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Mon, 9 Nov 2026 23:57:01 +0000 (GMT) Received: from localhost.localdomain (unknown [9.67.169.223]) by smtpav02.wdc07v.mail.ibm.com (Postfix) with ESMTP; Mon, 9 Nov 2026 23:57:01 +0000 (GMT) From: Mingming Cao To: netdev@vger.kernel.org Cc: Mingming Cao , davem@davemloft.net, kuba@kernel.org, horms@kernel.org, edumazet@kernel.org, pabeni@redhat.com, andrew+netdev@lunn.ch, nnac123@linux.ibm.com, maddy@linux.ibm.com, mpe@ellerman.id.au, linuxppc-dev@lists.ozlabs.org, npiggin@gmail.com, chleroy@kernel.org, ritesh.list@gmail.com, sshegde@linux.ibm.com, haren@linux.ibm.com, ricklind@linux.ibm.com, davemarq@linux.ibm.com, bjking1@linux.ibm.com, shaik.abdulla1@ibm.com Subject: [PATCH net-next v8 12/15] ibmveth: Report MQ-aware RX counts in ethtool get_channels Date: Mon, 9 Nov 2026 15:55:53 -0800 Message-Id: <20261109235556.60604-13-mmc@linux.ibm.com> X-Mailer: git-send-email 2.39.3 (Apple Git-146) In-Reply-To: <20261109235556.60604-1-mmc@linux.ibm.com> References: <20261109235556.60604-1-mmc@linux.ibm.com> X-Mailing-List: netdev@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-Spam-Info: AW1haW4tMjYxMTA5MDA5NCBTYWx0ZWRfXzEAYG0EnRxAQ YT4qk5cRWl0NEga6zP3AqByjzLpP9nN9HeaM20bA/TpnXlMcYP9t7JGrZX4+HAtQrcqLGunUTLE sGeGSBMA2xJPASjO8F6lz/Av3ucAvkc= X-Authority-Analysis: v=2.4 cv=GISdgeNK c=1 sm=1 tr=0 ts=6af25dd3 cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=zJRp6_cAMcgA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=RzCfie-kr_QcCd8fBx8p:22 a=VnNF1IyMAAAA:8 a=OHkRmo7XnONMdPLYg5MA:9 a=O8hF6Hzn-FEA:10 X-Proofpoint-GUID: wVbhvH-MnqYPJe-c9hNlo8VDXvc_bVwo X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMTA5MDA5NCBTYWx0ZWRfX40UWc9PnSUod wQyDyutNzF+Y5qa/0kTW43nHTiDCHLFAkRrNKi+spVzAjo15+FQu6nx+2B2Jq7zX11RMDOvC9j4 /ecoXZsk6R4SpnQ/Vm343C1dCtJuB8EfT3sZ4NpM2SOWdDZp3sGSxbqyYqbyTLnbbuLwkJPNj6f YheSZ180EjcnV+/lU8ecP3duN2GsJgg8j/Jmr7J8hZCiygap5R8yoyIisP0ustdEqa7hUe6x4sc Vur7SnD2mrrRIY34cJ1gmSjFWTu8gBeZ9W3yLEqD6Mq1QeEQVvjO3lmDvSXnDSMd4lf+FKzHmWP x/W3BIyjWoZf4vlQsYbg3mFqsqHPShgd33b5wbokXlJJ3l3iWcEBUOl9X0TcMhh8InvtxMEVDoI JA3eXzPQR5Yb/QtAw1fhBZUJ1DUrXfvowxDwI/UiJX9CgdqRJyqMu3dL+LhlSBfe0SuMYfbWksd VkzYT6Lwc2XbFKGStxA== X-Proofpoint-ORIG-GUID: uhh0evd2nws06A1bEcv00w133KX5a88o X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.138,FMLib:17.12.100.49 definitions=2026-11-09_07,2026-11-06_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 bulkscore=0 impostorscore=0 clxscore=1015 adultscore=0 priorityscore=1501 phishscore=0 spamscore=0 malwarescore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2611040001 definitions=main-2611090094 Report MQ-aware channel limits and counts from get_channels(): - max_rx is IBMVETH_MAX_RX_QUEUES when MQ firmware is enabled and mq_fallback is not set, else the live rx_count - rx_count tracks the driver's published num_rx_queues Previously get_channels() mirrored netdev->real_num_rx_queues for both fields, which under-reports max_rx on MQ firmware. Here every publish of num_rx_queues is paired with a matching real_num, so rx_count does not change yet; reading the published count keeps it right once the resize patches can publish a count that real_num fails to reach. This patch only reports. The set_channels() rx_count reject lives in the MQ enable patch; the live RX set lands with the incremental resize patch. Once mq_fallback is set but not yet applied, rx_count is still N until the next open; max_rx follows rx_count rather than dropping to 1, because the ethtool core rejects a TX-only -L that resubmits rx_count above max_rx. mq_fallback is set from the replenish path without RTNL and is now read under RTNL here, so its accesses use READ_ONCE()/WRITE_ONCE(), including the two writers the MQ enable patch added. Keep this out of the stats patch: channel reporting is ethtool -l ABI, independent of per-queue counters, so it can be reviewed and blamed on its own. Signed-off-by: Mingming Cao Reviewed-by: Dave Marquardt Tested-by: Shaik Abdulla --- Changes in v8: - get_channels max_rx is the live rx_count when single queue or once mq_fallback is set, not a fixed 1 (the v7 patch 15 cap moves here) - mq_fallback uses READ_ONCE()/WRITE_ONCE(): replenish writes it without RTNL - the set_channels rx_count reject is now in patch 10 Changes in v7: - reject rx_count change with -EOPNOTSUPP in set_channels() until patch 14 implements resize - noted: TX-only read-modify-write still passes; max_rx stays here (reject, not reorder); get_channels uses the adapter count, get_base_stats uses real_num; RX max is MAX_RX_QUEUES, not the TX CPU cap; P14 wires live rx_count resize; P15 is the tip ABI (live rx_count, max_rx cap on mq_fallback, max_tx at least the live tx_count) Changes in v5: - get_channels rx_count via get_num_rx_queues() (READ_ONCE consistency) - New peel: get_channels from v4 stats -> tip P12 (14->15) - get_channels: max_rx = MAX_RX_QUEUES when MQ else 1; rx_count = get_num_rx_queues() (was mirroring real_num_rx_queues for both) drivers/net/ethernet/ibm/ibmveth.c | 17 +++++++++++------ drivers/net/ethernet/ibm/ibmveth.h | 1 + 2 files changed, 12 insertions(+), 6 deletions(-) diff --git a/drivers/net/ethernet/ibm/ibmveth.c b/drivers/net/ethernet/ibm/ibmveth.c index 45adf6e9be09..1e2e845f8011 100644 --- a/drivers/net/ethernet/ibm/ibmveth.c +++ b/drivers/net/ethernet/ibm/ibmveth.c @@ -1306,7 +1306,7 @@ static void ibmveth_replenish_task(struct ibmveth_adapter *adapter, dev_err_ratelimited(&adapter->netdev->dev, "MQ buffer add H_FUNCTION (q=%d, batch=%u), reset\n", queue_index, fail.batch); - adapter->mq_fallback = true; + WRITE_ONCE(adapter->mq_fallback, true); schedule_work(&adapter->work); } @@ -2152,7 +2152,7 @@ ibmveth_register_rx_queues(struct ibmveth_adapter *adapter, u64 mac_address, if (rc) { /* Firmware MQ gone: fall back to SQ on next open. */ if (rc == -EOPNOTSUPP) - adapter->mq_fallback = true; + WRITE_ONCE(adapter->mq_fallback, true); goto err_unregister; } } @@ -2192,10 +2192,10 @@ static void ibmveth_apply_mq_fallback(struct ibmveth_adapter *adapter) { struct net_device *netdev = adapter->netdev; - if (!adapter->mq_fallback) + if (!READ_ONCE(adapter->mq_fallback)) return; - adapter->mq_fallback = false; + WRITE_ONCE(adapter->mq_fallback, false); if (!adapter->multi_queue && ibmveth_get_num_rx_queues(adapter) == 1) return; @@ -2756,11 +2756,16 @@ static void ibmveth_get_ethtool_stats(struct net_device *dev, static void ibmveth_get_channels(struct net_device *netdev, struct ethtool_channels *channels) { + struct ibmveth_adapter *adapter = netdev_priv(netdev); + channels->max_tx = ibmveth_real_max_tx_queues(); channels->tx_count = netdev->real_num_tx_queues; - channels->max_rx = netdev->real_num_rx_queues; - channels->rx_count = netdev->real_num_rx_queues; + channels->rx_count = ibmveth_get_num_rx_queues(adapter); + if (adapter->multi_queue && !READ_ONCE(adapter->mq_fallback)) + channels->max_rx = IBMVETH_MAX_RX_QUEUES; + else + channels->max_rx = channels->rx_count; } static int ibmveth_set_channels(struct net_device *netdev, diff --git a/drivers/net/ethernet/ibm/ibmveth.h b/drivers/net/ethernet/ibm/ibmveth.h index 76640bd5598e..66288f8e8349 100644 --- a/drivers/net/ethernet/ibm/ibmveth.h +++ b/drivers/net/ethernet/ibm/ibmveth.h @@ -374,6 +374,7 @@ struct ibmveth_adapter { char queue_irq_name[IBMVETH_MAX_RX_QUEUES][32]; bool multi_queue; unsigned int num_rx_queues; + /* Set from replenish without RTNL: READ_ONCE()/WRITE_ONCE(). */ bool mq_fallback; /* Lifetime: true while RX IRQ handlers / NAPI are installed. */ bool rx_irq_setup; -- 2.50.1 (Apple Git-155)