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[128.93.83.149]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-48de0967a0dsm18293971f8f.3.2026.10.15.05.37.33 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 15 Oct 2026 05:37:33 -0700 (PDT) Message-ID: <69babd27-4f50-4637-9c00-e9d3efc76e0f@gmail.com> Date: Thu, 15 Oct 2026 14:37:32 +0200 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH net-next] drivers: net: xgene: Fix dma_unmap_single() size To: Daniel Machon Cc: Iyappan Subramanian , Keyur Chudgar , Quan Nguyen , Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , "open list:NETWORKING DRIVERS" , open list References: <20261014084817.41805-2-fourier.thomas@gmail.com> <20261014200253.boklssmfbnwairjy@DEN-DL-M70577.microsemi.net> Content-Language: en-US From: Thomas Fourier In-Reply-To: <20261014200253.boklssmfbnwairjy@DEN-DL-M70577.microsemi.net> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Hi Daniel, > Hi Thomas, > >> In xgene_enet_refill_pagepool(), the skb->data is dma-mapped with length > > To me, it looks like the mapping happens in xgene_enet_refill_bufpool() and not > xgene_enet_refill_pagepool().> >> len which is set to XGENE_ENET_STD_MTU which equals 1536. However, in >> xgene_enet_delete_bufpool(), the same buffer is unmapped with length >> XGENE_ENET_MAX_MTU which is 9600. This may erroneously unmap other >> DMA buffers or cause other issues. >> >> Change unmap length to XGENE_ENET_STD_MTU. >> >> Fixes: 6e434627bce2 ("drivers: net: xgene: fix: Add dma_unmap_single") > > That commit mapped and unmapped with XGENE_ENET_MAX_MTU. At that point, there > was no mismatch. I think the mismatch came with: > > Fixes: a9380b0f7be8 ("drivers: net: xgene: Add support for Jumbo frame") > >> Signed-off-by: Thomas Fourier >> --- >> drivers/net/ethernet/apm/xgene/xgene_enet_main.c | 2 +- >> 1 file changed, 1 insertion(+), 1 deletion(-) >> >> diff --git a/drivers/net/ethernet/apm/xgene/xgene_enet_main.c b/drivers/net/ethernet/apm/xgene/xgene_enet_main.c >> index 507db46daf2b..2ddcbf27014e 100644 >> --- a/drivers/net/ethernet/apm/xgene/xgene_enet_main.c >> +++ b/drivers/net/ethernet/apm/xgene/xgene_enet_main.c >> @@ -185,7 +185,7 @@ static void xgene_enet_delete_bufpool(struct xgene_enet_desc_ring *buf_pool) >> >> raw_desc = &buf_pool->raw_desc16[i]; >> dma_addr = GET_VAL(DATAADDR, le64_to_cpu(raw_desc->m1)); >> - dma_unmap_single(dev, dma_addr, XGENE_ENET_MAX_MTU, >> + dma_unmap_single(dev, dma_addr, XGENE_ENET_STD_MTU, >> DMA_FROM_DEVICE); >> } >> } >> -- >> 2.53.0 >> > > /Daniel Thank you for your comments, I agree with both, I am submitting a v2. Best, Thomas