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([2403:8600:2090:6f:1840:f07b:ed1c:fca2]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-13b3c7fa65asm56885602c88.6.2026.07.06.08.47.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 06 Jul 2026 08:47:40 -0700 (PDT) From: Aniket Negi To: netdev@vger.kernel.org, lorenzo@kernel.org Cc: matthias.bgg@gmail.com, angelogioacchino.delregno@collabora.com, aniket.negi@airoha.com, kuldeep.malik@airoha.com, Aniket Negi , Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Christian Marangi , linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH net v4] net: airoha: fix MIB stats collection to be lossless Date: Mon, 6 Jul 2026 21:17:30 +0530 Message-ID: <20260706154730.36949-1-aniket.negi03@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit REG_FE_GDM_MIB_CLEAR after every read creates a race window where packets arriving between read and clear are lost from statistics. Switch to a delta-based approach instead: - 64-bit H+L registers (ok pkts/bytes, E64..L1023): read absolute hardware total directly; use a local variable and max(new, old) clamping to prevent intermediate visibility and torn-read regression. - 32-bit registers (drops, bc, mc, errors, runt, long): accumulate (u32)(curr - prev) into a 64-bit software counter; unsigned subtraction handles wrap-around transparently. - tx/rx_len[0] ([0,64] bucket): combines RUNT_CNT (32-bit, delta via tx_runt/rx_runt) and E64_CNT (64-bit, absolute) into a single assignment using a local accumulator to avoid double-counting. Clear MIB counters once in airoha_fe_init() to establish a clean baseline, preventing spurious stats from pre-driver activity (kexec, driver rebind, warm reboot). Merge airoha_dev_get_hw_stats() into airoha_update_hw_stats() and move stats_lock inside. Plain spin_lock() is correct: the function is only called from ndo_get_stats64() in process context. Each dev refreshes only its own MIB counters; sibling devs on a shared GDM3/4 port are polled when their own netdev is queried. Fixes: 8f4695fb67b2 ("net: airoha: better handle MIBs for GDM ports with multiple devs attached") Signed-off-by: Aniket Negi Acked-by: Lorenzo Bianconi --- Changes in v4: - Add max(new, old) clamping for 64-bit H+L register pairs to ensure monotonically non-decreasing stats despite torn reads between H and L - Use local variable (tmp) for all 64-bit H+L computations to prevent lockless readers from seeing intermediate values during piecewise write - Add one-shot MIB counter clear in airoha_fe_init() to establish a clean baseline (kexec, driver rebind, warm reboot) - Document sibling dev polling design in commit message Changes in v3: - Link to V2: https://lore.kernel.org/20260701173941.314795-1-aniket.negi03@gmail.com/ - Add Acked-by tag from Lorenzo - Rename from tx_runt_cnt to tx_runt, tx_long_cnt to tx_long, tx_runt_accum64 to tx_runt64 - Rename from rx_runt_cnt to rx_runt, rx_long_cnt to rx_long, rx_runt_accum64 to rx_runt64 - Condense the marked comments in V2, remove new line after comment Changes in v2: - Store _CNT_L register reads in val before adding to stats, improving readability (suggested by Lorenzo Bianconi) - Fix double-counting bug in the RUNT+E64 combined bucket: previously "+=" for E64 re-added the full absolute counter each poll; now a dedicated tx_runt_accum64/rx_runt_accum64 accumulator holds the running RUNT delta, and tx_len[0] is assigned (not accumulated) each poll as runt_accum64 + E64_abs - Replace 7-element tx_len[]/rx_len[] shadow arrays in mib_prev with focused tx_runt_cnt/tx_long_cnt and rx_runt_cnt/rx_long_cnt fields; only RUNT and LONG are 32-bit and need wrap-around tracking - Rename inner struct hw_prev_stats to mib_prev; rename accumulator fields to tx_runt_accum64/rx_runt_accum64 for clarity - Fix comment alignment in mib_prev struct block - Rename airoha_dev_get_hw_stats() to airoha_update_hw_stats() and move the port spin_lock inside, removing the separate wrapper drivers/net/ethernet/airoha/airoha_eth.c | 183 +++++++++++++++-------- drivers/net/ethernet/airoha/airoha_eth.h | 27 ++++ 2 files changed, 144 insertions(+), 66 deletions(-) diff --git a/drivers/net/ethernet/airoha/airoha_eth.c b/drivers/net/ethernet/airoha/airoha_eth.c index 59001fd4b6f7..2d032cc6dfca 100644 --- a/drivers/net/ethernet/airoha/airoha_eth.c +++ b/drivers/net/ethernet/airoha/airoha_eth.c @@ -493,6 +493,8 @@ static void airoha_fe_crsn_qsel_init(struct airoha_eth *eth) static int airoha_fe_init(struct airoha_eth *eth) { + int i; + airoha_fe_maccr_init(eth); /* PSE IQ reserve */ @@ -586,6 +588,14 @@ static int airoha_fe_init(struct airoha_eth *eth) /* enable 1:N vlan action, init vlan table */ airoha_fe_set(eth, REG_MC_VLAN_EN, MC_VLAN_EN_MASK); + /* Clear MIB counters to establish clean baseline for delta tracking. + * This prevents spurious statistics from pre-driver activity (e.g., + * kexec, driver rebind, warm reboot) on first poll. + */ + for (i = AIROHA_GDM1_IDX; i <= AIROHA_GDM4_IDX; i++) + airoha_fe_set(eth, REG_FE_GDM_MIB_CLEAR(i), + FE_GDM_MIB_RX_CLEAR_MASK | FE_GDM_MIB_TX_CLEAR_MASK); + return airoha_fe_mc_vlan_clear(eth); } @@ -1686,11 +1696,14 @@ static void airoha_qdma_stop_napi(struct airoha_qdma *qdma) } } -static void airoha_dev_get_hw_stats(struct airoha_gdm_dev *dev) +static void airoha_update_hw_stats(struct airoha_gdm_dev *dev) { struct airoha_gdm_port *port = dev->port; struct airoha_eth *eth = dev->eth; u32 val, i = 0; + u64 tmp, prev; + + spin_lock(&port->stats_lock); /* Read relevant MIB for GDM with multiple port attached */ if (port->id == AIROHA_GDM3_IDX || port->id == AIROHA_GDM4_IDX) @@ -1701,152 +1714,190 @@ static void airoha_dev_get_hw_stats(struct airoha_gdm_dev *dev) u64_stats_update_begin(&dev->stats.syncp); - /* TX */ + /* TX - 64-bit H+L registers: hw accumulates the total, read directly. + * Use local variable to prevent readers from seeing intermediate values. + * Clamp to prevent regression from torn reads between H and L. + */ + prev = dev->stats.tx_ok_pkts; val = airoha_fe_rr(eth, REG_FE_GDM_TX_OK_PKT_CNT_H(port->id)); - dev->stats.tx_ok_pkts += ((u64)val << 32); + tmp = ((u64)val << 32); val = airoha_fe_rr(eth, REG_FE_GDM_TX_OK_PKT_CNT_L(port->id)); - dev->stats.tx_ok_pkts += val; + tmp |= val; + dev->stats.tx_ok_pkts = max(tmp, prev); + prev = dev->stats.tx_ok_bytes; val = airoha_fe_rr(eth, REG_FE_GDM_TX_OK_BYTE_CNT_H(port->id)); - dev->stats.tx_ok_bytes += ((u64)val << 32); + tmp = ((u64)val << 32); val = airoha_fe_rr(eth, REG_FE_GDM_TX_OK_BYTE_CNT_L(port->id)); - dev->stats.tx_ok_bytes += val; + tmp |= val; + dev->stats.tx_ok_bytes = max(tmp, prev); + /* TX - 32-bit registers: accumulate delta to handle wrap-around. */ val = airoha_fe_rr(eth, REG_FE_GDM_TX_ETH_DROP_CNT(port->id)); - dev->stats.tx_drops += val; + dev->stats.tx_drops += (u32)(val - dev->stats.mib_prev.tx_drops); + dev->stats.mib_prev.tx_drops = val; val = airoha_fe_rr(eth, REG_FE_GDM_TX_ETH_BC_CNT(port->id)); - dev->stats.tx_broadcast += val; + dev->stats.tx_broadcast += (u32)(val - dev->stats.mib_prev.tx_broadcast); + dev->stats.mib_prev.tx_broadcast = val; val = airoha_fe_rr(eth, REG_FE_GDM_TX_ETH_MC_CNT(port->id)); - dev->stats.tx_multicast += val; + dev->stats.tx_multicast += (u32)(val - dev->stats.mib_prev.tx_multicast); + dev->stats.mib_prev.tx_multicast = val; val = airoha_fe_rr(eth, REG_FE_GDM_TX_ETH_RUNT_CNT(port->id)); - dev->stats.tx_len[i] += val; + dev->stats.mib_prev.tx_runt64 += + (u32)(val - dev->stats.mib_prev.tx_runt); + dev->stats.mib_prev.tx_runt = val; + /* tx_len[0]: RUNT (32-bit, delta) + E64 (64-bit, absolute). */ + tmp = dev->stats.mib_prev.tx_runt64; val = airoha_fe_rr(eth, REG_FE_GDM_TX_ETH_E64_CNT_H(port->id)); - dev->stats.tx_len[i] += ((u64)val << 32); + tmp += ((u64)val << 32); val = airoha_fe_rr(eth, REG_FE_GDM_TX_ETH_E64_CNT_L(port->id)); - dev->stats.tx_len[i++] += val; + tmp += val; + dev->stats.tx_len[i++] = tmp; + prev = dev->stats.tx_len[i]; val = airoha_fe_rr(eth, REG_FE_GDM_TX_ETH_L64_CNT_H(port->id)); - dev->stats.tx_len[i] += ((u64)val << 32); + tmp = ((u64)val << 32); val = airoha_fe_rr(eth, REG_FE_GDM_TX_ETH_L64_CNT_L(port->id)); - dev->stats.tx_len[i++] += val; + tmp |= val; + dev->stats.tx_len[i++] = max(tmp, prev); + prev = dev->stats.tx_len[i]; val = airoha_fe_rr(eth, REG_FE_GDM_TX_ETH_L127_CNT_H(port->id)); - dev->stats.tx_len[i] += ((u64)val << 32); + tmp = ((u64)val << 32); val = airoha_fe_rr(eth, REG_FE_GDM_TX_ETH_L127_CNT_L(port->id)); - dev->stats.tx_len[i++] += val; + tmp |= val; + dev->stats.tx_len[i++] = max(tmp, prev); + prev = dev->stats.tx_len[i]; val = airoha_fe_rr(eth, REG_FE_GDM_TX_ETH_L255_CNT_H(port->id)); - dev->stats.tx_len[i] += ((u64)val << 32); + tmp = ((u64)val << 32); val = airoha_fe_rr(eth, REG_FE_GDM_TX_ETH_L255_CNT_L(port->id)); - dev->stats.tx_len[i++] += val; + tmp |= val; + dev->stats.tx_len[i++] = max(tmp, prev); + prev = dev->stats.tx_len[i]; val = airoha_fe_rr(eth, REG_FE_GDM_TX_ETH_L511_CNT_H(port->id)); - dev->stats.tx_len[i] += ((u64)val << 32); + tmp = ((u64)val << 32); val = airoha_fe_rr(eth, REG_FE_GDM_TX_ETH_L511_CNT_L(port->id)); - dev->stats.tx_len[i++] += val; + tmp |= val; + dev->stats.tx_len[i++] = max(tmp, prev); + prev = dev->stats.tx_len[i]; val = airoha_fe_rr(eth, REG_FE_GDM_TX_ETH_L1023_CNT_H(port->id)); - dev->stats.tx_len[i] += ((u64)val << 32); + tmp = ((u64)val << 32); val = airoha_fe_rr(eth, REG_FE_GDM_TX_ETH_L1023_CNT_L(port->id)); - dev->stats.tx_len[i++] += val; + tmp |= val; + dev->stats.tx_len[i++] = max(tmp, prev); val = airoha_fe_rr(eth, REG_FE_GDM_TX_ETH_LONG_CNT(port->id)); - dev->stats.tx_len[i++] += val; + dev->stats.tx_len[i++] += (u32)(val - dev->stats.mib_prev.tx_long); + dev->stats.mib_prev.tx_long = val; /* RX */ + prev = dev->stats.rx_ok_pkts; val = airoha_fe_rr(eth, REG_FE_GDM_RX_OK_PKT_CNT_H(port->id)); - dev->stats.rx_ok_pkts += ((u64)val << 32); + tmp = ((u64)val << 32); val = airoha_fe_rr(eth, REG_FE_GDM_RX_OK_PKT_CNT_L(port->id)); - dev->stats.rx_ok_pkts += val; + tmp |= val; + dev->stats.rx_ok_pkts = max(tmp, prev); + prev = dev->stats.rx_ok_bytes; val = airoha_fe_rr(eth, REG_FE_GDM_RX_OK_BYTE_CNT_H(port->id)); - dev->stats.rx_ok_bytes += ((u64)val << 32); + tmp = ((u64)val << 32); val = airoha_fe_rr(eth, REG_FE_GDM_RX_OK_BYTE_CNT_L(port->id)); - dev->stats.rx_ok_bytes += val; + tmp |= val; + dev->stats.rx_ok_bytes = max(tmp, prev); val = airoha_fe_rr(eth, REG_FE_GDM_RX_ETH_DROP_CNT(port->id)); - dev->stats.rx_drops += val; + dev->stats.rx_drops += (u32)(val - dev->stats.mib_prev.rx_drops); + dev->stats.mib_prev.rx_drops = val; val = airoha_fe_rr(eth, REG_FE_GDM_RX_ETH_BC_CNT(port->id)); - dev->stats.rx_broadcast += val; + dev->stats.rx_broadcast += (u32)(val - dev->stats.mib_prev.rx_broadcast); + dev->stats.mib_prev.rx_broadcast = val; val = airoha_fe_rr(eth, REG_FE_GDM_RX_ETH_MC_CNT(port->id)); - dev->stats.rx_multicast += val; + dev->stats.rx_multicast += (u32)(val - dev->stats.mib_prev.rx_multicast); + dev->stats.mib_prev.rx_multicast = val; val = airoha_fe_rr(eth, REG_FE_GDM_RX_ERROR_DROP_CNT(port->id)); - dev->stats.rx_errors += val; + dev->stats.rx_errors += (u32)(val - dev->stats.mib_prev.rx_errors); + dev->stats.mib_prev.rx_errors = val; val = airoha_fe_rr(eth, REG_FE_GDM_RX_ETH_CRC_ERR_CNT(port->id)); - dev->stats.rx_crc_error += val; + dev->stats.rx_crc_error += (u32)(val - dev->stats.mib_prev.rx_crc_error); + dev->stats.mib_prev.rx_crc_error = val; val = airoha_fe_rr(eth, REG_FE_GDM_RX_OVERFLOW_DROP_CNT(port->id)); - dev->stats.rx_over_errors += val; + dev->stats.rx_over_errors += (u32)(val - dev->stats.mib_prev.rx_over_errors); + dev->stats.mib_prev.rx_over_errors = val; val = airoha_fe_rr(eth, REG_FE_GDM_RX_ETH_FRAG_CNT(port->id)); - dev->stats.rx_fragment += val; + dev->stats.rx_fragment += (u32)(val - dev->stats.mib_prev.rx_fragment); + dev->stats.mib_prev.rx_fragment = val; val = airoha_fe_rr(eth, REG_FE_GDM_RX_ETH_JABBER_CNT(port->id)); - dev->stats.rx_jabber += val; + dev->stats.rx_jabber += (u32)(val - dev->stats.mib_prev.rx_jabber); + dev->stats.mib_prev.rx_jabber = val; i = 0; val = airoha_fe_rr(eth, REG_FE_GDM_RX_ETH_RUNT_CNT(port->id)); - dev->stats.rx_len[i] += val; + dev->stats.mib_prev.rx_runt64 += + (u32)(val - dev->stats.mib_prev.rx_runt); + dev->stats.mib_prev.rx_runt = val; + /* rx_len[0]: RUNT (32-bit, delta) + E64 (64-bit, absolute). */ + tmp = dev->stats.mib_prev.rx_runt64; val = airoha_fe_rr(eth, REG_FE_GDM_RX_ETH_E64_CNT_H(port->id)); - dev->stats.rx_len[i] += ((u64)val << 32); + tmp += ((u64)val << 32); val = airoha_fe_rr(eth, REG_FE_GDM_RX_ETH_E64_CNT_L(port->id)); - dev->stats.rx_len[i++] += val; + tmp += val; + dev->stats.rx_len[i++] = tmp; + prev = dev->stats.rx_len[i]; val = airoha_fe_rr(eth, REG_FE_GDM_RX_ETH_L64_CNT_H(port->id)); - dev->stats.rx_len[i] += ((u64)val << 32); + tmp = ((u64)val << 32); val = airoha_fe_rr(eth, REG_FE_GDM_RX_ETH_L64_CNT_L(port->id)); - dev->stats.rx_len[i++] += val; + tmp |= val; + dev->stats.rx_len[i++] = max(tmp, prev); + prev = dev->stats.rx_len[i]; val = airoha_fe_rr(eth, REG_FE_GDM_RX_ETH_L127_CNT_H(port->id)); - dev->stats.rx_len[i] += ((u64)val << 32); + tmp = ((u64)val << 32); val = airoha_fe_rr(eth, REG_FE_GDM_RX_ETH_L127_CNT_L(port->id)); - dev->stats.rx_len[i++] += val; + tmp |= val; + dev->stats.rx_len[i++] = max(tmp, prev); + prev = dev->stats.rx_len[i]; val = airoha_fe_rr(eth, REG_FE_GDM_RX_ETH_L255_CNT_H(port->id)); - dev->stats.rx_len[i] += ((u64)val << 32); + tmp = ((u64)val << 32); val = airoha_fe_rr(eth, REG_FE_GDM_RX_ETH_L255_CNT_L(port->id)); - dev->stats.rx_len[i++] += val; + tmp |= val; + dev->stats.rx_len[i++] = max(tmp, prev); + prev = dev->stats.rx_len[i]; val = airoha_fe_rr(eth, REG_FE_GDM_RX_ETH_L511_CNT_H(port->id)); - dev->stats.rx_len[i] += ((u64)val << 32); + tmp = ((u64)val << 32); val = airoha_fe_rr(eth, REG_FE_GDM_RX_ETH_L511_CNT_L(port->id)); - dev->stats.rx_len[i++] += val; + tmp |= val; + dev->stats.rx_len[i++] = max(tmp, prev); + prev = dev->stats.rx_len[i]; val = airoha_fe_rr(eth, REG_FE_GDM_RX_ETH_L1023_CNT_H(port->id)); - dev->stats.rx_len[i] += ((u64)val << 32); + tmp = ((u64)val << 32); val = airoha_fe_rr(eth, REG_FE_GDM_RX_ETH_L1023_CNT_L(port->id)); - dev->stats.rx_len[i++] += val; + tmp |= val; + dev->stats.rx_len[i++] = max(tmp, prev); val = airoha_fe_rr(eth, REG_FE_GDM_RX_ETH_LONG_CNT(port->id)); - dev->stats.rx_len[i++] += val; + dev->stats.rx_len[i] += (u32)(val - dev->stats.mib_prev.rx_long); + dev->stats.mib_prev.rx_long = val; u64_stats_update_end(&dev->stats.syncp); -} - -static void airoha_update_hw_stats(struct airoha_gdm_dev *dev) -{ - struct airoha_gdm_port *port = dev->port; - int i; - - spin_lock(&port->stats_lock); - - for (i = 0; i < ARRAY_SIZE(port->devs); i++) { - if (port->devs[i]) - airoha_dev_get_hw_stats(port->devs[i]); - } - - /* Reset MIB counters */ - airoha_fe_set(dev->eth, REG_FE_GDM_MIB_CLEAR(port->id), - FE_GDM_MIB_RX_CLEAR_MASK | FE_GDM_MIB_TX_CLEAR_MASK); spin_unlock(&port->stats_lock); } diff --git a/drivers/net/ethernet/airoha/airoha_eth.h b/drivers/net/ethernet/airoha/airoha_eth.h index f6d01a8e8da1..fe934f9ffe8a 100644 --- a/drivers/net/ethernet/airoha/airoha_eth.h +++ b/drivers/net/ethernet/airoha/airoha_eth.h @@ -245,6 +245,33 @@ struct airoha_hw_stats { u64 rx_fragment; u64 rx_jabber; u64 rx_len[7]; + + struct { + /* Previous HW register values for 32-bit counter delta + * tracking. Storing the last seen value and accumulating + * (u32)(curr - prev) into the 64-bit software counter + * handles wrap-around transparently via unsigned arithmetic. + * tx_runt64/rx_runt64 hold the running sum of runt deltas. + * These fields are never reported to userspace. + */ + u32 tx_drops; + u32 tx_broadcast; + u32 tx_multicast; + u32 tx_runt; + u32 tx_long; + u64 tx_runt64; + u32 rx_drops; + u32 rx_broadcast; + u32 rx_multicast; + u32 rx_errors; + u32 rx_crc_error; + u32 rx_over_errors; + u32 rx_fragment; + u32 rx_jabber; + u32 rx_runt; + u32 rx_long; + u64 rx_runt64; + } mib_prev; }; enum { base-commit: a225f8c20712713406ae47024b8df42deacddd4a -- 2.43.0