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Fri, 31 Jul 2026 00:47:50 +0000 (GMT) Received: from smtpav01.dal12v.mail.ibm.com (smtpav01.dal12v.mail.ibm.com [10.241.53.100]) by smtprelay03.wdc07v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 66V0lCYA1966688 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 31 Jul 2026 00:47:12 GMT Received: from smtpav01.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 1CCF258058; Fri, 31 Jul 2026 00:47:49 +0000 (GMT) Received: from smtpav01.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 18ABC58057; Fri, 31 Jul 2026 00:47:48 +0000 (GMT) Received: from localhost.localdomain (unknown [9.61.44.71]) by smtpav01.dal12v.mail.ibm.com (Postfix) with ESMTP; Fri, 31 Jul 2026 00:47:48 +0000 (GMT) From: Mingming Cao To: netdev@vger.kernel.org Cc: horms@kernel.org, bjking1@linux.ibm.com, haren@linux.ibm.com, ricklind@linux.ibm.com, mmc@linux.ibm.com, kuba@kernel.org, edumazet@google.com, pabeni@redhat.com, davem@davemloft.net, linuxppc-dev@lists.ozlabs.org, maddy@linux.ibm.com, mpe@ellerman.id.au, simon.horman@corigine.com, shaik.abdulla1@ibm.com, Dave Marquardt Subject: [PATCH net-next v4 03/14] ibmveth: Refactor RX resource allocation for MQ RX bring-up Date: Thu, 30 Jul 2026 17:47:06 -0700 Message-Id: <984697bdc91a3c37f5f24750d7f24fc2d97031fa.1785457143.git.mmc@linux.ibm.com> X-Mailer: git-send-email 2.39.3 (Apple Git-146) In-Reply-To: References: X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-GUID: wBQWB2L4C2lVT0ObYHWpjcP3j_D7NONe X-Proofpoint-ORIG-GUID: 3uc2ztXwLYfumOpYSiB8xKibJkzC3zka X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzMxMDAwMyBTYWx0ZWRfX7I3qbANPUL5P Xpwb+4qS5Uh42apLtpn1jp+VAQjNz6s42CATDyc8FNrMI+F21lRsn8G8C7mJ4L/t5DB2yrPUGnl GGldcU7PqD7S1IHjBFYrmHG3zJ4haHPPAr6/ThG8GxjvvOoY/xlYT4NbZQTWAp9+H5ut7kkvROj 7XIjJGBEXpHR9yH/DB5Gyge0ND9F8dY0IHVZ/MOsEnG8DY4j5oFgjOaIbBd3GW3zy11qwBxAG4I UhAfwZJ95a1LQ45PGgzbRxU73K7pcCBHxs6AjJ1qh5h3uzEiwz8HtnNB6rZk1tErr1ZHU5N2dLL Vr7LbyVaACPOgjD8T+bvF0/TU6i3D524sqvobBuTRtrFPwFjcJGBzZEuFFaS6t4XgqXJ6+rn1V+ QUiA9NjrWX4sPr3yWVl43oDqqznTnBEYY5ZHfco08FBL6IwoOf6YZenwyP5E3rCUXqqE2Oy+h/L J4+TsAvOmMdQMJ/PRQw== X-Authority-Analysis: v=2.4 cv=SKFykuvH c=1 sm=1 tr=0 ts=6a6bf0b8 cx=c_pps a=GFwsV6G8L6GxiO2Y/PsHdQ==:117 a=GFwsV6G8L6GxiO2Y/PsHdQ==:17 a=RAioF0-LDSMA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=iQ6ETzBq9ecOQQE5vZCe:22 a=VnNF1IyMAAAA:8 a=KtG_EaNFNuEweZuq3VEA:9 X-Proofpoint-Spam-Info: AW1haW4tMjYwNzMxMDAwMyBTYWx0ZWRfX6Tgse6vGDyrj nxBl7V+SnDZaBewA83MrqLhfwFXUspWkcTmQdYi5OY7t/n20oE4iNg5AG7IjIRuKTzUYNeSCgAF wkI2XlV21RS+c2W34nhga5na9ioP7jc= X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-07-30_07,2026-07-30_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 clxscore=1015 adultscore=0 lowpriorityscore=0 bulkscore=0 impostorscore=0 phishscore=0 spamscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607310003 ibmveth_open() allocates the filter list and every RX queue inline. That is already a long sequence and would get uglier once we loop over num_rx_queues, especially on error unwind. Pull the RX bits into helpers and wire them into open()/close() in the same patch: ibmveth_alloc_filter_list() / ibmveth_free_filter_list() - shared multicast filter list (one per adapter, not per queue) ibmveth_alloc_rx_queues() / ibmveth_cleanup_rx_resources() - per-queue buffer lists and RX rings, looping [0, num_rx_queues) alloc_rx_queues() rolls back on failure so open() does not need nested goto chains for every queue index. open-failure and close release the same resources through the same helpers. Runtime behavior stays single-queue (num_rx_queues is still 1). Buffer pools, IRQ, TX LTB, and PHYP registration remain inline for later helper patches. Also set rc = -ENOMEM before the TX LTB allocation loop so a failed ibmveth_allocate_tx_ltb() still returns a useful errno after the RX allocation blocks move into helpers. Signed-off-by: Mingming Cao Reviewed-by: Dave Marquardt Tested-by: Shaik Abdulla --- Changes in v4: - Introduce RX/filter allocation helpers in the same patch that wires their first open/close callers; v3 left unused statics ahead of the old open/close pipeline patch. - Preserve correct -ENOMEM return on TX LTB allocation failure after the RX helper extract. - Drop reliance on v3's separate "open/close pipeline" patch for this wiring. drivers/net/ethernet/ibm/ibmveth.c | 268 ++++++++++++++++++++--------- 1 file changed, 190 insertions(+), 78 deletions(-) diff --git a/drivers/net/ethernet/ibm/ibmveth.c b/drivers/net/ethernet/ibm/ibmveth.c index 8e758362cb26..1007dd95cde0 100644 --- a/drivers/net/ethernet/ibm/ibmveth.c +++ b/drivers/net/ethernet/ibm/ibmveth.c @@ -151,6 +151,184 @@ static unsigned int ibmveth_real_max_tx_queues(void) return min(n_cpu, IBMVETH_MAX_QUEUES); } +/** + * ibmveth_alloc_filter_list - Allocate and map filter list + * @adapter: ibmveth adapter structure + * + * Return: 0 on success, negative error code on failure + */ +static int +ibmveth_alloc_filter_list(struct ibmveth_adapter *adapter) +{ + struct device *dev = &adapter->vdev->dev; + struct net_device *netdev = adapter->netdev; + + adapter->filter_list_addr = (void *)get_zeroed_page(GFP_KERNEL); + if (!adapter->filter_list_addr) { + netdev_err(netdev, "unable to allocate filter pages\n"); + return -ENOMEM; + } + + adapter->filter_list_dma = dma_map_single(dev, + adapter->filter_list_addr, + 4096, DMA_BIDIRECTIONAL); + if (dma_mapping_error(dev, adapter->filter_list_dma)) { + netdev_err(netdev, "unable to map filter list pages\n"); + free_page((unsigned long)adapter->filter_list_addr); + adapter->filter_list_addr = NULL; + return -ENOMEM; + } + + netdev_dbg(netdev, "filter list @ 0x%p (DMA: 0x%llx)\n", + adapter->filter_list_addr, + (unsigned long long)adapter->filter_list_dma); + + return 0; +} + +/** + * ibmveth_free_filter_list - Free filter list resources + * @adapter: ibmveth adapter structure + */ +static void +ibmveth_free_filter_list(struct ibmveth_adapter *adapter) +{ + struct device *dev = &adapter->vdev->dev; + + if (adapter->filter_list_dma) { + dma_unmap_single(dev, adapter->filter_list_dma, 4096, + DMA_BIDIRECTIONAL); + adapter->filter_list_dma = 0; + } + + if (adapter->filter_list_addr) { + free_page((unsigned long)adapter->filter_list_addr); + adapter->filter_list_addr = NULL; + } +} + +/** + * ibmveth_alloc_rx_queues - Allocate per-queue RX resources + * @adapter: ibmveth adapter structure + * @rxq_entries: Number of entries per RX queue + * + * Return: 0 on success, negative error code on failure + */ +static int +ibmveth_alloc_rx_queues(struct ibmveth_adapter *adapter, int rxq_entries) +{ + struct device *dev = &adapter->vdev->dev; + struct net_device *netdev = adapter->netdev; + int i; + + for (i = 0; i < adapter->num_rx_queues; i++) { + adapter->buffer_list_addr[i] = + (void *)get_zeroed_page(GFP_KERNEL); + if (!adapter->buffer_list_addr[i]) { + netdev_err(netdev, + "unable to allocate buffer list for queue %d\n", + i); + goto err_cleanup; + } + + adapter->rx_queue[i].queue_len = + sizeof(struct ibmveth_rx_q_entry) * rxq_entries; + adapter->rx_queue[i].queue_addr = + dma_alloc_coherent(dev, adapter->rx_queue[i].queue_len, + &adapter->rx_queue[i].queue_dma, + GFP_KERNEL); + if (!adapter->rx_queue[i].queue_addr) { + netdev_err(netdev, + "unable to allocate RX queue for queue %d\n", + i); + goto err_cleanup; + } + + adapter->buffer_list_dma[i] = + dma_map_single(dev, adapter->buffer_list_addr[i], + 4096, DMA_BIDIRECTIONAL); + if (dma_mapping_error(dev, adapter->buffer_list_dma[i])) { + netdev_err(netdev, + "unable to map buffer list for queue %d\n", + i); + adapter->buffer_list_dma[i] = 0; + goto err_cleanup; + } + + adapter->rx_queue[i].index = 0; + adapter->rx_queue[i].num_slots = rxq_entries; + adapter->rx_queue[i].toggle = 1; + + netdev_dbg(netdev, "queue %d: buffer_list @ 0x%p (DMA: 0x%llx), rx_queue @ 0x%p (DMA: 0x%llx), %llu entries\n", + i, adapter->buffer_list_addr[i], + (unsigned long long)adapter->buffer_list_dma[i], + adapter->rx_queue[i].queue_addr, + (unsigned long long)adapter->rx_queue[i].queue_dma, + (unsigned long long)rxq_entries); + } + + netdev_dbg(netdev, "allocated %d RX queue(s) with %d entries each\n", + adapter->num_rx_queues, rxq_entries); + + return 0; + +err_cleanup: + /* Clean up previously allocated queues */ + for (; i >= 0; i--) { + if (adapter->buffer_list_dma[i]) { + dma_unmap_single(dev, adapter->buffer_list_dma[i], + 4096, DMA_BIDIRECTIONAL); + adapter->buffer_list_dma[i] = 0; + } + if (adapter->rx_queue[i].queue_addr) { + dma_free_coherent(dev, adapter->rx_queue[i].queue_len, + adapter->rx_queue[i].queue_addr, + adapter->rx_queue[i].queue_dma); + adapter->rx_queue[i].queue_addr = NULL; + } + if (adapter->buffer_list_addr[i]) { + free_page((unsigned long)adapter->buffer_list_addr[i]); + adapter->buffer_list_addr[i] = NULL; + } + } + + return -ENOMEM; +} + +/** + * ibmveth_cleanup_rx_resources - Free all RX queue resources + * @adapter: ibmveth adapter structure + */ +static void +ibmveth_cleanup_rx_resources(struct ibmveth_adapter *adapter) +{ + struct device *dev = &adapter->vdev->dev; + int i; + + netdev_dbg(adapter->netdev, "cleaning up %d RX queue(s)\n", + adapter->num_rx_queues); + + for (i = 0; i < adapter->num_rx_queues; i++) { + if (adapter->buffer_list_dma[i]) { + dma_unmap_single(dev, adapter->buffer_list_dma[i], + 4096, DMA_BIDIRECTIONAL); + adapter->buffer_list_dma[i] = 0; + } + + if (adapter->rx_queue[i].queue_addr) { + dma_free_coherent(dev, adapter->rx_queue[i].queue_len, + adapter->rx_queue[i].queue_addr, + adapter->rx_queue[i].queue_dma); + adapter->rx_queue[i].queue_addr = NULL; + } + + if (adapter->buffer_list_addr[i]) { + free_page((unsigned long)adapter->buffer_list_addr[i]); + adapter->buffer_list_addr[i] = NULL; + } + } +} + /* setup the initial settings for a buffer pool */ static void ibmveth_init_buffer_pool(struct ibmveth_buff_pool *pool, u32 pool_index, u32 pool_size, @@ -627,74 +805,34 @@ static int ibmveth_open(struct net_device *netdev) int rc; union ibmveth_buf_desc rxq_desc; int i; - struct device *dev; netdev_dbg(netdev, "open starting\n"); napi_enable(&adapter->napi[0]); - for(i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) + for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) rxq_entries += adapter->rx_buff_pool[0][i].size; - rc = -ENOMEM; - adapter->buffer_list_addr[0] = (void *)get_zeroed_page(GFP_KERNEL); - if (!adapter->buffer_list_addr[0]) { - netdev_err(netdev, "unable to allocate list pages\n"); + rc = ibmveth_alloc_filter_list(adapter); + if (rc) goto out; - } - adapter->filter_list_addr = (void*) get_zeroed_page(GFP_KERNEL); - if (!adapter->filter_list_addr) { - netdev_err(netdev, "unable to allocate filter pages\n"); - goto out_free_buffer_list; - } - - dev = &adapter->vdev->dev; - - adapter->rx_queue[0].queue_len = sizeof(struct ibmveth_rx_q_entry) * - rxq_entries; - adapter->rx_queue[0].queue_addr = - dma_alloc_coherent(dev, adapter->rx_queue[0].queue_len, - &adapter->rx_queue[0].queue_dma, GFP_KERNEL); - if (!adapter->rx_queue[0].queue_addr) + rc = ibmveth_alloc_rx_queues(adapter, rxq_entries); + if (rc) goto out_free_filter_list; - adapter->buffer_list_dma[0] = - dma_map_single(dev, adapter->buffer_list_addr[0], - 4096, DMA_BIDIRECTIONAL); - if (dma_mapping_error(dev, adapter->buffer_list_dma[0])) { - netdev_err(netdev, "unable to map buffer list pages\n"); - goto out_free_queue_mem; - } - - adapter->filter_list_dma = dma_map_single(dev, - adapter->filter_list_addr, 4096, DMA_BIDIRECTIONAL); - if (dma_mapping_error(dev, adapter->filter_list_dma)) { - netdev_err(netdev, "unable to map filter list pages\n"); - goto out_unmap_buffer_list; - } - + rc = -ENOMEM; for (i = 0; i < netdev->real_num_tx_queues; i++) { if (ibmveth_allocate_tx_ltb(adapter, i)) goto out_free_tx_ltb; } - adapter->rx_queue[0].index = 0; - adapter->rx_queue[0].num_slots = rxq_entries; - adapter->rx_queue[0].toggle = 1; - mac_address = ether_addr_to_u64(netdev->dev_addr); rxq_desc.fields.flags_len = IBMVETH_BUF_VALID | adapter->rx_queue[0].queue_len; rxq_desc.fields.address = adapter->rx_queue[0].queue_dma; - netdev_dbg(netdev, "buffer list @ 0x%p\n", - adapter->buffer_list_addr[0]); - netdev_dbg(netdev, "filter list @ 0x%p\n", adapter->filter_list_addr); - netdev_dbg(netdev, "receive q @ 0x%p\n", - adapter->rx_queue[0].queue_addr); - h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE); lpar_rc = ibmveth_register_logical_lan(adapter, rxq_desc, mac_address); @@ -709,7 +847,7 @@ static int ibmveth_open(struct net_device *netdev) rxq_desc.desc, mac_address); rc = -ENONET; - goto out_unmap_filter_list; + goto out_free_tx_ltb; } for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) { @@ -736,8 +874,6 @@ static int ibmveth_open(struct net_device *netdev) goto out_free_buffer_pools; } - rc = -ENOMEM; - netdev_dbg(netdev, "initial replenish cycle\n"); ibmveth_interrupt(netdev->irq, netdev); @@ -753,26 +889,12 @@ static int ibmveth_open(struct net_device *netdev) ibmveth_free_buffer_pool(adapter, &adapter->rx_buff_pool[0][i]); } -out_unmap_filter_list: - dma_unmap_single(dev, adapter->filter_list_dma, 4096, - DMA_BIDIRECTIONAL); - out_free_tx_ltb: - while (--i >= 0) { + while (--i >= 0) ibmveth_free_tx_ltb(adapter, i); - } - -out_unmap_buffer_list: - dma_unmap_single(dev, adapter->buffer_list_dma[0], 4096, - DMA_BIDIRECTIONAL); -out_free_queue_mem: - dma_free_coherent(dev, adapter->rx_queue[0].queue_len, - adapter->rx_queue[0].queue_addr, - adapter->rx_queue[0].queue_dma); + ibmveth_cleanup_rx_resources(adapter); out_free_filter_list: - free_page((unsigned long)adapter->filter_list_addr); -out_free_buffer_list: - free_page((unsigned long)adapter->buffer_list_addr[0]); + ibmveth_free_filter_list(adapter); out: napi_disable(&adapter->napi[0]); return rc; @@ -781,7 +903,6 @@ static int ibmveth_open(struct net_device *netdev) static int ibmveth_close(struct net_device *netdev) { struct ibmveth_adapter *adapter = netdev_priv(netdev); - struct device *dev = &adapter->vdev->dev; long lpar_rc; int i; @@ -806,17 +927,8 @@ static int ibmveth_close(struct net_device *netdev) ibmveth_update_rx_no_buffer(adapter); - dma_unmap_single(dev, adapter->buffer_list_dma[0], 4096, - DMA_BIDIRECTIONAL); - free_page((unsigned long)adapter->buffer_list_addr[0]); - - dma_unmap_single(dev, adapter->filter_list_dma, 4096, - DMA_BIDIRECTIONAL); - free_page((unsigned long)adapter->filter_list_addr); - - dma_free_coherent(dev, adapter->rx_queue[0].queue_len, - adapter->rx_queue[0].queue_addr, - adapter->rx_queue[0].queue_dma); + ibmveth_cleanup_rx_resources(adapter); + ibmveth_free_filter_list(adapter); for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) if (adapter->rx_buff_pool[0][i].active) -- 2.50.1 (Apple Git-155)