC-MAP\n"); return NULL; } - if (fcf->flogi_sent) - continue; - if (!best || fcf->pri < best->pri || best->flogi_sent) - best = fcf; } fip->sel_fcf = best; if (best) {