From patchwork Mon Oct 14 13:36:14 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Selvin Xavier X-Patchwork-Id: 13835082 X-Patchwork-Delegate: jgg@ziepe.ca Received: from mail-pl1-f182.google.com (mail-pl1-f182.google.com [209.85.214.182]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5BFED1AAE32 for ; Mon, 14 Oct 2024 13:57:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.182 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728914231; cv=none; b=Wff7BpfFpUgD/BXeu2IwJ6DuLIeL9acQqjqx6LvzEuNNCY0weAdcvAWHCQXARTe9vLh9eZ9M598YvAC8jsXiPZ3DNRX1PHE4Yna9vFtjHgTGYRClnfC4WDLiVhZANJmQDg49J06BB3aVXJ7F5AD8Syy3Xo3sb9vkD6dcHZqyc7o= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728914231; c=relaxed/simple; bh=9AFS5UoEBlRDR5rVubBsxWWmdKHez4Fh5V0d4S0CvZU=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References; b=kIrVpoyNznT6lT1hDmxA0u3Ldzzv6cDfX20wxUG3+alLVbFMbdbd2nSPzijt9gTe2mGkwfW+4qjj0yCr2OSufw8sutSPH9GcJpKceWI0KOLL3BVXoOxMO4aoAafEd4KIWWWvPQTXtfKiGjqcGb+3vnKYmcHW0kTLm6TMytDCKXI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=broadcom.com; spf=fail smtp.mailfrom=broadcom.com; dkim=pass (1024-bit key) header.d=broadcom.com header.i=@broadcom.com header.b=MDq2xkvh; arc=none smtp.client-ip=209.85.214.182 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=broadcom.com Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=broadcom.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=broadcom.com header.i=@broadcom.com header.b="MDq2xkvh" Received: by mail-pl1-f182.google.com with SMTP id d9443c01a7336-20ceb8bd22fso7655025ad.3 for ; Mon, 14 Oct 2024 06:57:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; t=1728914229; x=1729519029; darn=vger.kernel.org; h=references:in-reply-to:message-id:date:subject:cc:to:from:from:to :cc:subject:date:message-id:reply-to; bh=6Q47Wwlt1a6dXlWE+83kDPV60KfmHLzrqSfAEX3qqyc=; b=MDq2xkvhgMh4M2vXPAsyZNiYMPCZhKuy7LCjAD45GCYAKANBRGlUW7UgdRaXfeTa2m H9l3tFI7pVYLOMNA537qzuV2BhSbUtNExZxhnB0SpSfrkEB1QgrFowC6q4UD7DkcjUgD N3iRs647VQIDnHaJrFNNxQUDsh7eq0lmK4iNY= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1728914229; x=1729519029; h=references:in-reply-to:message-id:date:subject:cc:to:from :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=6Q47Wwlt1a6dXlWE+83kDPV60KfmHLzrqSfAEX3qqyc=; b=dQR9t0ahupFQyOSuY0nlI4iR8JWAxZUkIhyGoNQNjQSA5T+Oo0sS8EmnVgPlS4bKj9 I38v9nRXQFyGm47M8Wx36I4vl1oVQqgQfgPztxKTK3g7Y8dOrjp8Hgk3WiegIPCaecOK VK/R+vKQ4VbU9b0SzdSXoGLDA13uZ/gON+sAhOzYIKCSrIt6pVS+c3ca2DVQVoz8+oIn y+gaNK9x2ZICwm6KhxZpgWqUAlofVDMsaWmVL1Hst7n9ogVJbeZpB/Xx5KtEUSWX6Xvh oTkGJ4j6CLLSsWAT7hZMVgErUpZCPQg+sqc7w2D0O0BBpsCTsk0fRcuFZm8hlUyNGPgH 7Isg== X-Gm-Message-State: AOJu0YzPNK9S5c4CQrUGceMDra7EHlGc3yeBW2elWw/LxmvNw5hZdhkx fBu+g97OTEmbm1xR97X5qT8EF7XVQBlIka48YniC48WSr0RPprkom+mEit8uJQ== X-Google-Smtp-Source: AGHT+IHUupcfT45Q7nQ+rFEQvzhjXzi2SO0Lcxck1DSzA6f/wcmsZtO4eQtXotaAGJSxl8KdBIM5pQ== X-Received: by 2002:a17:902:f68a:b0:20c:f6c5:7f76 with SMTP id d9443c01a7336-20cf6c57fd9mr33905545ad.6.1728914229432; Mon, 14 Oct 2024 06:57:09 -0700 (PDT) Received: from sxavier-dev.dhcp.broadcom.net ([192.19.234.250]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-20c8c35697dsm66129525ad.297.2024.10.14.06.57.06 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 14 Oct 2024 06:57:08 -0700 (PDT) From: Selvin Xavier To: leon@kernel.org, jgg@ziepe.ca Cc: linux-rdma@vger.kernel.org, andrew.gospodarek@broadcom.com, kalesh-anakkur.purayil@broadcom.com, Zhu Yanjun , Selvin Xavier Subject: [PATCH for-rc v3 1/2] RDMA/bnxt_re: Fix the usage of control path spin locks Date: Mon, 14 Oct 2024 06:36:14 -0700 Message-Id: <1728912975-19346-2-git-send-email-selvin.xavier@broadcom.com> X-Mailer: git-send-email 2.5.5 In-Reply-To: <1728912975-19346-1-git-send-email-selvin.xavier@broadcom.com> References: <1728912975-19346-1-git-send-email-selvin.xavier@broadcom.com> Precedence: bulk X-Mailing-List: linux-rdma@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Control path completion processing always runs in tasklet context. To synchronize with the posting thread, there is no need to use the irq variant of spin lock. Use spin_lock_bh instead. Fixes: 1ac5a4047975 ("RDMA/bnxt_re: Add bnxt_re RoCE driver") Signed-off-by: Kalesh AP Signed-off-by: Selvin Xavier --- drivers/infiniband/hw/bnxt_re/qplib_rcfw.c | 25 ++++++++++--------------- 1 file changed, 10 insertions(+), 15 deletions(-) diff --git a/drivers/infiniband/hw/bnxt_re/qplib_rcfw.c b/drivers/infiniband/hw/bnxt_re/qplib_rcfw.c index 7294221..ca26b88 100644 --- a/drivers/infiniband/hw/bnxt_re/qplib_rcfw.c +++ b/drivers/infiniband/hw/bnxt_re/qplib_rcfw.c @@ -290,7 +290,6 @@ static int __send_message(struct bnxt_qplib_rcfw *rcfw, struct bnxt_qplib_hwq *hwq; u32 sw_prod, cmdq_prod; struct pci_dev *pdev; - unsigned long flags; u16 cookie; u8 *preq; @@ -301,7 +300,7 @@ static int __send_message(struct bnxt_qplib_rcfw *rcfw, /* Cmdq are in 16-byte units, each request can consume 1 or more * cmdqe */ - spin_lock_irqsave(&hwq->lock, flags); + spin_lock_bh(&hwq->lock); required_slots = bnxt_qplib_get_cmd_slots(msg->req); free_slots = HWQ_FREE_SLOTS(hwq); cookie = cmdq->seq_num & RCFW_MAX_COOKIE_VALUE; @@ -311,7 +310,7 @@ static int __send_message(struct bnxt_qplib_rcfw *rcfw, dev_info_ratelimited(&pdev->dev, "CMDQ is full req/free %d/%d!", required_slots, free_slots); - spin_unlock_irqrestore(&hwq->lock, flags); + spin_unlock_bh(&hwq->lock); return -EAGAIN; } if (msg->block) @@ -367,7 +366,7 @@ static int __send_message(struct bnxt_qplib_rcfw *rcfw, wmb(); writel(cmdq_prod, cmdq->cmdq_mbox.prod); writel(RCFW_CMDQ_TRIG_VAL, cmdq->cmdq_mbox.db); - spin_unlock_irqrestore(&hwq->lock, flags); + spin_unlock_bh(&hwq->lock); /* Return the CREQ response pointer */ return 0; } @@ -486,7 +485,6 @@ static int __bnxt_qplib_rcfw_send_message(struct bnxt_qplib_rcfw *rcfw, { struct creq_qp_event *evnt = (struct creq_qp_event *)msg->resp; struct bnxt_qplib_crsqe *crsqe; - unsigned long flags; u16 cookie; int rc; u8 opcode; @@ -512,12 +510,12 @@ static int __bnxt_qplib_rcfw_send_message(struct bnxt_qplib_rcfw *rcfw, rc = __poll_for_resp(rcfw, cookie); if (rc) { - spin_lock_irqsave(&rcfw->cmdq.hwq.lock, flags); + spin_lock_bh(&rcfw->cmdq.hwq.lock); crsqe = &rcfw->crsqe_tbl[cookie]; crsqe->is_waiter_alive = false; if (rc == -ENODEV) set_bit(FIRMWARE_STALL_DETECTED, &rcfw->cmdq.flags); - spin_unlock_irqrestore(&rcfw->cmdq.hwq.lock, flags); + spin_unlock_bh(&rcfw->cmdq.hwq.lock); return -ETIMEDOUT; } @@ -628,7 +626,6 @@ static int bnxt_qplib_process_qp_event(struct bnxt_qplib_rcfw *rcfw, u16 cookie, blocked = 0; bool is_waiter_alive; struct pci_dev *pdev; - unsigned long flags; u32 wait_cmds = 0; int rc = 0; @@ -659,8 +656,7 @@ static int bnxt_qplib_process_qp_event(struct bnxt_qplib_rcfw *rcfw, * */ - spin_lock_irqsave_nested(&hwq->lock, flags, - SINGLE_DEPTH_NESTING); + spin_lock_nested(&hwq->lock, SINGLE_DEPTH_NESTING); cookie = le16_to_cpu(qp_event->cookie); blocked = cookie & RCFW_CMD_IS_BLOCKING; cookie &= RCFW_MAX_COOKIE_VALUE; @@ -672,7 +668,7 @@ static int bnxt_qplib_process_qp_event(struct bnxt_qplib_rcfw *rcfw, dev_info(&pdev->dev, "rcfw timedout: cookie = %#x, free_slots = %d", cookie, crsqe->free_slots); - spin_unlock_irqrestore(&hwq->lock, flags); + spin_unlock(&hwq->lock); return rc; } @@ -720,7 +716,7 @@ static int bnxt_qplib_process_qp_event(struct bnxt_qplib_rcfw *rcfw, __destroy_timedout_ah(rcfw, (struct creq_create_ah_resp *) qp_event); - spin_unlock_irqrestore(&hwq->lock, flags); + spin_unlock(&hwq->lock); } *num_wait += wait_cmds; return rc; @@ -734,12 +730,11 @@ static void bnxt_qplib_service_creq(struct tasklet_struct *t) u32 type, budget = CREQ_ENTRY_POLL_BUDGET; struct bnxt_qplib_hwq *hwq = &creq->hwq; struct creq_base *creqe; - unsigned long flags; u32 num_wakeup = 0; u32 hw_polled = 0; /* Service the CREQ until budget is over */ - spin_lock_irqsave(&hwq->lock, flags); + spin_lock_bh(&hwq->lock); while (budget > 0) { creqe = bnxt_qplib_get_qe(hwq, hwq->cons, NULL); if (!CREQ_CMP_VALID(creqe, creq->creq_db.dbinfo.flags)) @@ -782,7 +777,7 @@ static void bnxt_qplib_service_creq(struct tasklet_struct *t) if (hw_polled) bnxt_qplib_ring_nq_db(&creq->creq_db.dbinfo, rcfw->res->cctx, true); - spin_unlock_irqrestore(&hwq->lock, flags); + spin_unlock_bh(&hwq->lock); if (num_wakeup) wake_up_nr(&rcfw->cmdq.waitq, num_wakeup); } From patchwork Mon Oct 14 13:36:15 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Selvin Xavier X-Patchwork-Id: 13835083 X-Patchwork-Delegate: jgg@ziepe.ca Received: from mail-pl1-f173.google.com (mail-pl1-f173.google.com [209.85.214.173]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5308E18453C for ; Mon, 14 Oct 2024 13:57:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.173 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728914234; cv=none; b=RiGZ0DTkHSRkZAsSy1upAdNZikyROZQRJv63lvlnRSSxQVuHdQDenOdMhOwxAXLK+Q8lp3pBT1mQ9unhiNe9t5b5x1aPALHBbiMuRHwtW9c/WdIsQGRkhg2HPXAenA0JS3NB6cjp4VrPCow0cy/utRLL1sI4ka7n7PImTxrbVk0= ARC-Message-Signature: i=1; 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Mon, 14 Oct 2024 06:57:12 -0700 (PDT) Received: from sxavier-dev.dhcp.broadcom.net ([192.19.234.250]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-20c8c35697dsm66129525ad.297.2024.10.14.06.57.09 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 14 Oct 2024 06:57:11 -0700 (PDT) From: Selvin Xavier To: leon@kernel.org, jgg@ziepe.ca Cc: linux-rdma@vger.kernel.org, andrew.gospodarek@broadcom.com, kalesh-anakkur.purayil@broadcom.com, Zhu Yanjun , Selvin Xavier Subject: [PATCH for-rc v3 2/2] RDMA/bnxt_re: synchronize the qp-handle table array Date: Mon, 14 Oct 2024 06:36:15 -0700 Message-Id: <1728912975-19346-3-git-send-email-selvin.xavier@broadcom.com> X-Mailer: git-send-email 2.5.5 In-Reply-To: <1728912975-19346-1-git-send-email-selvin.xavier@broadcom.com> References: <1728912975-19346-1-git-send-email-selvin.xavier@broadcom.com> Precedence: bulk X-Mailing-List: linux-rdma@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: There is a race between the CREQ tasklet and destroy qp when accessing the qp-handle table. There is a chance of reading a valid qp-handle in the CREQ tasklet handler while the QP is already moving ahead with the destruction. Fixing this race by implementing a table-lock to synchronize the access. Fixes: f218d67ef004 ("RDMA/bnxt_re: Allow posting when QPs are in error") Fixes: 84cf229f4001 ("RDMA/bnxt_re: Fix the qp table indexing") Signed-off-by: Kalesh AP Signed-off-by: Selvin Xavier --- drivers/infiniband/hw/bnxt_re/qplib_fp.c | 4 ++++ drivers/infiniband/hw/bnxt_re/qplib_rcfw.c | 13 +++++++++---- drivers/infiniband/hw/bnxt_re/qplib_rcfw.h | 2 ++ 3 files changed, 15 insertions(+), 4 deletions(-) diff --git a/drivers/infiniband/hw/bnxt_re/qplib_fp.c b/drivers/infiniband/hw/bnxt_re/qplib_fp.c index 2ebcb2d..7ad8356 100644 --- a/drivers/infiniband/hw/bnxt_re/qplib_fp.c +++ b/drivers/infiniband/hw/bnxt_re/qplib_fp.c @@ -1532,9 +1532,11 @@ int bnxt_qplib_destroy_qp(struct bnxt_qplib_res *res, u32 tbl_indx; int rc; + spin_lock_bh(&rcfw->tbl_lock); tbl_indx = map_qp_id_to_tbl_indx(qp->id, rcfw); rcfw->qp_tbl[tbl_indx].qp_id = BNXT_QPLIB_QP_ID_INVALID; rcfw->qp_tbl[tbl_indx].qp_handle = NULL; + spin_unlock_bh(&rcfw->tbl_lock); bnxt_qplib_rcfw_cmd_prep((struct cmdq_base *)&req, CMDQ_BASE_OPCODE_DESTROY_QP, @@ -1545,8 +1547,10 @@ int bnxt_qplib_destroy_qp(struct bnxt_qplib_res *res, sizeof(resp), 0); rc = bnxt_qplib_rcfw_send_message(rcfw, &msg); if (rc) { + spin_lock_bh(&rcfw->tbl_lock); rcfw->qp_tbl[tbl_indx].qp_id = qp->id; rcfw->qp_tbl[tbl_indx].qp_handle = qp; + spin_unlock_bh(&rcfw->tbl_lock); return rc; } diff --git a/drivers/infiniband/hw/bnxt_re/qplib_rcfw.c b/drivers/infiniband/hw/bnxt_re/qplib_rcfw.c index ca26b88..e82bd37 100644 --- a/drivers/infiniband/hw/bnxt_re/qplib_rcfw.c +++ b/drivers/infiniband/hw/bnxt_re/qplib_rcfw.c @@ -634,17 +634,21 @@ static int bnxt_qplib_process_qp_event(struct bnxt_qplib_rcfw *rcfw, case CREQ_QP_EVENT_EVENT_QP_ERROR_NOTIFICATION: err_event = (struct creq_qp_error_notification *)qp_event; qp_id = le32_to_cpu(err_event->xid); + spin_lock(&rcfw->tbl_lock); tbl_indx = map_qp_id_to_tbl_indx(qp_id, rcfw); qp = rcfw->qp_tbl[tbl_indx].qp_handle; + if (!qp) { + spin_unlock(&rcfw->tbl_lock); + break; + } + bnxt_qplib_mark_qp_error(qp); + rc = rcfw->creq.aeq_handler(rcfw, qp_event, qp); + spin_unlock(&rcfw->tbl_lock); dev_dbg(&pdev->dev, "Received QP error notification\n"); dev_dbg(&pdev->dev, "qpid 0x%x, req_err=0x%x, resp_err=0x%x\n", qp_id, err_event->req_err_state_reason, err_event->res_err_state_reason); - if (!qp) - break; - bnxt_qplib_mark_qp_error(qp); - rc = rcfw->creq.aeq_handler(rcfw, qp_event, qp); break; default: /* @@ -973,6 +977,7 @@ int bnxt_qplib_alloc_rcfw_channel(struct bnxt_qplib_res *res, GFP_KERNEL); if (!rcfw->qp_tbl) goto fail; + spin_lock_init(&rcfw->tbl_lock); rcfw->max_timeout = res->cctx->hwrm_cmd_max_timeout; diff --git a/drivers/infiniband/hw/bnxt_re/qplib_rcfw.h b/drivers/infiniband/hw/bnxt_re/qplib_rcfw.h index 45996e6..07779ae 100644 --- a/drivers/infiniband/hw/bnxt_re/qplib_rcfw.h +++ b/drivers/infiniband/hw/bnxt_re/qplib_rcfw.h @@ -224,6 +224,8 @@ struct bnxt_qplib_rcfw { struct bnxt_qplib_crsqe *crsqe_tbl; int qp_tbl_size; struct bnxt_qplib_qp_node *qp_tbl; + /* To synchronize the qp-handle hash table */ + spinlock_t tbl_lock; u64 oos_prev; u32 init_oos_stats; u32 cmdq_depth;