From patchwork Wed Sep 1 18:05:43 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sukadev Bhattiprolu X-Patchwork-Id: 12470063 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 X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 4FF4AC4320E for ; Wed, 1 Sep 2021 18:05:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2C1DD60525 for ; Wed, 1 Sep 2021 18:05:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345472AbhIASGz (ORCPT ); Wed, 1 Sep 2021 14:06:55 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:60426 "EHLO mx0b-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235904AbhIASGy (ORCPT ); Wed, 1 Sep 2021 14:06:54 -0400 Received: from pps.filterd (m0098421.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.43/8.16.0.43) with SMTP id 181I2eFk031076 for ; Wed, 1 Sep 2021 14:05:56 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=pp1; bh=gNwRShj1fCPOjbvcZzcbmqfKAtdoDisxZvVIpOU9ySc=; b=htDFt8TfRxY/e4d20J60uPEgZtdVBNxxUELzslQadvGIlPrhpmRQ5ZhQuNC79tljxQnR mTaa2QIugWtAVHuU0BSnt3drQVE6tmWNvQT2FFAlfyd/hay4Csz42FoTHWygpmQT0Iy9 5TxBvgsFTKPbrnQGOQ+M+whdBvs/PX7c70peGm1dL51BTDUDxZZDk/nM1P6gdtsPy+U0 LXsOTS04db6cHyfN8hYrFt6VHMrPGfjG1RQxbV36F1sS66d8reLmUohWP5MNSUb9JZQS mbc/bU9SP5RkpHWuYnqGBMNU2YZIjtMBVj8O1cqQExwZhcy/3pDkiqYyDYVTtEo4wpGv Dw== Received: from ppma03dal.us.ibm.com (b.bd.3ea9.ip4.static.sl-reverse.com [169.62.189.11]) by mx0a-001b2d01.pphosted.com with ESMTP id 3ate1arss6-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT) for ; Wed, 01 Sep 2021 14:05:56 -0400 Received: from pps.filterd (ppma03dal.us.ibm.com [127.0.0.1]) by ppma03dal.us.ibm.com (8.16.1.2/8.16.1.2) with SMTP id 181I43LI023180 for ; Wed, 1 Sep 2021 18:05:56 GMT Received: from b01cxnp22033.gho.pok.ibm.com (b01cxnp22033.gho.pok.ibm.com [9.57.198.23]) by ppma03dal.us.ibm.com with ESMTP id 3atdxbgwwx-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT) for ; Wed, 01 Sep 2021 18:05:56 +0000 Received: from b01ledav002.gho.pok.ibm.com (b01ledav002.gho.pok.ibm.com [9.57.199.107]) by b01cxnp22033.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 181I5sNF38928746 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 1 Sep 2021 18:05:54 GMT Received: from b01ledav002.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 71CA312405B; Wed, 1 Sep 2021 18:05:54 +0000 (GMT) Received: from b01ledav002.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 5C48212405A; Wed, 1 Sep 2021 18:05:53 +0000 (GMT) Received: from suka-w540.ibmuc.com (unknown [9.160.152.143]) by b01ledav002.gho.pok.ibm.com (Postfix) with ESMTP; Wed, 1 Sep 2021 18:05:53 +0000 (GMT) From: Sukadev Bhattiprolu To: netdev@vger.kernel.org Cc: Brian King , cforno12@linux.ibm.com, Dany Madden , Rick Lindsley , Rick Lindsley Subject: [PATCH net-next v2 1/9] ibmvnic: Consolidate code in replenish_rx_pool() Date: Wed, 1 Sep 2021 11:05:43 -0700 Message-Id: <20210901180551.150126-2-sukadev@linux.ibm.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210901180551.150126-1-sukadev@linux.ibm.com> References: <20210901180551.150126-1-sukadev@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: BCPkvWMpjVyN71YmsmEKXYCiZuBu_pHn X-Proofpoint-GUID: BCPkvWMpjVyN71YmsmEKXYCiZuBu_pHn X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391,18.0.790 definitions=2021-09-01_05:2021-09-01,2021-09-01 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 mlxscore=0 lowpriorityscore=0 bulkscore=0 clxscore=1015 suspectscore=0 spamscore=0 malwarescore=0 adultscore=0 phishscore=0 impostorscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2108310000 definitions=main-2109010104 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org For better readability, consolidate related code in replenish_rx_pool() and add some comments. Reviewed-by: Rick Lindsley Reviewed-by: Dany Madden Signed-off-by: Sukadev Bhattiprolu --- drivers/net/ethernet/ibm/ibmvnic.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c index a775c69e4fd7..e8b1231be485 100644 --- a/drivers/net/ethernet/ibm/ibmvnic.c +++ b/drivers/net/ethernet/ibm/ibmvnic.c @@ -371,6 +371,8 @@ static void replenish_rx_pool(struct ibmvnic_adapter *adapter, } index = pool->free_map[pool->next_free]; + pool->free_map[pool->next_free] = IBMVNIC_INVALID_MAP; + pool->next_free = (pool->next_free + 1) % pool->size; if (pool->rx_buff[index].skb) dev_err(dev, "Inconsistent free_map!\n"); @@ -380,14 +382,15 @@ static void replenish_rx_pool(struct ibmvnic_adapter *adapter, dst = pool->long_term_buff.buff + offset; memset(dst, 0, pool->buff_size); dma_addr = pool->long_term_buff.addr + offset; - pool->rx_buff[index].data = dst; - pool->free_map[pool->next_free] = IBMVNIC_INVALID_MAP; + /* add the skb to an rx_buff in the pool */ + pool->rx_buff[index].data = dst; pool->rx_buff[index].dma = dma_addr; pool->rx_buff[index].skb = skb; pool->rx_buff[index].pool_index = pool->index; pool->rx_buff[index].size = pool->buff_size; + /* queue the rx_buff for the next send_subcrq_indirect */ sub_crq = &ind_bufp->indir_arr[ind_bufp->index++]; memset(sub_crq, 0, sizeof(*sub_crq)); sub_crq->rx_add.first = IBMVNIC_CRQ_CMD; @@ -405,7 +408,8 @@ static void replenish_rx_pool(struct ibmvnic_adapter *adapter, shift = 8; #endif sub_crq->rx_add.len = cpu_to_be32(pool->buff_size << shift); - pool->next_free = (pool->next_free + 1) % pool->size; + + /* if send_subcrq_indirect queue is full, flush to VIOS */ if (ind_bufp->index == IBMVNIC_MAX_IND_DESCS || i == count - 1) { lpar_rc = From patchwork Wed Sep 1 18:05:44 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sukadev Bhattiprolu X-Patchwork-Id: 12470065 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 X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 19D23C432BE for ; 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Wed, 1 Sep 2021 18:05:54 +0000 (GMT) From: Sukadev Bhattiprolu To: netdev@vger.kernel.org Cc: Brian King , cforno12@linux.ibm.com, Dany Madden , Rick Lindsley , Rick Lindsley Subject: [PATCH net-next v2 2/9] ibmvnic: Fix up some comments and messages Date: Wed, 1 Sep 2021 11:05:44 -0700 Message-Id: <20210901180551.150126-3-sukadev@linux.ibm.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210901180551.150126-1-sukadev@linux.ibm.com> References: <20210901180551.150126-1-sukadev@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: 3Qh7kFjzbGBBN-zEeRqSp6R_QfTd_eIe X-Proofpoint-ORIG-GUID: 3Qh7kFjzbGBBN-zEeRqSp6R_QfTd_eIe X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391,18.0.790 definitions=2021-09-01_05:2021-09-01,2021-09-01 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 lowpriorityscore=0 malwarescore=0 mlxscore=0 spamscore=0 impostorscore=0 mlxlogscore=999 clxscore=1015 phishscore=0 priorityscore=1501 suspectscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2107140000 definitions=main-2109010104 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org Add/update some comments/function headers and fix up some messages. Reviewed-by: Rick Lindsley Reviewed-by: Dany Madden Signed-off-by: Sukadev Bhattiprolu --- Changelog [v2]: [Jakub Kicinski] Fix kdoc issues --- drivers/net/ethernet/ibm/ibmvnic.c | 44 ++++++++++++++++++++++++++---- 1 file changed, 38 insertions(+), 6 deletions(-) diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c index e8b1231be485..cd04c3eb6c41 100644 --- a/drivers/net/ethernet/ibm/ibmvnic.c +++ b/drivers/net/ethernet/ibm/ibmvnic.c @@ -243,14 +243,13 @@ static int alloc_long_term_buff(struct ibmvnic_adapter *adapter, rc = ibmvnic_wait_for_completion(adapter, &adapter->fw_done, 10000); if (rc) { - dev_err(dev, - "Long term map request aborted or timed out,rc = %d\n", + dev_err(dev, "LTB map request aborted or timed out, rc = %d\n", rc); goto out; } if (adapter->fw_done_rc) { - dev_err(dev, "Couldn't map long term buffer,rc = %d\n", + dev_err(dev, "Couldn't map LTB, rc = %d\n", adapter->fw_done_rc); rc = -1; goto out; @@ -281,7 +280,9 @@ static void free_long_term_buff(struct ibmvnic_adapter *adapter, adapter->reset_reason != VNIC_RESET_MOBILITY && adapter->reset_reason != VNIC_RESET_TIMEOUT) send_request_unmap(adapter, ltb->map_id); + dma_free_coherent(dev, ltb->size, ltb->buff, ltb->addr); + ltb->buff = NULL; ltb->map_id = 0; } @@ -574,6 +575,12 @@ static int reset_rx_pools(struct ibmvnic_adapter *adapter) return 0; } +/** + * release_rx_pools() - Release any rx pools attached to @adapter. + * @adapter: ibmvnic adapter + * + * Safe to call this multiple times - even if no pools are attached. + */ static void release_rx_pools(struct ibmvnic_adapter *adapter) { struct ibmvnic_rx_pool *rx_pool; @@ -628,6 +635,9 @@ static int init_rx_pools(struct net_device *netdev) return -1; } + /* Set num_active_rx_pools early. If we fail below after partial + * allocation, release_rx_pools() will know how many to look for. + */ adapter->num_active_rx_pools = rxadd_subcrqs; for (i = 0; i < rxadd_subcrqs; i++) { @@ -646,6 +656,7 @@ static int init_rx_pools(struct net_device *netdev) rx_pool->free_map = kcalloc(rx_pool->size, sizeof(int), GFP_KERNEL); if (!rx_pool->free_map) { + dev_err(dev, "Couldn't alloc free_map %d\n", i); release_rx_pools(adapter); return -1; } @@ -739,10 +750,19 @@ static void release_one_tx_pool(struct ibmvnic_adapter *adapter, free_long_term_buff(adapter, &tx_pool->long_term_buff); } +/** + * release_tx_pools() - Release any tx pools attached to @adapter. + * @adapter: ibmvnic adapter + * + * Safe to call this multiple times - even if no pools are attached. + */ static void release_tx_pools(struct ibmvnic_adapter *adapter) { int i; + /* init_tx_pools() ensures that ->tx_pool and ->tso_pool are + * both NULL or both non-NULL. So we only need to check one. + */ if (!adapter->tx_pool) return; @@ -793,6 +813,7 @@ static int init_one_tx_pool(struct net_device *netdev, static int init_tx_pools(struct net_device *netdev) { struct ibmvnic_adapter *adapter = netdev_priv(netdev); + struct device *dev = &adapter->vdev->dev; int tx_subcrqs; u64 buff_size; int i, rc; @@ -805,17 +826,27 @@ static int init_tx_pools(struct net_device *netdev) adapter->tso_pool = kcalloc(tx_subcrqs, sizeof(struct ibmvnic_tx_pool), GFP_KERNEL); + /* To simplify release_tx_pools() ensure that ->tx_pool and + * ->tso_pool are either both NULL or both non-NULL. + */ if (!adapter->tso_pool) { kfree(adapter->tx_pool); adapter->tx_pool = NULL; return -1; } + /* Set num_active_tx_pools early. If we fail below after partial + * allocation, release_tx_pools() will know how many to look for. + */ adapter->num_active_tx_pools = tx_subcrqs; for (i = 0; i < tx_subcrqs; i++) { buff_size = adapter->req_mtu + VLAN_HLEN; buff_size = ALIGN(buff_size, L1_CACHE_BYTES); + + dev_dbg(dev, "Init tx pool %d [%llu, %llu]\n", + i, adapter->req_tx_entries_per_subcrq, buff_size); + rc = init_one_tx_pool(netdev, &adapter->tx_pool[i], adapter->req_tx_entries_per_subcrq, buff_size); @@ -4774,9 +4805,10 @@ static void handle_query_map_rsp(union ibmvnic_crq *crq, dev_err(dev, "Error %ld in QUERY_MAP_RSP\n", rc); return; } - netdev_dbg(netdev, "page_size = %d\ntot_pages = %d\nfree_pages = %d\n", - crq->query_map_rsp.page_size, crq->query_map_rsp.tot_pages, - crq->query_map_rsp.free_pages); + netdev_dbg(netdev, "page_size = %d\ntot_pages = %u\nfree_pages = %u\n", + crq->query_map_rsp.page_size, + __be32_to_cpu(crq->query_map_rsp.tot_pages), + __be32_to_cpu(crq->query_map_rsp.free_pages)); } static void handle_query_cap_rsp(union ibmvnic_crq *crq, From patchwork Wed Sep 1 18:05:45 2021 Content-Type: text/plain; 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Wed, 1 Sep 2021 18:05:55 +0000 (GMT) From: Sukadev Bhattiprolu To: netdev@vger.kernel.org Cc: Brian King , cforno12@linux.ibm.com, Dany Madden , Rick Lindsley , Rick Lindsley Subject: [PATCH net-next v2 3/9] ibmvnic: Use/rename local vars in init_rx_pools Date: Wed, 1 Sep 2021 11:05:45 -0700 Message-Id: <20210901180551.150126-4-sukadev@linux.ibm.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210901180551.150126-1-sukadev@linux.ibm.com> References: <20210901180551.150126-1-sukadev@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: hre7hIjIbnUzoX1UhB9N1IK8J0_QmSxu X-Proofpoint-ORIG-GUID: hre7hIjIbnUzoX1UhB9N1IK8J0_QmSxu X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391,18.0.790 definitions=2021-09-01_05:2021-09-01,2021-09-01 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 suspectscore=0 clxscore=1015 priorityscore=1501 phishscore=0 spamscore=0 impostorscore=0 bulkscore=0 adultscore=0 mlxscore=0 lowpriorityscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2108310000 definitions=main-2109010104 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org To make the code more readable, use/rename some local variables. Basically we have a set of pools, num_pools. Each pool has a set of buffers, pool_size and each buffer is of size buff_size. pool_size is a bit ambiguous (whether size in bytes or buffers). Add a comment in the header file to make it explicit. Reviewed-by: Rick Lindsley Reviewed-by: Dany Madden Signed-off-by: Sukadev Bhattiprolu --- drivers/net/ethernet/ibm/ibmvnic.c | 17 +++++++++-------- drivers/net/ethernet/ibm/ibmvnic.h | 2 +- 2 files changed, 10 insertions(+), 9 deletions(-) diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c index cd04c3eb6c41..688489475791 100644 --- a/drivers/net/ethernet/ibm/ibmvnic.c +++ b/drivers/net/ethernet/ibm/ibmvnic.c @@ -620,14 +620,16 @@ static int init_rx_pools(struct net_device *netdev) struct ibmvnic_adapter *adapter = netdev_priv(netdev); struct device *dev = &adapter->vdev->dev; struct ibmvnic_rx_pool *rx_pool; - int rxadd_subcrqs; + u64 num_pools; + u64 pool_size; /* # of buffers in one pool */ u64 buff_size; int i, j; - rxadd_subcrqs = adapter->num_active_rx_scrqs; + num_pools = adapter->num_active_rx_scrqs; + pool_size = adapter->req_rx_add_entries_per_subcrq; buff_size = adapter->cur_rx_buf_sz; - adapter->rx_pool = kcalloc(rxadd_subcrqs, + adapter->rx_pool = kcalloc(num_pools, sizeof(struct ibmvnic_rx_pool), GFP_KERNEL); if (!adapter->rx_pool) { @@ -638,17 +640,16 @@ static int init_rx_pools(struct net_device *netdev) /* Set num_active_rx_pools early. If we fail below after partial * allocation, release_rx_pools() will know how many to look for. */ - adapter->num_active_rx_pools = rxadd_subcrqs; + adapter->num_active_rx_pools = num_pools; - for (i = 0; i < rxadd_subcrqs; i++) { + for (i = 0; i < num_pools; i++) { rx_pool = &adapter->rx_pool[i]; netdev_dbg(adapter->netdev, "Initializing rx_pool[%d], %lld buffs, %lld bytes each\n", - i, adapter->req_rx_add_entries_per_subcrq, - buff_size); + i, pool_size, buff_size); - rx_pool->size = adapter->req_rx_add_entries_per_subcrq; + rx_pool->size = pool_size; rx_pool->index = i; rx_pool->buff_size = ALIGN(buff_size, L1_CACHE_BYTES); rx_pool->active = 1; diff --git a/drivers/net/ethernet/ibm/ibmvnic.h b/drivers/net/ethernet/ibm/ibmvnic.h index 22df602323bc..5652566818fb 100644 --- a/drivers/net/ethernet/ibm/ibmvnic.h +++ b/drivers/net/ethernet/ibm/ibmvnic.h @@ -827,7 +827,7 @@ struct ibmvnic_rx_buff { struct ibmvnic_rx_pool { struct ibmvnic_rx_buff *rx_buff; - int size; + int size; /* # of buffers in the pool */ int index; int buff_size; atomic_t available; From patchwork Wed Sep 1 18:05:46 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sukadev Bhattiprolu X-Patchwork-Id: 12470069 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 X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 9B71CC432BE for ; Wed, 1 Sep 2021 18:06:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 814FA60F6F for ; Wed, 1 Sep 2021 18:06:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346526AbhIASHC (ORCPT ); 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Wed, 1 Sep 2021 18:05:57 +0000 (GMT) From: Sukadev Bhattiprolu To: netdev@vger.kernel.org Cc: Brian King , cforno12@linux.ibm.com, Dany Madden , Rick Lindsley , Rick Lindsley Subject: [PATCH net-next v2 4/9] ibmvnic: Use/rename local vars in init_tx_pools Date: Wed, 1 Sep 2021 11:05:46 -0700 Message-Id: <20210901180551.150126-5-sukadev@linux.ibm.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210901180551.150126-1-sukadev@linux.ibm.com> References: <20210901180551.150126-1-sukadev@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: ro-wVvob5930JfE3vKWgNGPKj9DgiuVn X-Proofpoint-ORIG-GUID: ro-wVvob5930JfE3vKWgNGPKj9DgiuVn X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391,18.0.790 definitions=2021-09-01_05:2021-09-01,2021-09-01 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 impostorscore=0 malwarescore=0 suspectscore=0 lowpriorityscore=0 mlxscore=0 adultscore=0 spamscore=0 mlxlogscore=999 bulkscore=0 priorityscore=1501 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2108310000 definitions=main-2109010104 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org Use/rename local variables in init_tx_pools() for consistency with init_rx_pools() and for readability. Also add some comments Reviewed-by: Rick Lindsley Reviewed-by: Dany Madden Signed-off-by: Sukadev Bhattiprolu --- drivers/net/ethernet/ibm/ibmvnic.c | 30 ++++++++++++++++-------------- 1 file changed, 16 insertions(+), 14 deletions(-) diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c index 688489475791..97041b319beb 100644 --- a/drivers/net/ethernet/ibm/ibmvnic.c +++ b/drivers/net/ethernet/ibm/ibmvnic.c @@ -781,31 +781,31 @@ static void release_tx_pools(struct ibmvnic_adapter *adapter) static int init_one_tx_pool(struct net_device *netdev, struct ibmvnic_tx_pool *tx_pool, - int num_entries, int buf_size) + int pool_size, int buf_size) { struct ibmvnic_adapter *adapter = netdev_priv(netdev); int i; - tx_pool->tx_buff = kcalloc(num_entries, + tx_pool->tx_buff = kcalloc(pool_size, sizeof(struct ibmvnic_tx_buff), GFP_KERNEL); if (!tx_pool->tx_buff) return -1; if (alloc_long_term_buff(adapter, &tx_pool->long_term_buff, - num_entries * buf_size)) + pool_size * buf_size)) return -1; - tx_pool->free_map = kcalloc(num_entries, sizeof(int), GFP_KERNEL); + tx_pool->free_map = kcalloc(pool_size, sizeof(int), GFP_KERNEL); if (!tx_pool->free_map) return -1; - for (i = 0; i < num_entries; i++) + for (i = 0; i < pool_size; i++) tx_pool->free_map[i] = i; tx_pool->consumer_index = 0; tx_pool->producer_index = 0; - tx_pool->num_buffers = num_entries; + tx_pool->num_buffers = pool_size; tx_pool->buf_size = buf_size; return 0; @@ -815,17 +815,20 @@ static int init_tx_pools(struct net_device *netdev) { struct ibmvnic_adapter *adapter = netdev_priv(netdev); struct device *dev = &adapter->vdev->dev; - int tx_subcrqs; + int num_pools; + u64 pool_size; /* # of buffers in pool */ u64 buff_size; int i, rc; - tx_subcrqs = adapter->num_active_tx_scrqs; - adapter->tx_pool = kcalloc(tx_subcrqs, + pool_size = adapter->req_tx_entries_per_subcrq; + num_pools = adapter->num_active_tx_scrqs; + + adapter->tx_pool = kcalloc(num_pools, sizeof(struct ibmvnic_tx_pool), GFP_KERNEL); if (!adapter->tx_pool) return -1; - adapter->tso_pool = kcalloc(tx_subcrqs, + adapter->tso_pool = kcalloc(num_pools, sizeof(struct ibmvnic_tx_pool), GFP_KERNEL); /* To simplify release_tx_pools() ensure that ->tx_pool and * ->tso_pool are either both NULL or both non-NULL. @@ -839,9 +842,9 @@ static int init_tx_pools(struct net_device *netdev) /* Set num_active_tx_pools early. If we fail below after partial * allocation, release_tx_pools() will know how many to look for. */ - adapter->num_active_tx_pools = tx_subcrqs; + adapter->num_active_tx_pools = num_pools; - for (i = 0; i < tx_subcrqs; i++) { + for (i = 0; i < num_pools; i++) { buff_size = adapter->req_mtu + VLAN_HLEN; buff_size = ALIGN(buff_size, L1_CACHE_BYTES); @@ -849,8 +852,7 @@ static int init_tx_pools(struct net_device *netdev) i, adapter->req_tx_entries_per_subcrq, buff_size); rc = init_one_tx_pool(netdev, &adapter->tx_pool[i], - adapter->req_tx_entries_per_subcrq, - buff_size); + pool_size, buff_size); if (rc) { release_tx_pools(adapter); return rc; From patchwork Wed Sep 1 18:05:47 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sukadev Bhattiprolu X-Patchwork-Id: 12470071 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 X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 08ECDC432BE for ; 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Wed, 1 Sep 2021 18:05:58 +0000 (GMT) From: Sukadev Bhattiprolu To: netdev@vger.kernel.org Cc: Brian King , cforno12@linux.ibm.com, Dany Madden , Rick Lindsley , Rick Lindsley Subject: [PATCH net-next v2 5/9] ibmvnic: init_tx_pools move loop-invariant code Date: Wed, 1 Sep 2021 11:05:47 -0700 Message-Id: <20210901180551.150126-6-sukadev@linux.ibm.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210901180551.150126-1-sukadev@linux.ibm.com> References: <20210901180551.150126-1-sukadev@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: 1voxR6bbwFzm-dBb1vt_LIRfOuORkNyA X-Proofpoint-GUID: 1voxR6bbwFzm-dBb1vt_LIRfOuORkNyA X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391,18.0.790 definitions=2021-09-01_05:2021-09-01,2021-09-01 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 phishscore=0 mlxlogscore=999 priorityscore=1501 impostorscore=0 adultscore=0 suspectscore=0 mlxscore=0 bulkscore=0 malwarescore=0 lowpriorityscore=0 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2108310000 definitions=main-2109010104 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org In init_tx_pools() move some loop-invariant code out of the loop. Reviewed-by: Rick Lindsley Reviewed-by: Dany Madden Signed-off-by: Sukadev Bhattiprolu --- drivers/net/ethernet/ibm/ibmvnic.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c index 97041b319beb..bb9b8aec9c9b 100644 --- a/drivers/net/ethernet/ibm/ibmvnic.c +++ b/drivers/net/ethernet/ibm/ibmvnic.c @@ -843,11 +843,10 @@ static int init_tx_pools(struct net_device *netdev) * allocation, release_tx_pools() will know how many to look for. */ adapter->num_active_tx_pools = num_pools; + buff_size = adapter->req_mtu + VLAN_HLEN; + buff_size = ALIGN(buff_size, L1_CACHE_BYTES); for (i = 0; i < num_pools; i++) { - buff_size = adapter->req_mtu + VLAN_HLEN; - buff_size = ALIGN(buff_size, L1_CACHE_BYTES); - dev_dbg(dev, "Init tx pool %d [%llu, %llu]\n", i, adapter->req_tx_entries_per_subcrq, buff_size); From patchwork Wed Sep 1 18:05:48 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sukadev Bhattiprolu X-Patchwork-Id: 12470073 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 X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 26830C432BE for ; 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Wed, 1 Sep 2021 18:06:00 +0000 (GMT) From: Sukadev Bhattiprolu To: netdev@vger.kernel.org Cc: Brian King , cforno12@linux.ibm.com, Dany Madden , Rick Lindsley , Rick Lindsley Subject: [PATCH net-next v2 6/9] ibmvnic: Use bitmap for LTB map_ids Date: Wed, 1 Sep 2021 11:05:48 -0700 Message-Id: <20210901180551.150126-7-sukadev@linux.ibm.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210901180551.150126-1-sukadev@linux.ibm.com> References: <20210901180551.150126-1-sukadev@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: DeC8MJtlYTnBJ3_dIuD09ZcMuJZcDXan X-Proofpoint-ORIG-GUID: DeC8MJtlYTnBJ3_dIuD09ZcMuJZcDXan X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391,18.0.790 definitions=2021-09-01_05:2021-09-01,2021-09-01 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 impostorscore=0 malwarescore=0 suspectscore=0 lowpriorityscore=0 mlxscore=0 adultscore=0 spamscore=0 mlxlogscore=999 bulkscore=0 priorityscore=1501 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2108310000 definitions=main-2109010104 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org In a follow-on patch, we will reuse long term buffers when possible. When doing so we have to be careful to properly assign map ids. We can no longer assign them sequentially because a lower map id may be available and we could wrap at 255 and collide with an in-use map id. Instead, use a bitmap to track active map ids and to find a free map id. Don't need to take locks here since the map_id only changes during reset and at that time only the reset worker thread should be using the adapter. Noticed this when analyzing an error Dany Madden ran into with the patch set. Reported-by: Dany Madden Reviewed-by: Rick Lindsley Reviewed-by: Dany Madden Signed-off-by: Sukadev Bhattiprolu --- drivers/net/ethernet/ibm/ibmvnic.c | 12 ++++++++---- drivers/net/ethernet/ibm/ibmvnic.h | 3 ++- 2 files changed, 10 insertions(+), 5 deletions(-) diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c index bb9b8aec9c9b..4603597a9c10 100644 --- a/drivers/net/ethernet/ibm/ibmvnic.c +++ b/drivers/net/ethernet/ibm/ibmvnic.c @@ -228,8 +228,9 @@ static int alloc_long_term_buff(struct ibmvnic_adapter *adapter, dev_err(dev, "Couldn't alloc long term buffer\n"); return -ENOMEM; } - ltb->map_id = adapter->map_id; - adapter->map_id++; + ltb->map_id = find_first_zero_bit(adapter->map_ids, + MAX_MAP_ID); + bitmap_set(adapter->map_ids, ltb->map_id, 1); mutex_lock(&adapter->fw_lock); adapter->fw_done_rc = 0; @@ -284,6 +285,8 @@ static void free_long_term_buff(struct ibmvnic_adapter *adapter, dma_free_coherent(dev, ltb->size, ltb->buff, ltb->addr); ltb->buff = NULL; + /* mark this map_id free */ + bitmap_clear(adapter->map_ids, ltb->map_id, 1); ltb->map_id = 0; } @@ -1235,8 +1238,6 @@ static int init_resources(struct ibmvnic_adapter *adapter) return rc; } - adapter->map_id = 1; - rc = init_napi(adapter); if (rc) return rc; @@ -5557,6 +5558,9 @@ static int ibmvnic_probe(struct vio_dev *dev, const struct vio_device_id *id) adapter->vdev = dev; adapter->netdev = netdev; adapter->login_pending = false; + memset(&adapter->map_ids, 0, sizeof(adapter->map_ids)); + /* map_ids start at 1, so ensure map_id 0 is always "in-use" */ + bitmap_set(adapter->map_ids, 0, 1); ether_addr_copy(adapter->mac_addr, mac_addr_p); ether_addr_copy(netdev->dev_addr, adapter->mac_addr); diff --git a/drivers/net/ethernet/ibm/ibmvnic.h b/drivers/net/ethernet/ibm/ibmvnic.h index 5652566818fb..e97f1aa98c05 100644 --- a/drivers/net/ethernet/ibm/ibmvnic.h +++ b/drivers/net/ethernet/ibm/ibmvnic.h @@ -979,7 +979,8 @@ struct ibmvnic_adapter { u64 opt_tx_entries_per_subcrq; u64 opt_rxba_entries_per_subcrq; __be64 tx_rx_desc_req; - u8 map_id; +#define MAX_MAP_ID 255 + DECLARE_BITMAP(map_ids, MAX_MAP_ID); u32 num_active_rx_scrqs; u32 num_active_rx_pools; u32 num_active_rx_napi; From patchwork Wed Sep 1 18:05:49 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sukadev Bhattiprolu X-Patchwork-Id: 12470075 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 X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 7758DC4320E for ; Wed, 1 Sep 2021 18:06:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 575CC61075 for ; 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Wed, 1 Sep 2021 18:06:01 +0000 (GMT) From: Sukadev Bhattiprolu To: netdev@vger.kernel.org Cc: Brian King , cforno12@linux.ibm.com, Dany Madden , Rick Lindsley , Rick Lindsley Subject: [PATCH net-next v2 7/9] ibmvnic: Reuse LTB when possible Date: Wed, 1 Sep 2021 11:05:49 -0700 Message-Id: <20210901180551.150126-8-sukadev@linux.ibm.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210901180551.150126-1-sukadev@linux.ibm.com> References: <20210901180551.150126-1-sukadev@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: 2HzeDyX7tZ5qv1RoGjk0lrkoTASwLNdT X-Proofpoint-ORIG-GUID: 2HzeDyX7tZ5qv1RoGjk0lrkoTASwLNdT X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391,18.0.790 definitions=2021-09-01_05:2021-09-01,2021-09-01 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 adultscore=0 phishscore=0 lowpriorityscore=0 mlxlogscore=999 malwarescore=0 suspectscore=0 clxscore=1015 impostorscore=0 bulkscore=0 spamscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2108310000 definitions=main-2109010104 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org Reuse the long term buffer during a reset as long as its size has not changed. If the size has changed, free it and allocate a new one of the appropriate size. When we do this, alloc_long_term_buff() and reset_long_term_buff() become identical. Drop reset_long_term_buff(). Reviewed-by: Rick Lindsley Reviewed-by: Dany Madden Signed-off-by: Sukadev Bhattiprolu --- Changelog[v2]: [Jakub Kicinski] Fix kdoc issues --- drivers/net/ethernet/ibm/ibmvnic.c | 137 ++++++++++++++++------------- 1 file changed, 74 insertions(+), 63 deletions(-) diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c index 4603597a9c10..dafb36690fdc 100644 --- a/drivers/net/ethernet/ibm/ibmvnic.c +++ b/drivers/net/ethernet/ibm/ibmvnic.c @@ -108,6 +108,8 @@ static int init_crq_queue(struct ibmvnic_adapter *adapter); static int send_query_phys_parms(struct ibmvnic_adapter *adapter); static void ibmvnic_tx_scrq_clean_buffer(struct ibmvnic_adapter *adapter, struct ibmvnic_sub_crq_queue *tx_scrq); +static void free_long_term_buff(struct ibmvnic_adapter *adapter, + struct ibmvnic_long_term_buff *ltb); struct ibmvnic_stat { char name[ETH_GSTRING_LEN]; @@ -214,23 +216,77 @@ static int ibmvnic_wait_for_completion(struct ibmvnic_adapter *adapter, return -ETIMEDOUT; } +/** + * reuse_ltb() - Check if a long term buffer can be reused + * @ltb: The long term buffer to be checked + * @size: The size of the long term buffer. + * + * An LTB can be reused unless its size has changed. + * + * Return: Return true if the LTB can be reused, false otherwise. + */ +static bool reuse_ltb(struct ibmvnic_long_term_buff *ltb, int size) +{ + return (ltb->buff && ltb->size == size); +} + +/** + * alloc_long_term_buff() - Allocate a long term buffer (LTB) + * + * @adapter: ibmvnic adapter associated to the LTB + * @ltb: container object for the LTB + * @size: size of the LTB + * + * Allocate an LTB of the specified size and notify VIOS. + * + * If the given @ltb already has the correct size, reuse it. Otherwise if + * its non-NULL, free it. Then allocate a new one of the correct size. + * Notify the VIOS either way since we may now be working with a new VIOS. + * + * Allocating larger chunks of memory during resets, specially LPM or under + * low memory situations can cause resets to fail/timeout and for LPAR to + * lose connectivity. So hold onto the LTB even if we fail to communicate + * with the VIOS and reuse it on next open. Free LTB when adapter is closed. + * + * Return: 0 if we were able to allocate the LTB and notify the VIOS and + * a negative value otherwise. + */ static int alloc_long_term_buff(struct ibmvnic_adapter *adapter, struct ibmvnic_long_term_buff *ltb, int size) { struct device *dev = &adapter->vdev->dev; int rc; - ltb->size = size; - ltb->buff = dma_alloc_coherent(dev, ltb->size, <b->addr, - GFP_KERNEL); + if (!reuse_ltb(ltb, size)) { + dev_dbg(dev, + "LTB size changed from 0x%llx to 0x%x, reallocating\n", + ltb->size, size); + free_long_term_buff(adapter, ltb); + } - if (!ltb->buff) { - dev_err(dev, "Couldn't alloc long term buffer\n"); - return -ENOMEM; + if (ltb->buff) { + dev_dbg(dev, "Reusing LTB [map %d, size 0x%llx]\n", + ltb->map_id, ltb->size); + } else { + ltb->buff = dma_alloc_coherent(dev, size, <b->addr, + GFP_KERNEL); + if (!ltb->buff) { + dev_err(dev, "Couldn't alloc long term buffer\n"); + return -ENOMEM; + } + ltb->size = size; + + ltb->map_id = find_first_zero_bit(adapter->map_ids, + MAX_MAP_ID); + bitmap_set(adapter->map_ids, ltb->map_id, 1); + + dev_dbg(dev, + "Allocated new LTB [map %d, size 0x%llx]\n", + ltb->map_id, ltb->size); } - ltb->map_id = find_first_zero_bit(adapter->map_ids, - MAX_MAP_ID); - bitmap_set(adapter->map_ids, ltb->map_id, 1); + + /* Ensure ltb is zeroed - specially when reusing it. */ + memset(ltb->buff, 0, ltb->size); mutex_lock(&adapter->fw_lock); adapter->fw_done_rc = 0; @@ -257,10 +313,7 @@ static int alloc_long_term_buff(struct ibmvnic_adapter *adapter, } rc = 0; out: - if (rc) { - dma_free_coherent(dev, ltb->size, ltb->buff, ltb->addr); - ltb->buff = NULL; - } + /* don't free LTB on communication error - see function header */ mutex_unlock(&adapter->fw_lock); return rc; } @@ -290,43 +343,6 @@ static void free_long_term_buff(struct ibmvnic_adapter *adapter, ltb->map_id = 0; } -static int reset_long_term_buff(struct ibmvnic_adapter *adapter, - struct ibmvnic_long_term_buff *ltb) -{ - struct device *dev = &adapter->vdev->dev; - int rc; - - memset(ltb->buff, 0, ltb->size); - - mutex_lock(&adapter->fw_lock); - adapter->fw_done_rc = 0; - - reinit_completion(&adapter->fw_done); - rc = send_request_map(adapter, ltb->addr, ltb->size, ltb->map_id); - if (rc) { - mutex_unlock(&adapter->fw_lock); - return rc; - } - - rc = ibmvnic_wait_for_completion(adapter, &adapter->fw_done, 10000); - if (rc) { - dev_info(dev, - "Reset failed, long term map request timed out or aborted\n"); - mutex_unlock(&adapter->fw_lock); - return rc; - } - - if (adapter->fw_done_rc) { - dev_info(dev, - "Reset failed, attempting to free and reallocate buffer\n"); - free_long_term_buff(adapter, ltb); - mutex_unlock(&adapter->fw_lock); - return alloc_long_term_buff(adapter, ltb, ltb->size); - } - mutex_unlock(&adapter->fw_lock); - return 0; -} - static void deactivate_rx_pools(struct ibmvnic_adapter *adapter) { int i; @@ -548,18 +564,10 @@ static int reset_rx_pools(struct ibmvnic_adapter *adapter) netdev_dbg(adapter->netdev, "Re-setting rx_pool[%d]\n", i); - if (rx_pool->buff_size != buff_size) { - free_long_term_buff(adapter, &rx_pool->long_term_buff); - rx_pool->buff_size = ALIGN(buff_size, L1_CACHE_BYTES); - rc = alloc_long_term_buff(adapter, - &rx_pool->long_term_buff, - rx_pool->size * - rx_pool->buff_size); - } else { - rc = reset_long_term_buff(adapter, - &rx_pool->long_term_buff); - } - + rx_pool->buff_size = ALIGN(buff_size, L1_CACHE_BYTES); + rc = alloc_long_term_buff(adapter, + &rx_pool->long_term_buff, + rx_pool->size * rx_pool->buff_size); if (rc) return rc; @@ -694,9 +702,12 @@ static int init_rx_pools(struct net_device *netdev) static int reset_one_tx_pool(struct ibmvnic_adapter *adapter, struct ibmvnic_tx_pool *tx_pool) { + struct ibmvnic_long_term_buff *ltb; int rc, i; - rc = reset_long_term_buff(adapter, &tx_pool->long_term_buff); + ltb = &tx_pool->long_term_buff; + + rc = alloc_long_term_buff(adapter, ltb, ltb->size); if (rc) return rc; From patchwork Wed Sep 1 18:05:50 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sukadev Bhattiprolu X-Patchwork-Id: 12470077 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 X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 C385CC432BE for ; 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Wed, 1 Sep 2021 18:06:03 +0000 (GMT) From: Sukadev Bhattiprolu To: netdev@vger.kernel.org Cc: Brian King , cforno12@linux.ibm.com, Dany Madden , Rick Lindsley , Rick Lindsley Subject: [PATCH net-next v2 8/9] ibmvnic: Reuse rx pools when possible Date: Wed, 1 Sep 2021 11:05:50 -0700 Message-Id: <20210901180551.150126-9-sukadev@linux.ibm.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210901180551.150126-1-sukadev@linux.ibm.com> References: <20210901180551.150126-1-sukadev@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: rzqricE1hqRwPdgP8_NfQMVEk676mYz_ X-Proofpoint-ORIG-GUID: rzqricE1hqRwPdgP8_NfQMVEk676mYz_ X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391,18.0.790 definitions=2021-09-01_05:2021-09-01,2021-09-01 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 adultscore=0 phishscore=0 lowpriorityscore=0 mlxlogscore=999 malwarescore=0 suspectscore=0 clxscore=1015 impostorscore=0 bulkscore=0 spamscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2108310000 definitions=main-2109010104 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org Rather than releasing the rx pools on and reallocating them on every reset, reuse the rx pools unless the pool parameters (number of pools, size of each pool or size of each buffer in a pool) have changed. If the pool parameters changed, then release the old pools (if any) and allocate new ones. Specifically release rx pools, if: - adapter is removed, - pool parameters change during reset, - we encounter an error when opening the adapter in response to a user request (in ibmvnic_open()). and don't release them: - in __ibmvnic_close() or - on errors in __ibmvnic_open() in the hope that we can reuse them on the next reset. With these, reset_rx_pools() can be dropped because its optimzation is now included in init_rx_pools() itself. cleanup_rx_pools() releases all the skbs associated with the pool and is called from ibmvnic_cleanup(), which is called on every reset. Since we want to reuse skbs across resets, move cleanup_rx_pools() out of ibmvnic_cleanup() and call it only when user closes the adapter. Add two new adapter fields, ->prev_rx_buf_sz, ->prev_rx_pool_size to keep track of the previous values and use them to decide whether to reuse or realloc the pools. Reviewed-by: Rick Lindsley Reviewed-by: Dany Madden Signed-off-by: Sukadev Bhattiprolu --- Changelog[v2]: [Jakub Kicinski] Fix kdoc issues --- drivers/net/ethernet/ibm/ibmvnic.c | 198 +++++++++++++++++++---------- drivers/net/ethernet/ibm/ibmvnic.h | 3 + 2 files changed, 137 insertions(+), 64 deletions(-) diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c index dafb36690fdc..05aabb0effef 100644 --- a/drivers/net/ethernet/ibm/ibmvnic.c +++ b/drivers/net/ethernet/ibm/ibmvnic.c @@ -383,20 +383,27 @@ static void replenish_rx_pool(struct ibmvnic_adapter *adapter, * be 0. */ for (i = ind_bufp->index; i < count; ++i) { - skb = netdev_alloc_skb(adapter->netdev, pool->buff_size); + index = pool->free_map[pool->next_free]; + + /* We maybe reusing the skb from earlier resets. Allocate + * only if necessary. But since the LTB may have changed + * during reset (see init_rx_pools()), update LTB below + * even if reusing skb. + */ + skb = pool->rx_buff[index].skb; if (!skb) { - dev_err(dev, "Couldn't replenish rx buff\n"); - adapter->replenish_no_mem++; - break; + skb = netdev_alloc_skb(adapter->netdev, + pool->buff_size); + if (!skb) { + dev_err(dev, "Couldn't replenish rx buff\n"); + adapter->replenish_no_mem++; + break; + } } - index = pool->free_map[pool->next_free]; pool->free_map[pool->next_free] = IBMVNIC_INVALID_MAP; pool->next_free = (pool->next_free + 1) % pool->size; - if (pool->rx_buff[index].skb) - dev_err(dev, "Inconsistent free_map!\n"); - /* Copy the skb to the long term mapped DMA buffer */ offset = index * pool->buff_size; dst = pool->long_term_buff.buff + offset; @@ -547,45 +554,6 @@ static int init_stats_token(struct ibmvnic_adapter *adapter) return 0; } -static int reset_rx_pools(struct ibmvnic_adapter *adapter) -{ - struct ibmvnic_rx_pool *rx_pool; - u64 buff_size; - int rx_scrqs; - int i, j, rc; - - if (!adapter->rx_pool) - return -1; - - buff_size = adapter->cur_rx_buf_sz; - rx_scrqs = adapter->num_active_rx_pools; - for (i = 0; i < rx_scrqs; i++) { - rx_pool = &adapter->rx_pool[i]; - - netdev_dbg(adapter->netdev, "Re-setting rx_pool[%d]\n", i); - - rx_pool->buff_size = ALIGN(buff_size, L1_CACHE_BYTES); - rc = alloc_long_term_buff(adapter, - &rx_pool->long_term_buff, - rx_pool->size * rx_pool->buff_size); - if (rc) - return rc; - - for (j = 0; j < rx_pool->size; j++) - rx_pool->free_map[j] = j; - - memset(rx_pool->rx_buff, 0, - rx_pool->size * sizeof(struct ibmvnic_rx_buff)); - - atomic_set(&rx_pool->available, 0); - rx_pool->next_alloc = 0; - rx_pool->next_free = 0; - rx_pool->active = 1; - } - - return 0; -} - /** * release_rx_pools() - Release any rx pools attached to @adapter. * @adapter: ibmvnic adapter @@ -606,6 +574,7 @@ static void release_rx_pools(struct ibmvnic_adapter *adapter) netdev_dbg(adapter->netdev, "Releasing rx_pool[%d]\n", i); kfree(rx_pool->free_map); + free_long_term_buff(adapter, &rx_pool->long_term_buff); if (!rx_pool->rx_buff) @@ -624,8 +593,68 @@ static void release_rx_pools(struct ibmvnic_adapter *adapter) kfree(adapter->rx_pool); adapter->rx_pool = NULL; adapter->num_active_rx_pools = 0; + adapter->prev_rx_pool_size = 0; +} + +/** + * reuse_rx_pools() - Check if the existing rx pools can be reused. + * @adapter: ibmvnic adapter + * + * Check if the existing rx pools in the adapter can be reused. The + * pools can be reused if the pool parameters (number of pools, + * number of buffers in the pool and size of each buffer) have not + * changed. + * + * NOTE: This assumes that all pools have the same number of buffers + * which is the case currently. If that changes, we must fix this. + * + * Return: true if the rx pools can be reused, false otherwise. + */ +static bool reuse_rx_pools(struct ibmvnic_adapter *adapter) +{ + u64 old_num_pools, new_num_pools; + u64 old_pool_size, new_pool_size; + u64 old_buff_size, new_buff_size; + + if (!adapter->rx_pool) + return false; + + old_num_pools = adapter->num_active_rx_pools; + new_num_pools = adapter->req_rx_queues; + + old_pool_size = adapter->prev_rx_pool_size; + new_pool_size = adapter->req_rx_add_entries_per_subcrq; + + old_buff_size = adapter->prev_rx_buf_sz; + new_buff_size = adapter->cur_rx_buf_sz; + + /* Require buff size to be exactly same for now */ + if (old_buff_size != new_buff_size) + return false; + + if (old_num_pools == new_num_pools && old_pool_size == new_pool_size) + return true; + + if (old_num_pools < adapter->min_rx_queues || + old_num_pools > adapter->max_rx_queues || + old_pool_size < adapter->min_rx_add_entries_per_subcrq || + old_pool_size > adapter->max_rx_add_entries_per_subcrq) + return false; + + return true; } +/** + * init_rx_pools(): Initialize the set of receiver pools in the adapter. + * @netdev: net device associated with the vnic interface + * + * Initialize the set of receiver pools in the ibmvnic adapter associated + * with the net_device @netdev. If possible, reuse the existing rx pools. + * Otherwise free any existing pools and allocate a new set of pools + * before initializing them. + * + * Return: 0 on success and negative value on error. + */ static int init_rx_pools(struct net_device *netdev) { struct ibmvnic_adapter *adapter = netdev_priv(netdev); @@ -636,10 +665,18 @@ static int init_rx_pools(struct net_device *netdev) u64 buff_size; int i, j; - num_pools = adapter->num_active_rx_scrqs; pool_size = adapter->req_rx_add_entries_per_subcrq; + num_pools = adapter->req_rx_queues; buff_size = adapter->cur_rx_buf_sz; + if (reuse_rx_pools(adapter)) { + dev_dbg(dev, "Reusing rx pools\n"); + goto update_ltb; + } + + /* Allocate/populate the pools. */ + release_rx_pools(adapter); + adapter->rx_pool = kcalloc(num_pools, sizeof(struct ibmvnic_rx_pool), GFP_KERNEL); @@ -663,14 +700,12 @@ static int init_rx_pools(struct net_device *netdev) rx_pool->size = pool_size; rx_pool->index = i; rx_pool->buff_size = ALIGN(buff_size, L1_CACHE_BYTES); - rx_pool->active = 1; rx_pool->free_map = kcalloc(rx_pool->size, sizeof(int), GFP_KERNEL); if (!rx_pool->free_map) { dev_err(dev, "Couldn't alloc free_map %d\n", i); - release_rx_pools(adapter); - return -1; + goto out_release; } rx_pool->rx_buff = kcalloc(rx_pool->size, @@ -678,25 +713,58 @@ static int init_rx_pools(struct net_device *netdev) GFP_KERNEL); if (!rx_pool->rx_buff) { dev_err(dev, "Couldn't alloc rx buffers\n"); - release_rx_pools(adapter); - return -1; + goto out_release; } + } + + adapter->prev_rx_pool_size = pool_size; + adapter->prev_rx_buf_sz = adapter->cur_rx_buf_sz; + +update_ltb: + for (i = 0; i < num_pools; i++) { + rx_pool = &adapter->rx_pool[i]; + dev_dbg(dev, "Updating LTB for rx pool %d [%d, %d]\n", + i, rx_pool->size, rx_pool->buff_size); if (alloc_long_term_buff(adapter, &rx_pool->long_term_buff, - rx_pool->size * rx_pool->buff_size)) { - release_rx_pools(adapter); - return -1; - } + rx_pool->size * rx_pool->buff_size)) + goto out; + + for (j = 0; j < rx_pool->size; ++j) { + struct ibmvnic_rx_buff *rx_buff; - for (j = 0; j < rx_pool->size; ++j) rx_pool->free_map[j] = j; + /* NOTE: Don't clear rx_buff->skb here - will leak + * memory! replenish_rx_pool() will reuse skbs or + * allocate as necessary. + */ + rx_buff = &rx_pool->rx_buff[j]; + rx_buff->dma = 0; + rx_buff->data = 0; + rx_buff->size = 0; + rx_buff->pool_index = 0; + } + + /* Mark pool "empty" so replenish_rx_pools() will + * update the LTB info for each buffer + */ atomic_set(&rx_pool->available, 0); rx_pool->next_alloc = 0; rx_pool->next_free = 0; + /* replenish_rx_pool() may have called deactivate_rx_pools() + * on failover. Ensure pool is active now. + */ + rx_pool->active = 1; } - return 0; +out_release: + release_rx_pools(adapter); +out: + /* We failed to allocate one or more LTBs or map them on the VIOS. + * Hold onto the pools and any LTBs that we did allocate/map. + */ + return -1; } static int reset_one_tx_pool(struct ibmvnic_adapter *adapter, @@ -1072,7 +1140,6 @@ static void release_resources(struct ibmvnic_adapter *adapter) release_vpd_data(adapter); release_tx_pools(adapter); - release_rx_pools(adapter); release_napi(adapter); release_login_buffer(adapter); @@ -1345,6 +1412,7 @@ static int ibmvnic_open(struct net_device *netdev) if (rc) { netdev_err(netdev, "failed to initialize resources\n"); release_resources(adapter); + release_rx_pools(adapter); goto out; } } @@ -1474,7 +1542,6 @@ static void ibmvnic_cleanup(struct net_device *netdev) ibmvnic_napi_disable(adapter); ibmvnic_disable_irqs(adapter); - clean_rx_pools(adapter); clean_tx_pools(adapter); } @@ -1509,6 +1576,7 @@ static int ibmvnic_close(struct net_device *netdev) rc = __ibmvnic_close(netdev); ibmvnic_cleanup(netdev); + clean_rx_pools(adapter); return rc; } @@ -2237,7 +2305,6 @@ static int do_reset(struct ibmvnic_adapter *adapter, !adapter->rx_pool || !adapter->tso_pool || !adapter->tx_pool) { - release_rx_pools(adapter); release_tx_pools(adapter); release_napi(adapter); release_vpd_data(adapter); @@ -2254,9 +2321,10 @@ static int do_reset(struct ibmvnic_adapter *adapter, goto out; } - rc = reset_rx_pools(adapter); + rc = init_rx_pools(netdev); if (rc) { - netdev_dbg(adapter->netdev, "reset rx pools failed (%d)\n", + netdev_dbg(netdev, + "init rx pools failed (%d)\n", rc); goto out; } @@ -5592,6 +5660,7 @@ static int ibmvnic_probe(struct vio_dev *dev, const struct vio_device_id *id) init_completion(&adapter->reset_done); init_completion(&adapter->stats_done); clear_bit(0, &adapter->resetting); + adapter->prev_rx_buf_sz = 0; init_success = false; do { @@ -5692,6 +5761,7 @@ static void ibmvnic_remove(struct vio_dev *dev) unregister_netdevice(netdev); release_resources(adapter); + release_rx_pools(adapter); release_sub_crqs(adapter, 1); release_crq_queue(adapter); diff --git a/drivers/net/ethernet/ibm/ibmvnic.h b/drivers/net/ethernet/ibm/ibmvnic.h index e97f1aa98c05..b73a1b812368 100644 --- a/drivers/net/ethernet/ibm/ibmvnic.h +++ b/drivers/net/ethernet/ibm/ibmvnic.h @@ -986,7 +986,10 @@ struct ibmvnic_adapter { u32 num_active_rx_napi; u32 num_active_tx_scrqs; u32 num_active_tx_pools; + + u32 prev_rx_pool_size; u32 cur_rx_buf_sz; + u32 prev_rx_buf_sz; struct tasklet_struct tasklet; enum vnic_state state; From patchwork Wed Sep 1 18:05:51 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sukadev Bhattiprolu X-Patchwork-Id: 12470079 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 X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 AFB03C4320A for ; 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Wed, 1 Sep 2021 18:06:04 +0000 (GMT) From: Sukadev Bhattiprolu To: netdev@vger.kernel.org Cc: Brian King , cforno12@linux.ibm.com, Dany Madden , Rick Lindsley , Rick Lindsley Subject: [PATCH net-next v2 9/9] ibmvnic: Reuse tx pools when possible Date: Wed, 1 Sep 2021 11:05:51 -0700 Message-Id: <20210901180551.150126-10-sukadev@linux.ibm.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210901180551.150126-1-sukadev@linux.ibm.com> References: <20210901180551.150126-1-sukadev@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: CcfARlvtfLUHHMN1blYqCuW9rENHPBA0 X-Proofpoint-ORIG-GUID: CcfARlvtfLUHHMN1blYqCuW9rENHPBA0 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391,18.0.790 definitions=2021-09-01_05:2021-09-01,2021-09-01 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 impostorscore=0 malwarescore=0 suspectscore=0 lowpriorityscore=0 mlxscore=0 adultscore=0 spamscore=0 mlxlogscore=999 bulkscore=0 priorityscore=1501 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2108310000 definitions=main-2109010104 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org Rather than releasing the tx pools on every close and reallocating them on open, reuse the tx pools unless the pool parameters (number of pools, size of each pool or size of each buffer in a pool) have changed. If the pool parameters changed, then release the old pools (if any) and allocate new ones. Specifically release tx pools, if: - adapter is removed, - pool parameters change during reset, - we encounter an error when opening the adapter in response to a user request (in ibmvnic_open()). and don't release them: - in __ibmvnic_close() or - on errors in __ibmvnic_open() in the hope that we can reuse them during this or next reset. With these changes reset_tx_pools() can be dropped because its optimization is now included in init_tx_pools() itself. cleanup_tx_pools() releases all the skbs associated with the pool and is called from ibmvnic_cleanup(), which is called on every reset. Since we want to reuse skbs across resets, move cleanup_tx_pools() out of ibmvnic_cleanup() and call it only when user closes the adapter. Add two new adapter fields, ->prev_mtu, ->prev_tx_pool_size to track the previous values and use them to decide whether to reuse or realloc the pools. Reviewed-by: Rick Lindsley Reviewed-by: Dany Madden Signed-off-by: Sukadev Bhattiprolu --- Changelog[v2]: [Jakub Kicinski] Fix kdoc issues --- drivers/net/ethernet/ibm/ibmvnic.c | 215 +++++++++++++++++++---------- drivers/net/ethernet/ibm/ibmvnic.h | 2 + 2 files changed, 147 insertions(+), 70 deletions(-) diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c index 05aabb0effef..d1be883f933a 100644 --- a/drivers/net/ethernet/ibm/ibmvnic.c +++ b/drivers/net/ethernet/ibm/ibmvnic.c @@ -767,53 +767,6 @@ static int init_rx_pools(struct net_device *netdev) return -1; } -static int reset_one_tx_pool(struct ibmvnic_adapter *adapter, - struct ibmvnic_tx_pool *tx_pool) -{ - struct ibmvnic_long_term_buff *ltb; - int rc, i; - - ltb = &tx_pool->long_term_buff; - - rc = alloc_long_term_buff(adapter, ltb, ltb->size); - if (rc) - return rc; - - memset(tx_pool->tx_buff, 0, - tx_pool->num_buffers * - sizeof(struct ibmvnic_tx_buff)); - - for (i = 0; i < tx_pool->num_buffers; i++) - tx_pool->free_map[i] = i; - - tx_pool->consumer_index = 0; - tx_pool->producer_index = 0; - - return 0; -} - -static int reset_tx_pools(struct ibmvnic_adapter *adapter) -{ - int tx_scrqs; - int i, rc; - - if (!adapter->tx_pool) - return -1; - - tx_scrqs = adapter->num_active_tx_pools; - for (i = 0; i < tx_scrqs; i++) { - ibmvnic_tx_scrq_clean_buffer(adapter, adapter->tx_scrq[i]); - rc = reset_one_tx_pool(adapter, &adapter->tso_pool[i]); - if (rc) - return rc; - rc = reset_one_tx_pool(adapter, &adapter->tx_pool[i]); - if (rc) - return rc; - } - - return 0; -} - static void release_vpd_data(struct ibmvnic_adapter *adapter) { if (!adapter->vpd) @@ -859,13 +812,13 @@ static void release_tx_pools(struct ibmvnic_adapter *adapter) kfree(adapter->tso_pool); adapter->tso_pool = NULL; adapter->num_active_tx_pools = 0; + adapter->prev_tx_pool_size = 0; } static int init_one_tx_pool(struct net_device *netdev, struct ibmvnic_tx_pool *tx_pool, int pool_size, int buf_size) { - struct ibmvnic_adapter *adapter = netdev_priv(netdev); int i; tx_pool->tx_buff = kcalloc(pool_size, @@ -874,13 +827,12 @@ static int init_one_tx_pool(struct net_device *netdev, if (!tx_pool->tx_buff) return -1; - if (alloc_long_term_buff(adapter, &tx_pool->long_term_buff, - pool_size * buf_size)) - return -1; - tx_pool->free_map = kcalloc(pool_size, sizeof(int), GFP_KERNEL); - if (!tx_pool->free_map) + if (!tx_pool->free_map) { + kfree(tx_pool->tx_buff); + tx_pool->tx_buff = NULL; return -1; + } for (i = 0; i < pool_size; i++) tx_pool->free_map[i] = i; @@ -893,6 +845,62 @@ static int init_one_tx_pool(struct net_device *netdev, return 0; } +/** + * reuse_tx_pools() - Check if the existing tx pools can be reused. + * @adapter: ibmvnic adapter + * + * Check if the existing tx pools in the adapter can be reused. The + * pools can be reused if the pool parameters (number of pools, + * number of buffers in the pool and mtu) have not changed. + * + * NOTE: This assumes that all pools have the same number of buffers + * which is the case currently. If that changes, we must fix this. + * + * Return: true if the tx pools can be reused, false otherwise. + */ +static bool reuse_tx_pools(struct ibmvnic_adapter *adapter) +{ + u64 old_num_pools, new_num_pools; + u64 old_pool_size, new_pool_size; + u64 old_mtu, new_mtu; + + if (!adapter->tx_pool) + return false; + + old_num_pools = adapter->num_active_tx_pools; + new_num_pools = adapter->num_active_tx_scrqs; + old_pool_size = adapter->prev_tx_pool_size; + new_pool_size = adapter->req_tx_entries_per_subcrq; + old_mtu = adapter->prev_mtu; + new_mtu = adapter->req_mtu; + + /* Require MTU to be exactly same to reuse pools for now */ + if (old_mtu != new_mtu) + return false; + + if (old_num_pools == new_num_pools && old_pool_size == new_pool_size) + return true; + + if (old_num_pools < adapter->min_tx_queues || + old_num_pools > adapter->max_tx_queues || + old_pool_size < adapter->min_tx_entries_per_subcrq || + old_pool_size > adapter->max_tx_entries_per_subcrq) + return false; + + return true; +} + +/** + * init_tx_pools(): Initialize the set of transmit pools in the adapter. + * @netdev: net device associated with the vnic interface + * + * Initialize the set of transmit pools in the ibmvnic adapter associated + * with the net_device @netdev. If possible, reuse the existing tx pools. + * Otherwise free any existing pools and allocate a new set of pools + * before initializing them. + * + * Return: 0 on success and negative value on error. + */ static int init_tx_pools(struct net_device *netdev) { struct ibmvnic_adapter *adapter = netdev_priv(netdev); @@ -900,7 +908,21 @@ static int init_tx_pools(struct net_device *netdev) int num_pools; u64 pool_size; /* # of buffers in pool */ u64 buff_size; - int i, rc; + int i, j, rc; + + num_pools = adapter->req_tx_queues; + + /* We must notify the VIOS about the LTB on all resets - but we only + * need to alloc/populate pools if either the number of buffers or + * size of each buffer in the pool has changed. + */ + if (reuse_tx_pools(adapter)) { + netdev_dbg(netdev, "Reusing tx pools\n"); + goto update_ltb; + } + + /* Allocate/populate the pools. */ + release_tx_pools(adapter); pool_size = adapter->req_tx_entries_per_subcrq; num_pools = adapter->num_active_tx_scrqs; @@ -925,6 +947,7 @@ static int init_tx_pools(struct net_device *netdev) * allocation, release_tx_pools() will know how many to look for. */ adapter->num_active_tx_pools = num_pools; + buff_size = adapter->req_mtu + VLAN_HLEN; buff_size = ALIGN(buff_size, L1_CACHE_BYTES); @@ -934,21 +957,73 @@ static int init_tx_pools(struct net_device *netdev) rc = init_one_tx_pool(netdev, &adapter->tx_pool[i], pool_size, buff_size); - if (rc) { - release_tx_pools(adapter); - return rc; - } + if (rc) + goto out_release; rc = init_one_tx_pool(netdev, &adapter->tso_pool[i], IBMVNIC_TSO_BUFS, IBMVNIC_TSO_BUF_SZ); - if (rc) { - release_tx_pools(adapter); - return rc; - } + if (rc) + goto out_release; + } + + adapter->prev_tx_pool_size = pool_size; + adapter->prev_mtu = adapter->req_mtu; + +update_ltb: + /* NOTE: All tx_pools have the same number of buffers (which is + * same as pool_size). All tso_pools have IBMVNIC_TSO_BUFS + * buffers (see calls init_one_tx_pool() for these). + * For consistency, we use tx_pool->num_buffers and + * tso_pool->num_buffers below. + */ + rc = -1; + for (i = 0; i < num_pools; i++) { + struct ibmvnic_tx_pool *tso_pool; + struct ibmvnic_tx_pool *tx_pool; + u32 ltb_size; + + tx_pool = &adapter->tx_pool[i]; + ltb_size = tx_pool->num_buffers * tx_pool->buf_size; + if (alloc_long_term_buff(adapter, &tx_pool->long_term_buff, + ltb_size)) + goto out; + + dev_dbg(dev, "Updated LTB for tx pool %d [%p, %d, %d]\n", + i, tx_pool->long_term_buff.buff, + tx_pool->num_buffers, tx_pool->buf_size); + + tx_pool->consumer_index = 0; + tx_pool->producer_index = 0; + + for (j = 0; j < tx_pool->num_buffers; j++) + tx_pool->free_map[j] = j; + + tso_pool = &adapter->tso_pool[i]; + ltb_size = tso_pool->num_buffers * tso_pool->buf_size; + if (alloc_long_term_buff(adapter, &tso_pool->long_term_buff, + ltb_size)) + goto out; + + dev_dbg(dev, "Updated LTB for tso pool %d [%p, %d, %d]\n", + i, tso_pool->long_term_buff.buff, + tso_pool->num_buffers, tso_pool->buf_size); + + tso_pool->consumer_index = 0; + tso_pool->producer_index = 0; + + for (j = 0; j < tso_pool->num_buffers; j++) + tso_pool->free_map[j] = j; } return 0; +out_release: + release_tx_pools(adapter); +out: + /* We failed to allocate one or more LTBs or map them on the VIOS. + * Hold onto the pools and any LTBs that we did allocate/map. + */ + return rc; } static void ibmvnic_napi_enable(struct ibmvnic_adapter *adapter) @@ -1139,8 +1214,6 @@ static void release_resources(struct ibmvnic_adapter *adapter) { release_vpd_data(adapter); - release_tx_pools(adapter); - release_napi(adapter); release_login_buffer(adapter); release_login_rsp_buffer(adapter); @@ -1413,6 +1486,7 @@ static int ibmvnic_open(struct net_device *netdev) netdev_err(netdev, "failed to initialize resources\n"); release_resources(adapter); release_rx_pools(adapter); + release_tx_pools(adapter); goto out; } } @@ -1541,8 +1615,6 @@ static void ibmvnic_cleanup(struct net_device *netdev) ibmvnic_napi_disable(adapter); ibmvnic_disable_irqs(adapter); - - clean_tx_pools(adapter); } static int __ibmvnic_close(struct net_device *netdev) @@ -1577,6 +1649,7 @@ static int ibmvnic_close(struct net_device *netdev) rc = __ibmvnic_close(netdev); ibmvnic_cleanup(netdev); clean_rx_pools(adapter); + clean_tx_pools(adapter); return rc; } @@ -2153,9 +2226,9 @@ static const char *reset_reason_to_string(enum ibmvnic_reset_reason reason) static int do_reset(struct ibmvnic_adapter *adapter, struct ibmvnic_rwi *rwi, u32 reset_state) { + struct net_device *netdev = adapter->netdev; u64 old_num_rx_queues, old_num_tx_queues; u64 old_num_rx_slots, old_num_tx_slots; - struct net_device *netdev = adapter->netdev; int rc; netdev_dbg(adapter->netdev, @@ -2305,7 +2378,6 @@ static int do_reset(struct ibmvnic_adapter *adapter, !adapter->rx_pool || !adapter->tso_pool || !adapter->tx_pool) { - release_tx_pools(adapter); release_napi(adapter); release_vpd_data(adapter); @@ -2314,9 +2386,10 @@ static int do_reset(struct ibmvnic_adapter *adapter, goto out; } else { - rc = reset_tx_pools(adapter); + rc = init_tx_pools(netdev); if (rc) { - netdev_dbg(adapter->netdev, "reset tx pools failed (%d)\n", + netdev_dbg(netdev, + "init tx pools failed (%d)\n", rc); goto out; } @@ -5661,6 +5734,7 @@ static int ibmvnic_probe(struct vio_dev *dev, const struct vio_device_id *id) init_completion(&adapter->stats_done); clear_bit(0, &adapter->resetting); adapter->prev_rx_buf_sz = 0; + adapter->prev_mtu = 0; init_success = false; do { @@ -5762,6 +5836,7 @@ static void ibmvnic_remove(struct vio_dev *dev) release_resources(adapter); release_rx_pools(adapter); + release_tx_pools(adapter); release_sub_crqs(adapter, 1); release_crq_queue(adapter); diff --git a/drivers/net/ethernet/ibm/ibmvnic.h b/drivers/net/ethernet/ibm/ibmvnic.h index b73a1b812368..b8e42f67d897 100644 --- a/drivers/net/ethernet/ibm/ibmvnic.h +++ b/drivers/net/ethernet/ibm/ibmvnic.h @@ -967,6 +967,7 @@ struct ibmvnic_adapter { u64 min_mtu; u64 max_mtu; u64 req_mtu; + u64 prev_mtu; u64 max_multicast_filters; u64 vlan_header_insertion; u64 rx_vlan_header_insertion; @@ -988,6 +989,7 @@ struct ibmvnic_adapter { u32 num_active_tx_pools; u32 prev_rx_pool_size; + u32 prev_tx_pool_size; u32 cur_rx_buf_sz; u32 prev_rx_buf_sz;