From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 178E5C33C9E for ; Thu, 30 Jan 2020 06:05:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DFC02206A2 for ; Thu, 30 Jan 2020 06:05:18 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=broadcom.com header.i=@broadcom.com header.b="SaAKjPj0" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725798AbgA3GFS (ORCPT ); Thu, 30 Jan 2020 01:05:18 -0500 Received: from mail-io1-f68.google.com ([209.85.166.68]:33606 "EHLO mail-io1-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725847AbgA3GFS (ORCPT ); Thu, 30 Jan 2020 01:05:18 -0500 Received: by mail-io1-f68.google.com with SMTP id z8so2713267ioh.0 for ; Wed, 29 Jan 2020 22:05:16 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=WXcNOpKnxQpFC9p0YtSCwY8vkC7znsJwRL+XlmQ08VU=; b=SaAKjPj0F9scUqQeZ3LDM6NPcjp37pJBOmP4+DI0lQLwcEnmI6zsBi+QSH9VB2CXZo fULAu1Y6rOBASW2zUbYvFzH/4JN53jkPCX6HnVZQNeIRRFLTHIkdBBi/vi+jfSb8Wbuo pturiCXoQ7BlMrJmJkc8hY8SHBzgMenhYEV1o= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=WXcNOpKnxQpFC9p0YtSCwY8vkC7znsJwRL+XlmQ08VU=; b=DFMSHb9Hfw0KDVFDVGzxV8glChUf7DkH+HQfPtKXGMVFd36bf4xuvxNTMAwVEvZOJF d3NWtcrLz73Et+7LawKVlGSYEJm9b9NEzNV3JQ01B0XjkX9Ahh/H4HoIh8iTl3gPmaly fwxWALxmsk1HhKUUxhoiFm4ZxMyG8bJPyCDWWHziUljsb6yAnYqqMHLLcTgzjMVhUS6C VcoHejGc9szEpT/29EEvJSTavD6AVufkJZtqkjTDndkZcnCpX5IrdR2OVNoRCR2woMN7 sjCrPLI5Cb7YZYHRTmx69GrGuU8Hlhe4mDkpd5LIpvXERKgLy6PLhmKyG/m9xWjCMJpG OIJQ== X-Gm-Message-State: APjAAAWtpjM72FYvlaBk/DPCuA/Ue0egLxknnFMnOMAD78iWga/WRGHa lCSRBvJjizkpxcLDARm+pNtYJohlJtftTpiBYlP/yQ== X-Google-Smtp-Source: APXvYqyebzgCO9DNj4cbxood9Rg9DwxjqSjuP0aJjjHXKVl5PsYwaGTkqZpBuxKmQ4WVd4PapCj4cGPtk/Rzj94oDXI= X-Received: by 2002:a6b:7113:: with SMTP id q19mr2818850iog.87.1580364316081; Wed, 29 Jan 2020 22:05:16 -0800 (PST) MIME-Version: 1.0 References: <1579845165-18002-1-git-send-email-devesh.sharma@broadcom.com> <1579845165-18002-2-git-send-email-devesh.sharma@broadcom.com> <20200125174645.GC4616@mellanox.com> In-Reply-To: From: Devesh Sharma Date: Thu, 30 Jan 2020 11:34:39 +0530 Message-ID: Subject: Re: [PATCH for-next 1/7] RDMA/bnxt_re: Refactor queue pair creation code To: Jason Gunthorpe Cc: "linux-rdma@vger.kernel.org" , "dledford@redhat.com" Content-Type: text/plain; charset="UTF-8" Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org On Mon, Jan 27, 2020 at 1:43 PM Devesh Sharma wrote: > > On Sat, Jan 25, 2020 at 11:16 PM Jason Gunthorpe wrote: > > > > On Fri, Jan 24, 2020 at 12:52:39AM -0500, Devesh Sharma wrote: > > > +static int bnxt_re_destroy_gsi_sqp(struct bnxt_re_qp *qp) > > > +{ > > > + struct bnxt_re_qp *gsi_sqp; > > > + struct bnxt_re_ah *gsi_sah; > > > + struct bnxt_re_dev *rdev; > > > + int rc = 0; > > > + > > > + rdev = qp->rdev; > > > + gsi_sqp = rdev->gsi_ctx.gsi_sqp; > > > + gsi_sah = rdev->gsi_ctx.gsi_sah; > > > + > > > + /* remove from active qp list */ > > > + mutex_lock(&rdev->qp_lock); > > > + list_del(&gsi_sqp->list); > > > + atomic_dec(&rdev->qp_count); > > > + mutex_unlock(&rdev->qp_lock); > > > + > > > + dev_dbg(rdev_to_dev(rdev), "Destroy the shadow AH\n"); > > > + bnxt_qplib_destroy_ah(&rdev->qplib_res, > > > + &gsi_sah->qplib_ah, > > > + true); > > > + bnxt_qplib_clean_qp(&qp->qplib_qp); > > > + > > > + dev_dbg(rdev_to_dev(rdev), "Destroy the shadow QP\n"); > > > + rc = bnxt_qplib_destroy_qp(&rdev->qplib_res, &gsi_sqp->qplib_qp); > > > + if (rc) { > > > + dev_err(rdev_to_dev(rdev), "Destroy Shadow QP failed"); > > > + goto fail; > > > + } > > > + bnxt_qplib_free_qp_res(&rdev->qplib_res, &gsi_sqp->qplib_qp); > > > + > > > + kfree(rdev->gsi_ctx.sqp_tbl); > > > + kfree(gsi_sah); > > > + kfree(gsi_sqp); > > > + rdev->gsi_ctx.gsi_sqp = NULL; > > > + rdev->gsi_ctx.gsi_sah = NULL; > > > + rdev->gsi_ctx.sqp_tbl = NULL; > > > + > > > + return 0; > > > +fail: > > > + mutex_lock(&rdev->qp_lock); > > > + list_add_tail(&gsi_sqp->list, &rdev->qp_list); > > > + atomic_inc(&rdev->qp_count); > > > + mutex_unlock(&rdev->qp_lock); > > > + return rc; > > > > This error unwind approach looks racy. destroy is not allowed to > > fail, so why all this mess? > True, the unwind is not required, even if the driver wants to keep it > for debugging purpose, the zombie resource would give rise to > confusion. > > > > > /* Queue Pairs */ > > > int bnxt_re_destroy_qp(struct ib_qp *ib_qp, struct ib_udata *udata) > > > { > > > @@ -750,10 +797,18 @@ int bnxt_re_destroy_qp(struct ib_qp *ib_qp, struct ib_udata *udata) > > > unsigned int flags; > > > int rc; > > > > > > + mutex_lock(&rdev->qp_lock); > > > + list_del(&qp->list); > > > + atomic_dec(&rdev->qp_count); > > > + mutex_unlock(&rdev->qp_lock); > > > bnxt_qplib_flush_cqn_wq(&qp->qplib_qp); > > > rc = bnxt_qplib_destroy_qp(&rdev->qplib_res, &qp->qplib_qp); > > > if (rc) { > > > dev_err(rdev_to_dev(rdev), "Failed to destroy HW QP"); > > > + mutex_lock(&rdev->qp_lock); > > > + list_add_tail(&qp->list, &rdev->qp_list); > > > + atomic_inc(&rdev->qp_count); > > > + mutex_unlock(&rdev->qp_lock); > > > return rc; > > > } > > > > More.. > Let me see if I can remove it in this series, else future series would > remove it. Done, removing unwind logic in V2. > > > > Jason