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[98.57.15.22]) by smtp.gmail.com with ESMTPSA id 006d021491bc7-65b35f2b1e5sm8948353eaf.3.2025.12.15.20.35.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 15 Dec 2025 20:35:57 -0800 (PST) From: Alexandru Gagniuc To: ath11k@lists.infradead.org, Jeff Johnson Cc: baochen.qiang@oss.qualcomm.com, Alexandru Gagniuc , linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2] wifi: ath11k: move .max_tx_ring to struct ath11k_hw_hal_params Date: Mon, 15 Dec 2025 22:35:52 -0600 Message-ID: <20251216043555.628296-1-mr.nuke.me@gmail.com> X-Mailer: git-send-email 2.45.1 Precedence: bulk X-Mailing-List: linux-wireless@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit ".max_tx_ring" is an upper bounds to indexing ".tcl2wbm_rbm_map". It is initialized in, core.c, a different file than the array. This spaghetti-like relation is fragile and not obvious. Accidentally setting ".max_tx_ring" too high leads to a hard to track out-of- bounds access and memory corruption. There is a small ambiguity on the meaning of "max_tx_ring": - The highest ring, max=3 implies there are 4 rings (0, 1, 2, 3) - The highest number to use for array indexing (there are 3 rings) Clarify this dependency by moving ".max_tx_ring" adjacent to the array ".tcl2wbm_rbm_map", and name it "num_tx_rings". Use ARRAY_SIZE() instead of #defines to initialize the length field. The ath11k_hw_hal_params_qca6390 uses fewer num_tx_rings than its map, so use a constant to express the correct value. Add a static_assert() to fail compilation if the constant is accidentally set too high. The intent is to make the code easier to understand rather than fix an existing bug. Signed-off-by: Alexandru Gagniuc --- I am trying to make ath11k work on IPQ9574. My device uses a IPQ9570 with a QCN5024 as the 2.4 GHz wifi. I spent a few days tracking a memory corruption bug caused by erroneously setting ".max_tx_ring" too high. I think I would not have made this mistake if the initializations of .max_tx_ring and .tcl2wbm_rbm_map were right next to each other. Changes since v1: - use "num_tx_rings" name instead of "map_len" - make sure debugfs.c is correctly updated - add a static_assert for ath11k_hw_hal_params_qca6390 special case drivers/net/wireless/ath/ath11k/core.c | 12 +----------- drivers/net/wireless/ath/ath11k/debugfs.c | 2 +- drivers/net/wireless/ath/ath11k/dp.c | 12 ++++++------ drivers/net/wireless/ath/ath11k/dp_tx.c | 9 +++++---- drivers/net/wireless/ath/ath11k/hw.c | 19 +++++++++++++++++++ drivers/net/wireless/ath/ath11k/hw.h | 3 ++- drivers/net/wireless/ath/ath11k/mac.c | 2 +- 7 files changed, 35 insertions(+), 24 deletions(-) diff --git a/drivers/net/wireless/ath/ath11k/core.c b/drivers/net/wireless/ath/ath11k/core.c index 812686173ac8a..07199ceecbeb4 100644 --- a/drivers/net/wireless/ath/ath11k/core.c +++ b/drivers/net/wireless/ath/ath11k/core.c @@ -100,7 +100,6 @@ static const struct ath11k_hw_params ath11k_hw_params[] = { .supports_regdb = false, .fix_l1ss = true, .credit_flow = false, - .max_tx_ring = DP_TCL_NUM_RING_MAX, .hal_params = &ath11k_hw_hal_params_ipq8074, .supports_dynamic_smps_6ghz = false, .alloc_cacheable_memory = true, @@ -184,7 +183,6 @@ static const struct ath11k_hw_params ath11k_hw_params[] = { .supports_regdb = false, .fix_l1ss = true, .credit_flow = false, - .max_tx_ring = DP_TCL_NUM_RING_MAX, .hal_params = &ath11k_hw_hal_params_ipq8074, .supports_dynamic_smps_6ghz = false, .alloc_cacheable_memory = true, @@ -271,7 +269,6 @@ static const struct ath11k_hw_params ath11k_hw_params[] = { .supports_regdb = false, .fix_l1ss = true, .credit_flow = true, - .max_tx_ring = DP_TCL_NUM_RING_MAX_QCA6390, .hal_params = &ath11k_hw_hal_params_qca6390, .supports_dynamic_smps_6ghz = false, .alloc_cacheable_memory = false, @@ -358,7 +355,6 @@ static const struct ath11k_hw_params ath11k_hw_params[] = { .supports_regdb = false, .fix_l1ss = true, .credit_flow = false, - .max_tx_ring = DP_TCL_NUM_RING_MAX, .hal_params = &ath11k_hw_hal_params_ipq8074, .supports_dynamic_smps_6ghz = true, .alloc_cacheable_memory = true, @@ -445,7 +441,6 @@ static const struct ath11k_hw_params ath11k_hw_params[] = { .supports_regdb = true, .fix_l1ss = false, .credit_flow = true, - .max_tx_ring = DP_TCL_NUM_RING_MAX_QCA6390, .hal_params = &ath11k_hw_hal_params_qca6390, .supports_dynamic_smps_6ghz = false, .alloc_cacheable_memory = false, @@ -533,7 +528,6 @@ static const struct ath11k_hw_params ath11k_hw_params[] = { .supports_regdb = true, .fix_l1ss = false, .credit_flow = true, - .max_tx_ring = DP_TCL_NUM_RING_MAX_QCA6390, .hal_params = &ath11k_hw_hal_params_qca6390, .supports_dynamic_smps_6ghz = false, .alloc_cacheable_memory = false, @@ -619,7 +613,6 @@ static const struct ath11k_hw_params ath11k_hw_params[] = { .supports_regdb = true, .fix_l1ss = false, .credit_flow = true, - .max_tx_ring = DP_TCL_NUM_RING_MAX, .hal_params = &ath11k_hw_hal_params_wcn6750, .supports_dynamic_smps_6ghz = false, .alloc_cacheable_memory = false, @@ -662,7 +655,6 @@ static const struct ath11k_hw_params ath11k_hw_params[] = { .qmi_service_ins_id = ATH11K_QMI_WLFW_SERVICE_INS_ID_V01_IPQ8074, .ring_mask = &ath11k_hw_ring_mask_ipq8074, .credit_flow = false, - .max_tx_ring = 1, .spectral = { .fft_sz = 2, .fft_pad_sz = 0, @@ -698,7 +690,7 @@ static const struct ath11k_hw_params ath11k_hw_params[] = { .supports_regdb = false, .idle_ps = false, .supports_suspend = false, - .hal_params = &ath11k_hw_hal_params_ipq8074, + .hal_params = &ath11k_hw_hal_params_ipq5018, .single_pdev_only = false, .coldboot_cal_mm = true, .coldboot_cal_ftm = true, @@ -789,7 +781,6 @@ static const struct ath11k_hw_params ath11k_hw_params[] = { .supports_regdb = true, .fix_l1ss = false, .credit_flow = true, - .max_tx_ring = DP_TCL_NUM_RING_MAX_QCA6390, .hal_params = &ath11k_hw_hal_params_qca6390, .supports_dynamic_smps_6ghz = false, .alloc_cacheable_memory = false, @@ -876,7 +867,6 @@ static const struct ath11k_hw_params ath11k_hw_params[] = { .supports_regdb = true, .fix_l1ss = false, .credit_flow = true, - .max_tx_ring = DP_TCL_NUM_RING_MAX_QCA6390, .hal_params = &ath11k_hw_hal_params_qca6390, .supports_dynamic_smps_6ghz = false, .alloc_cacheable_memory = false, diff --git a/drivers/net/wireless/ath/ath11k/debugfs.c b/drivers/net/wireless/ath/ath11k/debugfs.c index 977f945b6e669..50f344803e8fd 100644 --- a/drivers/net/wireless/ath/ath11k/debugfs.c +++ b/drivers/net/wireless/ath/ath11k/debugfs.c @@ -707,7 +707,7 @@ static ssize_t ath11k_debugfs_dump_soc_dp_stats(struct file *file, len += scnprintf(buf + len, size - len, "\nSOC TX STATS:\n"); len += scnprintf(buf + len, size - len, "\nTCL Ring Full Failures:\n"); - for (i = 0; i < ab->hw_params.max_tx_ring; i++) + for (i = 0; i < ab->hw_params.hal_params->num_tx_rings; i++) len += scnprintf(buf + len, size - len, "ring%d: %u\n", i, soc_stats->tx_err.desc_na[i]); diff --git a/drivers/net/wireless/ath/ath11k/dp.c b/drivers/net/wireless/ath/ath11k/dp.c index 56b1a657e0b0f..c940de285276d 100644 --- a/drivers/net/wireless/ath/ath11k/dp.c +++ b/drivers/net/wireless/ath/ath11k/dp.c @@ -344,7 +344,7 @@ void ath11k_dp_stop_shadow_timers(struct ath11k_base *ab) if (!ab->hw_params.supports_shadow_regs) return; - for (i = 0; i < ab->hw_params.max_tx_ring; i++) + for (i = 0; i < ab->hw_params.hal_params->num_tx_rings; i++) ath11k_dp_shadow_stop_timer(ab, &ab->dp.tx_ring_timer[i]); ath11k_dp_shadow_stop_timer(ab, &ab->dp.reo_cmd_timer); @@ -359,7 +359,7 @@ static void ath11k_dp_srng_common_cleanup(struct ath11k_base *ab) ath11k_dp_srng_cleanup(ab, &dp->wbm_desc_rel_ring); ath11k_dp_srng_cleanup(ab, &dp->tcl_cmd_ring); ath11k_dp_srng_cleanup(ab, &dp->tcl_status_ring); - for (i = 0; i < ab->hw_params.max_tx_ring; i++) { + for (i = 0; i < ab->hw_params.hal_params->num_tx_rings; i++) { ath11k_dp_srng_cleanup(ab, &dp->tx_ring[i].tcl_data_ring); ath11k_dp_srng_cleanup(ab, &dp->tx_ring[i].tcl_comp_ring); } @@ -400,7 +400,7 @@ static int ath11k_dp_srng_common_setup(struct ath11k_base *ab) goto err; } - for (i = 0; i < ab->hw_params.max_tx_ring; i++) { + for (i = 0; i < ab->hw_params.hal_params->num_tx_rings; i++) { tcl_num = ab->hw_params.hal_params->tcl2wbm_rbm_map[i].tcl_ring_num; wbm_num = ab->hw_params.hal_params->tcl2wbm_rbm_map[i].wbm_ring_num; @@ -782,7 +782,7 @@ int ath11k_dp_service_srng(struct ath11k_base *ab, int i, j; int tot_work_done = 0; - for (i = 0; i < ab->hw_params.max_tx_ring; i++) { + for (i = 0; i < ab->hw_params.hal_params->num_tx_rings; i++) { if (BIT(ab->hw_params.hal_params->tcl2wbm_rbm_map[i].wbm_ring_num) & ab->hw_params.ring_mask->tx[grp_id]) ath11k_dp_tx_completion_handler(ab, i); @@ -1035,7 +1035,7 @@ void ath11k_dp_free(struct ath11k_base *ab) ath11k_dp_reo_cmd_list_cleanup(ab); - for (i = 0; i < ab->hw_params.max_tx_ring; i++) { + for (i = 0; i < ab->hw_params.hal_params->num_tx_rings; i++) { spin_lock_bh(&dp->tx_ring[i].tx_idr_lock); idr_for_each(&dp->tx_ring[i].txbuf_idr, ath11k_dp_tx_pending_cleanup, ab); @@ -1086,7 +1086,7 @@ int ath11k_dp_alloc(struct ath11k_base *ab) size = sizeof(struct hal_wbm_release_ring) * DP_TX_COMP_RING_SIZE; - for (i = 0; i < ab->hw_params.max_tx_ring; i++) { + for (i = 0; i < ab->hw_params.hal_params->num_tx_rings; i++) { idr_init(&dp->tx_ring[i].txbuf_idr); spin_lock_init(&dp->tx_ring[i].tx_idr_lock); dp->tx_ring[i].tcl_data_ring_id = i; diff --git a/drivers/net/wireless/ath/ath11k/dp_tx.c b/drivers/net/wireless/ath/ath11k/dp_tx.c index 562aba66582f3..86e1e6c27b36c 100644 --- a/drivers/net/wireless/ath/ath11k/dp_tx.c +++ b/drivers/net/wireless/ath/ath11k/dp_tx.c @@ -91,6 +91,7 @@ int ath11k_dp_tx(struct ath11k *ar, struct ath11k_vif *arvif, struct hal_srng *tcl_ring; struct ieee80211_hdr *hdr = (void *)skb->data; struct dp_tx_ring *tx_ring; + size_t num_tx_rings = ab->hw_params.hal_params->num_tx_rings; void *hal_tcl_desc; u8 pool_id; u8 hal_ring_id; @@ -113,7 +114,7 @@ int ath11k_dp_tx(struct ath11k *ar, struct ath11k_vif *arvif, tcl_ring_sel: tcl_ring_retry = false; - ti.ring_id = ring_selector % ab->hw_params.max_tx_ring; + ti.ring_id = ring_selector % num_tx_rings; ti.rbm_id = ab->hw_params.hal_params->tcl2wbm_rbm_map[ti.ring_id].rbm_id; ring_map |= BIT(ti.ring_id); @@ -126,7 +127,7 @@ int ath11k_dp_tx(struct ath11k *ar, struct ath11k_vif *arvif, spin_unlock_bh(&tx_ring->tx_idr_lock); if (unlikely(ret < 0)) { - if (ring_map == (BIT(ab->hw_params.max_tx_ring) - 1) || + if (ring_map == (BIT(num_tx_rings) - 1) || !ab->hw_params.tcl_ring_retry) { atomic_inc(&ab->soc_stats.tx_err.misc_fail); return -ENOSPC; @@ -244,8 +245,8 @@ int ath11k_dp_tx(struct ath11k *ar, struct ath11k_vif *arvif, * checking this ring earlier for each pkt tx. * Restart ring selection if some rings are not checked yet. */ - if (unlikely(ring_map != (BIT(ab->hw_params.max_tx_ring)) - 1) && - ab->hw_params.tcl_ring_retry && ab->hw_params.max_tx_ring > 1) { + if (unlikely(ring_map != (BIT(num_tx_rings)) - 1) && + ab->hw_params.tcl_ring_retry && num_tx_rings > 1) { tcl_ring_retry = true; ring_selector++; } diff --git a/drivers/net/wireless/ath/ath11k/hw.c b/drivers/net/wireless/ath/ath11k/hw.c index caa6dc12a790b..bbaacdf76af0a 100644 --- a/drivers/net/wireless/ath/ath11k/hw.c +++ b/drivers/net/wireless/ath/ath11k/hw.c @@ -2707,6 +2707,14 @@ const struct ath11k_hw_regs wcn6750_regs = { .hal_reo1_misc_ctl = 0x000005d8, }; +static const struct ath11k_hw_tcl2wbm_rbm_map ath11k_hw_tcl2wbm_rbm_map_ipq5018[] = { + { + .tcl_ring_num = 0, + .wbm_ring_num = 0, + .rbm_id = HAL_RX_BUF_RBM_SW0_BM, + }, +}; + static const struct ath11k_hw_tcl2wbm_rbm_map ath11k_hw_tcl2wbm_rbm_map_ipq8074[] = { { .tcl_ring_num = 0, @@ -2822,19 +2830,30 @@ const struct ath11k_hw_regs ipq5018_regs = { .hal_wbm1_release_ring_base_lsb = 0x0000097c, }; +const struct ath11k_hw_hal_params ath11k_hw_hal_params_ipq5018 = { + .rx_buf_rbm = HAL_RX_BUF_RBM_SW3_BM, + .tcl2wbm_rbm_map = ath11k_hw_tcl2wbm_rbm_map_ipq5018, + .num_tx_rings = ARRAY_SIZE(ath11k_hw_tcl2wbm_rbm_map_ipq5018), +}; + const struct ath11k_hw_hal_params ath11k_hw_hal_params_ipq8074 = { .rx_buf_rbm = HAL_RX_BUF_RBM_SW3_BM, .tcl2wbm_rbm_map = ath11k_hw_tcl2wbm_rbm_map_ipq8074, + .num_tx_rings = ARRAY_SIZE(ath11k_hw_tcl2wbm_rbm_map_ipq8074), }; const struct ath11k_hw_hal_params ath11k_hw_hal_params_qca6390 = { .rx_buf_rbm = HAL_RX_BUF_RBM_SW1_BM, .tcl2wbm_rbm_map = ath11k_hw_tcl2wbm_rbm_map_ipq8074, + .num_tx_rings = DP_TCL_NUM_RING_MAX_QCA6390, }; +static_assert(ARRAY_SIZE(ath11k_hw_tcl2wbm_rbm_map_ipq8074) >= DP_TCL_NUM_RING_MAX_QCA6390); + const struct ath11k_hw_hal_params ath11k_hw_hal_params_wcn6750 = { .rx_buf_rbm = HAL_RX_BUF_RBM_SW1_BM, .tcl2wbm_rbm_map = ath11k_hw_tcl2wbm_rbm_map_wcn6750, + .num_tx_rings = ARRAY_SIZE(ath11k_hw_tcl2wbm_rbm_map_wcn6750), }; static const struct cfg80211_sar_freq_ranges ath11k_hw_sar_freq_ranges_wcn6855[] = { diff --git a/drivers/net/wireless/ath/ath11k/hw.h b/drivers/net/wireless/ath/ath11k/hw.h index 52d9f4c13b136..9db984ac4321c 100644 --- a/drivers/net/wireless/ath/ath11k/hw.h +++ b/drivers/net/wireless/ath/ath11k/hw.h @@ -134,6 +134,7 @@ struct ath11k_hw_tcl2wbm_rbm_map { struct ath11k_hw_hal_params { enum hal_rx_buf_return_buf_manager rx_buf_rbm; const struct ath11k_hw_tcl2wbm_rbm_map *tcl2wbm_rbm_map; + size_t num_tx_rings; }; struct ath11k_hw_params { @@ -198,7 +199,6 @@ struct ath11k_hw_params { bool supports_regdb; bool fix_l1ss; bool credit_flow; - u8 max_tx_ring; const struct ath11k_hw_hal_params *hal_params; bool supports_dynamic_smps_6ghz; bool alloc_cacheable_memory; @@ -291,6 +291,7 @@ extern const struct ce_ie_addr ath11k_ce_ie_addr_ipq5018; extern const struct ce_remap ath11k_ce_remap_ipq5018; +extern const struct ath11k_hw_hal_params ath11k_hw_hal_params_ipq5018; extern const struct ath11k_hw_hal_params ath11k_hw_hal_params_ipq8074; extern const struct ath11k_hw_hal_params ath11k_hw_hal_params_qca6390; extern const struct ath11k_hw_hal_params ath11k_hw_hal_params_wcn6750; diff --git a/drivers/net/wireless/ath/ath11k/mac.c b/drivers/net/wireless/ath/ath11k/mac.c index 3276fe443502f..33ebe03380114 100644 --- a/drivers/net/wireless/ath/ath11k/mac.c +++ b/drivers/net/wireless/ath/ath11k/mac.c @@ -7392,7 +7392,7 @@ static void ath11k_mac_op_remove_interface(struct ieee80211_hw *hw, idr_for_each(&ar->txmgmt_idr, ath11k_mac_vif_txmgmt_idr_remove, vif); - for (i = 0; i < ab->hw_params.max_tx_ring; i++) { + for (i = 0; i < ab->hw_params.hal_params->num_tx_rings; i++) { spin_lock_bh(&ab->dp.tx_ring[i].tx_idr_lock); idr_for_each(&ab->dp.tx_ring[i].txbuf_idr, ath11k_mac_vif_unref, vif); -- 2.45.1