From mboxrd@z Thu Jan 1 00:00:00 1970 From: Gavin Shan Subject: [PATCH net-next 4/8] net/ncsi: Rework request index allocation Date: Thu, 29 Sep 2016 15:03:11 +1000 Message-ID: <1475125395-8459-5-git-send-email-gwshan@linux.vnet.ibm.com> References: <1475125395-8459-1-git-send-email-gwshan@linux.vnet.ibm.com> Cc: davem@davemloft.net, joel@jms.id.au, yuvali@mellanox.com, benh@kernel.crashing.org, Gavin Shan To: netdev@vger.kernel.org Return-path: Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:57277 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752970AbcI2FDX (ORCPT ); Thu, 29 Sep 2016 01:03:23 -0400 Received: from pps.filterd (m0098419.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.17/8.16.0.17) with SMTP id u8T53LAA058917 for ; Thu, 29 Sep 2016 01:03:22 -0400 Received: from e23smtp05.au.ibm.com (e23smtp05.au.ibm.com [202.81.31.147]) by mx0b-001b2d01.pphosted.com with ESMTP id 25rq5x60jv-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Thu, 29 Sep 2016 01:03:22 -0400 Received: from localhost by e23smtp05.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Thu, 29 Sep 2016 15:03:11 +1000 Received: from d23relay09.au.ibm.com (d23relay09.au.ibm.com [9.185.63.181]) by d23dlp03.au.ibm.com (Postfix) with ESMTP id 72E033578067 for ; Thu, 29 Sep 2016 15:03:07 +1000 (EST) Received: from d23av06.au.ibm.com (d23av06.au.ibm.com [9.190.235.151]) by d23relay09.au.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id u8T537Vh11272328 for ; Thu, 29 Sep 2016 15:03:07 +1000 Received: from d23av06.au.ibm.com (localhost [127.0.0.1]) by d23av06.au.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id u8T53612000450 for ; Thu, 29 Sep 2016 15:03:07 +1000 In-Reply-To: <1475125395-8459-1-git-send-email-gwshan@linux.vnet.ibm.com> Sender: netdev-owner@vger.kernel.org List-ID: The NCSI request index (struct ncsi_request::id) is put into instance ID (IID) field while sending NCSI command packet. It was designed the available IDs are given in round-robin fashion. @ndp->request_id was introduced to represent the next available ID, but it has been used as number of successively allocated IDs. It breaks the round-robin design. Besides, we shouldn't put 0 to NCSI command packet's IID field, meaning ID#0 should be reserved according section 6.3.1.1 in NCSI spec (v1.1.0). This fixes above two issues. With it applied, the available IDs will be assigned in round-robin fashion and ID#0 won't be assigned. Signed-off-by: Gavin Shan Reviewed-by: Joel Stanley --- net/ncsi/internal.h | 1 + net/ncsi/ncsi-manage.c | 17 +++++++++-------- 2 files changed, 10 insertions(+), 8 deletions(-) diff --git a/net/ncsi/internal.h b/net/ncsi/internal.h index 66dc851..c956fe8 100644 --- a/net/ncsi/internal.h +++ b/net/ncsi/internal.h @@ -259,6 +259,7 @@ struct ncsi_dev_priv { struct list_head packages; /* List of packages */ struct ncsi_request requests[256]; /* Request table */ unsigned int request_id; /* Last used request ID */ +#define NCSI_REQ_START_IDX 1 unsigned int pending_req_num; /* Number of pending requests */ struct ncsi_package *active_package; /* Currently handled package */ struct ncsi_channel *active_channel; /* Currently handled channel */ diff --git a/net/ncsi/ncsi-manage.c b/net/ncsi/ncsi-manage.c index 3eeb915..64aab38 100644 --- a/net/ncsi/ncsi-manage.c +++ b/net/ncsi/ncsi-manage.c @@ -415,30 +415,31 @@ struct ncsi_request *ncsi_alloc_request(struct ncsi_dev_priv *ndp, bool driven) /* Check if there is one available request until the ceiling */ spin_lock_irqsave(&ndp->lock, flags); - for (i = ndp->request_id; !nr && i < limit; i++) { + for (i = ndp->request_id; i < limit; i++) { if (ndp->requests[i].used) continue; nr = &ndp->requests[i]; nr->used = true; nr->driven = driven; - if (++ndp->request_id >= limit) - ndp->request_id = 0; + ndp->request_id = i + 1; + goto found; } /* Fail back to check from the starting cursor */ - for (i = 0; !nr && i < ndp->request_id; i++) { + for (i = NCSI_REQ_START_IDX; i < ndp->request_id; i++) { if (ndp->requests[i].used) continue; nr = &ndp->requests[i]; nr->used = true; nr->driven = driven; - if (++ndp->request_id >= limit) - ndp->request_id = 0; + ndp->request_id = i + 1; + goto found; } - spin_unlock_irqrestore(&ndp->lock, flags); +found: + spin_unlock_irqrestore(&ndp->lock, flags); return nr; } @@ -1122,7 +1123,7 @@ struct ncsi_dev *ncsi_register_dev(struct net_device *dev, /* Initialize private NCSI device */ spin_lock_init(&ndp->lock); INIT_LIST_HEAD(&ndp->packages); - ndp->request_id = 0; + ndp->request_id = NCSI_REQ_START_IDX; for (i = 0; i < ARRAY_SIZE(ndp->requests); i++) { ndp->requests[i].id = i; ndp->requests[i].ndp = ndp; -- 2.1.0