Date: Thu, 1 May 2025 18:15:15 GMT From: Arthur Kiyanovski <akiyano@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: 162b5bbb4048 - stable/13 - ena: Fix misconfiguration when requesting regular LLQ Message-ID: <202505011815.541IFFpH084880@gitrepo.freebsd.org>
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The branch stable/13 has been updated by akiyano: URL: https://cgit.FreeBSD.org/src/commit/?id=162b5bbb4048d0ba99d759616c127ba04c9289c3 commit 162b5bbb4048d0ba99d759616c127ba04c9289c3 Author: David Arinzon <darinzon@amazon.com> AuthorDate: 2025-04-22 10:54:18 +0000 Commit: Arthur Kiyanovski <akiyano@FreeBSD.org> CommitDate: 2025-05-01 18:14:30 +0000 ena: Fix misconfiguration when requesting regular LLQ Patch 0a33c047a443 introduced new values to hw.ena.force_large_llq_header. The default value of 2 means no preference, while 0 and 1 act as the previous false and true respectively, which allowed forcefully setting regular or large LLQ. There are 2 ways to force the driver to select regular LLQ: 1. Setting hw.ena.force_large_llq_header = 0 via sysctl. 2. Turning on ena express, which makes the recommendation by the FW to be regular LLQ. When the device supports large LLQ but the driver is forced to regular LLQ, llq_config->llq_ring_entry_size_value is never initialized and since it is a variable allocated on the stack, it stays garbage. Since this variable is involved in calculating max_entries_in_tx_burst, it could cause the maximum burst size to be zero. This causes the driver to ignore the real maximum burst size of the device, leading to driver resets in devices that have a maximum burst size (Nitro v4 and on. see [1] for more information). In case the garbage value is 0, the calculation of max_entries_in_tx_burst divides by 0 and causes kernel panic. The patch modifies the logic to take into account all use-cases and ensure that the relevant fields are properly initialized. [1]: https://docs.aws.amazon.com/ec2/latest/instancetypes/ec2-nitro-instances.html Fixes: 0a33c047a443 ("ena: Support LLQ entry size recommendation from device") Approved by: cperciva (mentor) Sponsored by: Amazon, Inc. Differential Revision: https://reviews.freebsd.org/D50040 (cherry picked from commit 56c45700f2ae15755358f2da8266247613c564df) --- sys/dev/ena/ena.c | 41 ++++++++++++++++++++++++++++++----------- 1 file changed, 30 insertions(+), 11 deletions(-) diff --git a/sys/dev/ena/ena.c b/sys/dev/ena/ena.c index a0d3cf28861e..f9342ad91ae2 100644 --- a/sys/dev/ena/ena.c +++ b/sys/dev/ena/ena.c @@ -2760,22 +2760,41 @@ static inline void ena_set_llq_configurations(struct ena_llq_configurations *llq_config, struct ena_admin_feature_llq_desc *llq, struct ena_adapter *adapter) { + bool use_large_llq; + llq_config->llq_header_location = ENA_ADMIN_INLINE_HEADER; llq_config->llq_stride_ctrl = ENA_ADMIN_MULTIPLE_DESCS_PER_ENTRY; llq_config->llq_num_decs_before_header = ENA_ADMIN_LLQ_NUM_DESCS_BEFORE_HEADER_2; - if ((llq->entry_size_ctrl_supported & ENA_ADMIN_LIST_ENTRY_SIZE_256B) != 0) { - if ((ena_force_large_llq_header == ENA_LLQ_HEADER_SIZE_POLICY_LARGE) || - (ena_force_large_llq_header == ENA_LLQ_HEADER_SIZE_POLICY_DEFAULT && - llq->entry_size_recommended == ENA_ADMIN_LIST_ENTRY_SIZE_256B)) { - llq_config->llq_ring_entry_size = - ENA_ADMIN_LIST_ENTRY_SIZE_256B; - llq_config->llq_ring_entry_size_value = 256; - adapter->llq_policy = ENA_ADMIN_LIST_ENTRY_SIZE_256B; - } + + switch (ena_force_large_llq_header) + { + case ENA_LLQ_HEADER_SIZE_POLICY_REGULAR: + use_large_llq = false; + break; + case ENA_LLQ_HEADER_SIZE_POLICY_LARGE: + use_large_llq = true; + break; + case ENA_LLQ_HEADER_SIZE_POLICY_DEFAULT: + use_large_llq = + (llq->entry_size_recommended == ENA_ADMIN_LIST_ENTRY_SIZE_256B); + break; + default: + use_large_llq = false; + ena_log(adapter->pdev, WARN, + "force_large_llq_header should have values [0-2]\n"); + break; + } + + if (!(llq->entry_size_ctrl_supported & ENA_ADMIN_LIST_ENTRY_SIZE_256B)) + use_large_llq = false; + + if (use_large_llq) { + llq_config->llq_ring_entry_size = ENA_ADMIN_LIST_ENTRY_SIZE_256B; + llq_config->llq_ring_entry_size_value = 256; + adapter->llq_policy = ENA_ADMIN_LIST_ENTRY_SIZE_256B; } else { - llq_config->llq_ring_entry_size = - ENA_ADMIN_LIST_ENTRY_SIZE_128B; + llq_config->llq_ring_entry_size = ENA_ADMIN_LIST_ENTRY_SIZE_128B; llq_config->llq_ring_entry_size_value = 128; adapter->llq_policy = ENA_ADMIN_LIST_ENTRY_SIZE_128B; }
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