linux-kernel - Re: [PATCH net] net: atlantic: Fix DMA mapping for PTP hwts ring

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Date: Thu, 1 Feb 2024 13:39:03 +0100
From: Jiri Pirko <jiri@...nulli.us>
To: Ivan Vecera <ivecera@...hat.com>
Cc: netdev@...r.kernel.org, Egor Pomozov <epomozov@...vell.com>,
	Igor Russkikh <irusskikh@...vell.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Richard Cochran <richardcochran@...il.com>,
	Dmitry Bezrukov <dmitry.bezrukov@...antia.com>,
	Sergey Samoilenko <sergey.samoilenko@...antia.com>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net] net: atlantic: Fix DMA mapping for PTP hwts ring

Thu, Feb 01, 2024 at 10:47:51AM CET, ivecera@...hat.com wrote:
>Function aq_ring_hwts_rx_alloc() maps extra AQ_CFG_RXDS_DEF bytes
>for PTP HWTS ring but then generic aq_ring_free() does not take this
>into account.
>Create and use a specific function to free HWTS ring to fix this
>issue.
>
>Trace:
>[  215.351607] ------------[ cut here ]------------
>[  215.351612] DMA-API: atlantic 0000:4b:00.0: device driver frees DMA memory with different size [device address=0x00000000fbdd0000] [map size=34816 bytes] [unmap size=32768 bytes]
>[  215.351635] WARNING: CPU: 33 PID: 10759 at kernel/dma/debug.c:988 check_unmap+0xa6f/0x2360
>...
>[  215.581176] Call Trace:
>[  215.583632]  <TASK>
>[  215.585745]  ? show_trace_log_lvl+0x1c4/0x2df
>[  215.590114]  ? show_trace_log_lvl+0x1c4/0x2df
>[  215.594497]  ? debug_dma_free_coherent+0x196/0x210
>[  215.599305]  ? check_unmap+0xa6f/0x2360
>[  215.603147]  ? __warn+0xca/0x1d0
>[  215.606391]  ? check_unmap+0xa6f/0x2360
>[  215.610237]  ? report_bug+0x1ef/0x370
>[  215.613921]  ? handle_bug+0x3c/0x70
>[  215.617423]  ? exc_invalid_op+0x14/0x50
>[  215.621269]  ? asm_exc_invalid_op+0x16/0x20
>[  215.625480]  ? check_unmap+0xa6f/0x2360
>[  215.629331]  ? mark_lock.part.0+0xca/0xa40
>[  215.633445]  debug_dma_free_coherent+0x196/0x210
>[  215.638079]  ? __pfx_debug_dma_free_coherent+0x10/0x10
>[  215.643242]  ? slab_free_freelist_hook+0x11d/0x1d0
>[  215.648060]  dma_free_attrs+0x6d/0x130
>[  215.651834]  aq_ring_free+0x193/0x290 [atlantic]
>[  215.656487]  aq_ptp_ring_free+0x67/0x110 [atlantic]
>...
>[  216.127540] ---[ end trace 6467e5964dd2640b ]---
>[  216.132160] DMA-API: Mapped at:
>[  216.132162]  debug_dma_alloc_coherent+0x66/0x2f0
>[  216.132165]  dma_alloc_attrs+0xf5/0x1b0
>[  216.132168]  aq_ring_hwts_rx_alloc+0x150/0x1f0 [atlantic]
>[  216.132193]  aq_ptp_ring_alloc+0x1bb/0x540 [atlantic]
>[  216.132213]  aq_nic_init+0x4a1/0x760 [atlantic]
>
>Fixes: 94ad94558b0f ("net: aquantia: add PTP rings infrastructure")
>Signed-off-by: Ivan Vecera <ivecera@...hat.com>

Reviewed-by: Jiri Pirko <jiri@...dia.com>