From patchwork Thu Nov 3 19:16:21 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Long Li X-Patchwork-Id: 13030897 X-Patchwork-Delegate: kuba@kernel.org Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id F1F0CC4167B for ; Thu, 3 Nov 2022 19:17:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231645AbiKCTRO (ORCPT ); Thu, 3 Nov 2022 15:17:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55780 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231418AbiKCTQ5 (ORCPT ); Thu, 3 Nov 2022 15:16:57 -0400 Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 4F4851F9EA; Thu, 3 Nov 2022 12:16:55 -0700 (PDT) Received: by linux.microsoft.com (Postfix, from userid 1004) id 1E40D20C28B1; Thu, 3 Nov 2022 12:16:55 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 1E40D20C28B1 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxonhyperv.com; s=default; t=1667503015; bh=bXAXXXWrR9V+EThSaWjY7kZ/dnC9Y8q0qjq9clyypqg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:Reply-To:From; b=XiAgn4pxPOH6OgLf1/S5XOkxqHq6BhEV7jqpLeGARodeU1ci9ELhIxcUcLirL4ebU uyUbu/nx+vU2XY81RLNUz5+IU3LLBuIgXzJnX7aUa0axG8Q7FRVXpOhh9HFC9BChV9 g92jkg7Uoe5oUeMMU6Q1haWqHhAN8Act3/gASg5I= From: longli@linuxonhyperv.com To: "K. Y. Srinivasan" , Haiyang Zhang , Stephen Hemminger , Wei Liu , Dexuan Cui , "David S. Miller" , Jakub Kicinski , Paolo Abeni , Jason Gunthorpe , Leon Romanovsky , edumazet@google.com, shiraz.saleem@intel.com, Ajay Sharma Cc: linux-hyperv@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org, Long Li Subject: [Patch v10 03/12] net: mana: Handle vport sharing between devices Date: Thu, 3 Nov 2022 12:16:21 -0700 Message-Id: <1667502990-2559-4-git-send-email-longli@linuxonhyperv.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1667502990-2559-1-git-send-email-longli@linuxonhyperv.com> References: <1667502990-2559-1-git-send-email-longli@linuxonhyperv.com> Reply-To: longli@microsoft.com Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org From: Long Li For outgoing packets, the PF requires the VF to configure the vport with corresponding protection domain and doorbell ID for the kernel or user context. The vport can't be shared between different contexts. Implement the logic to exclusively take over the vport by either the Ethernet device or RDMA device. Reviewed-by: Dexuan Cui Signed-off-by: Long Li Acked-by: Haiyang Zhang --- Change log: v2: use refcount instead of directly using atomic variables v4: change to mutex to avoid possible race with refcount v5: add detailed comments explaining vport sharing, use EXPORT_SYMBOL_NS v6: rebased to rdma-next drivers/net/ethernet/microsoft/mana/mana.h | 7 +++ drivers/net/ethernet/microsoft/mana/mana_en.c | 53 ++++++++++++++++++- 2 files changed, 58 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/microsoft/mana/mana.h b/drivers/net/ethernet/microsoft/mana/mana.h index d58be64374c8..2883a08dbfb5 100644 --- a/drivers/net/ethernet/microsoft/mana/mana.h +++ b/drivers/net/ethernet/microsoft/mana/mana.h @@ -380,6 +380,10 @@ struct mana_port_context { mana_handle_t port_handle; mana_handle_t pf_filter_handle; + /* Mutex for sharing access to vport_use_count */ + struct mutex vport_mutex; + int vport_use_count; + u16 port_idx; bool port_is_up; @@ -631,4 +635,7 @@ struct mana_tx_package { struct gdma_posted_wqe_info wqe_info; }; +int mana_cfg_vport(struct mana_port_context *apc, u32 protection_dom_id, + u32 doorbell_pg_id); +void mana_uncfg_vport(struct mana_port_context *apc); #endif /* _MANA_H */ diff --git a/drivers/net/ethernet/microsoft/mana/mana_en.c b/drivers/net/ethernet/microsoft/mana/mana_en.c index 8751e475d1ba..efe14a343fd1 100644 --- a/drivers/net/ethernet/microsoft/mana/mana_en.c +++ b/drivers/net/ethernet/microsoft/mana/mana_en.c @@ -646,13 +646,48 @@ static int mana_query_vport_cfg(struct mana_port_context *apc, u32 vport_index, return 0; } -static int mana_cfg_vport(struct mana_port_context *apc, u32 protection_dom_id, - u32 doorbell_pg_id) +void mana_uncfg_vport(struct mana_port_context *apc) +{ + mutex_lock(&apc->vport_mutex); + apc->vport_use_count--; + WARN_ON(apc->vport_use_count < 0); + mutex_unlock(&apc->vport_mutex); +} +EXPORT_SYMBOL_NS(mana_uncfg_vport, NET_MANA); + +int mana_cfg_vport(struct mana_port_context *apc, u32 protection_dom_id, + u32 doorbell_pg_id) { struct mana_config_vport_resp resp = {}; struct mana_config_vport_req req = {}; int err; + /* This function is used to program the Ethernet port in the hardware + * table. It can be called from the Ethernet driver or the RDMA driver. + * + * For Ethernet usage, the hardware supports only one active user on a + * physical port. The driver checks on the port usage before programming + * the hardware when creating the RAW QP (RDMA driver) or exposing the + * device to kernel NET layer (Ethernet driver). + * + * Because the RDMA driver doesn't know in advance which QP type the + * user will create, it exposes the device with all its ports. The user + * may not be able to create RAW QP on a port if this port is already + * in used by the Ethernet driver from the kernel. + * + * This physical port limitation only applies to the RAW QP. For RC QP, + * the hardware doesn't have this limitation. The user can create RC + * QPs on a physical port up to the hardware limits independent of the + * Ethernet usage on the same port. + */ + mutex_lock(&apc->vport_mutex); + if (apc->vport_use_count > 0) { + mutex_unlock(&apc->vport_mutex); + return -EBUSY; + } + apc->vport_use_count++; + mutex_unlock(&apc->vport_mutex); + mana_gd_init_req_hdr(&req.hdr, MANA_CONFIG_VPORT_TX, sizeof(req), sizeof(resp)); req.vport = apc->port_handle; @@ -679,9 +714,16 @@ static int mana_cfg_vport(struct mana_port_context *apc, u32 protection_dom_id, apc->tx_shortform_allowed = resp.short_form_allowed; apc->tx_vp_offset = resp.tx_vport_offset; + + netdev_info(apc->ndev, "Configured vPort %llu PD %u DB %u\n", + apc->port_handle, protection_dom_id, doorbell_pg_id); out: + if (err) + mana_uncfg_vport(apc); + return err; } +EXPORT_SYMBOL_NS(mana_cfg_vport, NET_MANA); static int mana_cfg_vport_steering(struct mana_port_context *apc, enum TRI_STATE rx, @@ -742,6 +784,9 @@ static int mana_cfg_vport_steering(struct mana_port_context *apc, resp.hdr.status); err = -EPROTO; } + + netdev_info(ndev, "Configured steering vPort %llu entries %u\n", + apc->port_handle, num_entries); out: kfree(req); return err; @@ -1804,6 +1849,7 @@ static void mana_destroy_vport(struct mana_port_context *apc) } mana_destroy_txq(apc); + mana_uncfg_vport(apc); if (gd->gdma_context->is_pf) mana_pf_deregister_hw_vport(apc); @@ -2076,6 +2122,9 @@ static int mana_probe_port(struct mana_context *ac, int port_idx, apc->pf_filter_handle = INVALID_MANA_HANDLE; apc->port_idx = port_idx; + mutex_init(&apc->vport_mutex); + apc->vport_use_count = 0; + ndev->netdev_ops = &mana_devops; ndev->ethtool_ops = &mana_ethtool_ops; ndev->mtu = ETH_DATA_LEN;