From patchwork Thu Aug 29 08:36:50 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Souradeep Chakrabarti X-Patchwork-Id: 13782771 Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 7D0C83D6A; Thu, 29 Aug 2024 08:37:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=13.77.154.182 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724920626; cv=none; b=Ij/B2jBikwp91i8uph8Y0d762VOAF83rAXiTZBtvKCVh/sPaIRqnBkqaySU1jqoPAvgfIQIW9YzFSqbyE4vLYD7E0dPrvY4WhaFKT6QIZczAvqMiOaqLq2OMPT1qRMwuAlrx91M2vQt3ePLDrkG4PbhxwXiAXO1oisnR51iMp9A= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724920626; c=relaxed/simple; bh=1h+WeBtsVytlCUWzdY+Woq+1e7PbLK94rU8EPRzpGn4=; h=From:To:Cc:Subject:Date:Message-Id; b=H2hhGwWR7rLfeQ5pZCdX6C8esLINw+UaXkeCgtvrKT5hlewn58/doeKni0+djwEemZxiovRnKv9mik7okWtI6rMkco3lewB9qfh9gAn/9CnqzfIbFqWARQ3plZf4mgEro484BWXiDSk2GNW8jkla540c7rS5ouXETI2baxBbMEQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.microsoft.com; spf=pass smtp.mailfrom=linux.microsoft.com; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b=R90Bo+6E; arc=none smtp.client-ip=13.77.154.182 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.microsoft.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.microsoft.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b="R90Bo+6E" Received: by linux.microsoft.com (Postfix, from userid 1099) id 1725C20B7165; Thu, 29 Aug 2024 01:37:04 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 1725C20B7165 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1724920624; bh=wzjuHwdSxz3Gg3y22vDYhlPDTd1A5vSqMohovQuwOJw=; h=From:To:Cc:Subject:Date:From; b=R90Bo+6EIb9pbEgDLB+fmVPRQs3swvRrJ1NwMhk2/G5ZbhVmgwveJaSf9LWFkngtz h8ahqnw+mcuDtipo+9Egqxiz3hs2FDZBZVM+sWfNk5gZw1f7SlJOZnBFGW7BK07KV8 1zY3J++NsTulZjtE2HI47pt1QHCVYRZ7PA0Q7p7M= From: Souradeep Chakrabarti To: kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, davem@davemloft.net, longli@microsoft.com, ssengar@linux.microsoft.com, linux-hyperv@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org Cc: schakrabarti@microsoft.com, Souradeep Chakrabarti , stable@vger.kernel.org Subject: [PATCH V3 net] net: mana: Fix error handling in mana_create_txq/rxq's NAPI cleanup Date: Thu, 29 Aug 2024 01:36:50 -0700 Message-Id: <1724920610-15546-1-git-send-email-schakrabarti@linux.microsoft.com> X-Mailer: git-send-email 1.8.3.1 Precedence: bulk X-Mailing-List: linux-rdma@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Currently napi_disable() gets called during rxq and txq cleanup, even before napi is enabled and hrtimer is initialized. It causes kernel panic. ? page_fault_oops+0x136/0x2b0 ? page_counter_cancel+0x2e/0x80 ? do_user_addr_fault+0x2f2/0x640 ? refill_obj_stock+0xc4/0x110 ? exc_page_fault+0x71/0x160 ? asm_exc_page_fault+0x27/0x30 ? __mmdrop+0x10/0x180 ? __mmdrop+0xec/0x180 ? hrtimer_active+0xd/0x50 hrtimer_try_to_cancel+0x2c/0xf0 hrtimer_cancel+0x15/0x30 napi_disable+0x65/0x90 mana_destroy_rxq+0x4c/0x2f0 mana_create_rxq.isra.0+0x56c/0x6d0 ? mana_uncfg_vport+0x50/0x50 mana_alloc_queues+0x21b/0x320 ? skb_dequeue+0x5f/0x80 Cc: stable@vger.kernel.org Fixes: e1b5683ff62e ("net: mana: Move NAPI from EQ to CQ") Signed-off-by: Souradeep Chakrabarti Reviewed-by: Haiyang Zhang Reviewed-by: Shradha Gupta --- V3 -> V2: Instead of using napi internal attribute, using an atomic attribute to verify napi is initialized for a particular txq / rxq. V2 -> V1: Addressed the comment on cleaning up napi for the queues, where queue creation was successful. --- drivers/net/ethernet/microsoft/mana/mana_en.c | 30 ++++++++++++------- include/net/mana/mana.h | 4 +++ 2 files changed, 24 insertions(+), 10 deletions(-) diff --git a/drivers/net/ethernet/microsoft/mana/mana_en.c b/drivers/net/ethernet/microsoft/mana/mana_en.c index 39f56973746d..bd303c89cfa6 100644 --- a/drivers/net/ethernet/microsoft/mana/mana_en.c +++ b/drivers/net/ethernet/microsoft/mana/mana_en.c @@ -1872,10 +1872,12 @@ static void mana_destroy_txq(struct mana_port_context *apc) for (i = 0; i < apc->num_queues; i++) { napi = &apc->tx_qp[i].tx_cq.napi; - napi_synchronize(napi); - napi_disable(napi); - netif_napi_del(napi); - + if (atomic_read(&apc->tx_qp[i].txq.napi_initialized)) { + napi_synchronize(napi); + napi_disable(napi); + netif_napi_del(napi); + atomic_set(&apc->tx_qp[i].txq.napi_initialized, 0); + } mana_destroy_wq_obj(apc, GDMA_SQ, apc->tx_qp[i].tx_object); mana_deinit_cq(apc, &apc->tx_qp[i].tx_cq); @@ -1931,6 +1933,7 @@ static int mana_create_txq(struct mana_port_context *apc, txq->ndev = net; txq->net_txq = netdev_get_tx_queue(net, i); txq->vp_offset = apc->tx_vp_offset; + atomic_set(&txq->napi_initialized, 0); skb_queue_head_init(&txq->pending_skbs); memset(&spec, 0, sizeof(spec)); @@ -1997,6 +2000,7 @@ static int mana_create_txq(struct mana_port_context *apc, netif_napi_add_tx(net, &cq->napi, mana_poll); napi_enable(&cq->napi); + atomic_set(&txq->napi_initialized, 1); mana_gd_ring_cq(cq->gdma_cq, SET_ARM_BIT); } @@ -2023,14 +2027,18 @@ static void mana_destroy_rxq(struct mana_port_context *apc, napi = &rxq->rx_cq.napi; - if (validate_state) - napi_synchronize(napi); + if (atomic_read(&rxq->napi_initialized)) { - napi_disable(napi); + if (validate_state) + napi_synchronize(napi); - xdp_rxq_info_unreg(&rxq->xdp_rxq); + napi_disable(napi); - netif_napi_del(napi); + netif_napi_del(napi); + atomic_set(&rxq->napi_initialized, 0); + } + + xdp_rxq_info_unreg(&rxq->xdp_rxq); mana_destroy_wq_obj(apc, GDMA_RQ, rxq->rxobj); @@ -2199,6 +2207,7 @@ static struct mana_rxq *mana_create_rxq(struct mana_port_context *apc, rxq->num_rx_buf = RX_BUFFERS_PER_QUEUE; rxq->rxq_idx = rxq_idx; rxq->rxobj = INVALID_MANA_HANDLE; + atomic_set(&rxq->napi_initialized, 0); mana_get_rxbuf_cfg(ndev->mtu, &rxq->datasize, &rxq->alloc_size, &rxq->headroom); @@ -2286,6 +2295,8 @@ static struct mana_rxq *mana_create_rxq(struct mana_port_context *apc, napi_enable(&cq->napi); + atomic_set(&rxq->napi_initialized, 1); + mana_gd_ring_cq(cq->gdma_cq, SET_ARM_BIT); out: if (!err) @@ -2336,7 +2347,6 @@ static void mana_destroy_vport(struct mana_port_context *apc) rxq = apc->rxqs[rxq_idx]; if (!rxq) continue; - mana_destroy_rxq(apc, rxq, true); apc->rxqs[rxq_idx] = NULL; } diff --git a/include/net/mana/mana.h b/include/net/mana/mana.h index 7caa334f4888..be75abd63dc8 100644 --- a/include/net/mana/mana.h +++ b/include/net/mana/mana.h @@ -98,6 +98,8 @@ struct mana_txq { atomic_t pending_sends; + atomic_t napi_initialized; + struct mana_stats_tx stats; }; @@ -335,6 +337,8 @@ struct mana_rxq { bool xdp_flush; int xdp_rc; /* XDP redirect return code */ + atomic_t napi_initialized; + struct page_pool *page_pool; /* MUST BE THE LAST MEMBER: