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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Prashant Sreedharan Cc: horms@kernel.org, linux-kernel@vger.kernel.org, Joe Damato Subject: [RFC net v3 3/3] bnxt_en: stop DMA before releasing rings the firmware did not free Date: Wed, 23 Sep 2026 14:07:42 -0700 Message-ID: <20260923210744.3406861-4-joe@dama.to> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260923210744.3406861-1-joe@dama.to> References: <20260923210744.3406861-1-joe@dama.to> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit When HWRM_RING_FREE is not answered, bnxt_hwrm_ring_free() clears fw_ring_id and __bnxt_close_nic() goes on to call bnxt_free_mem(), which unmaps the ring memory and the RX buffers that the FW may still be using. This is reachable in production. On a BCM57504 the first sign is the TX watchdog; the close that follows times out a subset of its RING_FREEs and the driver releases those rings anyway: 05:30:12 NETDEV WATCHDOG: transmit queue 0 timed out 6073 ms 05:30:12 Resp cmpl intr err msg: 0x51 x20 05:30:12 hwrm_ring_free type 1 failed x12 05:30:12 hwrm_ring_free type 2 failed x8 05:30:12 AMD-Vi: IO_PAGE_FAULT x3 Count the rings the firmware did not free and report that to the caller so it can decide what to do. bnxt_hwrm_resource_free() still frees the remaining firmware resources before returning the error, so the shutdown can send every message it needs to before the device is stopped. The device stays unusable until a firmware reset. Fixes: 74608fc98d28 ("bnxt_en: Ring free response from close path should use completion ring") Signed-off-by: Joe Damato --- drivers/net/ethernet/broadcom/bnxt/bnxt.c | 48 +++++++++++++++++------ 1 file changed, 35 insertions(+), 13 deletions(-) diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c index a7f6facca7b4..332fb374db5e 100644 --- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c @@ -7754,21 +7754,25 @@ static void bnxt_clear_one_cp_ring(struct bnxt *bp, struct bnxt_cp_ring_info *cp memset(cpr->cp_desc_ring[i], 0, size); } -static void bnxt_hwrm_ring_free(struct bnxt *bp, bool close_path) +static int bnxt_hwrm_ring_free(struct bnxt *bp, bool close_path) { + int stuck = 0; u32 type; int i; if (!bp->bnapi) - return; + return 0; for (i = 0; i < bp->tx_nr_rings; i++) - bnxt_hwrm_tx_ring_free(bp, &bp->tx_ring[i], close_path); + if (bnxt_hwrm_tx_ring_free(bp, &bp->tx_ring[i], close_path)) + stuck++; bnxt_cancel_dim(bp); for (i = 0; i < bp->rx_nr_rings; i++) { - bnxt_hwrm_rx_ring_free(bp, &bp->rx_ring[i], close_path); - bnxt_hwrm_rx_agg_ring_free(bp, &bp->rx_ring[i], close_path); + if (bnxt_hwrm_rx_ring_free(bp, &bp->rx_ring[i], close_path)) + stuck++; + if (bnxt_hwrm_rx_agg_ring_free(bp, &bp->rx_ring[i], close_path)) + stuck++; } /* The completion rings are about to be freed. After that the @@ -7798,6 +7802,19 @@ static void bnxt_hwrm_ring_free(struct bnxt *bp, bool close_path) bp->grp_info[i].cp_fw_ring_id = INVALID_HW_RING_ID; } } + + if (!stuck) + return 0; + + netdev_err(bp->dev, "Firmware did not free %d ring(s)\n", stuck); + return -EIO; +} + +static void bnxt_stop_dma(struct bnxt *bp) +{ + netdev_err(bp->dev, + "Disabling DMA before releasing ring memory, a firmware reset is required\n"); + pci_clear_master(bp->pdev); } static int __bnxt_trim_rings(struct bnxt *bp, int *rx, int *tx, int max, @@ -10832,16 +10849,19 @@ static void bnxt_clear_vnic(struct bnxt *bp) bnxt_hwrm_vnic_ctx_free(bp); } -static void bnxt_hwrm_resource_free(struct bnxt *bp, bool close_path, - bool irq_re_init) +static int bnxt_hwrm_resource_free(struct bnxt *bp, bool close_path, + bool irq_re_init) { + int rc; + bnxt_clear_vnic(bp); - bnxt_hwrm_ring_free(bp, close_path); + rc = bnxt_hwrm_ring_free(bp, close_path); bnxt_hwrm_ring_grp_free(bp); if (irq_re_init) { bnxt_hwrm_stat_ctx_free(bp); bnxt_hwrm_free_tunnel_ports(bp); } + return rc; } static int bnxt_hwrm_set_br_mode(struct bnxt *bp, u16 br_mode) @@ -11363,15 +11383,15 @@ static int bnxt_init_chip(struct bnxt *bp, bool irq_re_init) return 0; err_out: - bnxt_hwrm_resource_free(bp, 0, true); + if (bnxt_hwrm_resource_free(bp, 0, true)) + bnxt_stop_dma(bp); return rc; } static int bnxt_shutdown_nic(struct bnxt *bp, bool irq_re_init) { - bnxt_hwrm_resource_free(bp, 1, irq_re_init); - return 0; + return bnxt_hwrm_resource_free(bp, 1, irq_re_init); } static int bnxt_init_nic(struct bnxt *bp, bool irq_re_init) @@ -13422,7 +13442,8 @@ int bnxt_half_open_nic(struct bnxt *bp) */ void bnxt_half_close_nic(struct bnxt *bp) { - bnxt_hwrm_resource_free(bp, false, true); + if (bnxt_hwrm_resource_free(bp, false, true)) + bnxt_stop_dma(bp); bnxt_del_napi(bp); bnxt_free_skbs(bp); bnxt_free_mem(bp, true); @@ -13501,7 +13522,8 @@ static void __bnxt_close_nic(struct bnxt *bp, bool irq_re_init, if (BNXT_SUPPORTS_MULTI_RSS_CTX(bp)) bnxt_clear_rss_ctxs(bp); /* Flush rings and disable interrupts */ - bnxt_shutdown_nic(bp, irq_re_init); + if (bnxt_shutdown_nic(bp, irq_re_init)) + bnxt_stop_dma(bp); /* TODO CHIMP_FW: Link/PHY related cleanup if (link_re_init) */ -- 2.53.0-Meta