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([2a09:bac6:37a8:ec8::179:1f4]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-43d1e4f1a99sm64678239f8f.32.2026.04.08.12.02.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 08 Apr 2026 12:02:17 -0700 (PDT) From: Matt Fleming To: Tony Nguyen , Przemek Kitszel Cc: Andrew Lunn , "David S . Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , intel-wired-lan@lists.osuosl.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-team@cloudflare.com, Matt Fleming Subject: [PATCH net] ice: Fix missing 1's complement negation in GCS raw checksum Date: Wed, 8 Apr 2026 20:02:14 +0100 Message-ID: <20260408190214.1287708-1-matt@readmodwrite.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Matt Fleming Commit 905d1a220e8d ("ice: Add E830 checksum offload support") added Generic Checksum (GCS) support for E830 NICs but omitted the 1's complement negation (~) when converting the hardware raw_csum to skb->csum for CHECKSUM_COMPLETE. Without the negation, every CHECKSUM_COMPLETE packet fails the fast-path validation in nf_ip_checksum() and falls through to software checksumming via __skb_checksum_complete(), which triggers the rate-limited "hw csum failure" warning. Packets are still accepted (the software recheck passes) but hardware checksum offload is effectively disabled and the warning floods dmesg on systems running nf_conntrack on VLAN sub-interfaces. Multiple other drivers (idpf, ehea, iwlwifi, cassini, sunhme, enetc) also apply ~ for CHECKSUM_COMPLETE. The ice driver was the only in-tree user of csum_unfold() for CHECKSUM_COMPLETE that omitted it. Fixes: 905d1a220e8d ("ice: Add E830 checksum offload support") Signed-off-by: Matt Fleming --- drivers/net/ethernet/intel/ice/ice_txrx_lib.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c index e695a664e53d..c177579e0114 100644 --- a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c +++ b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c @@ -92,7 +92,7 @@ static void ice_rx_gcs(struct sk_buff *skb, desc = (struct ice_32b_rx_flex_desc_nic *)rx_desc; skb->ip_summed = CHECKSUM_COMPLETE; csum = (__force u16)desc->raw_csum; - skb->csum = csum_unfold((__force __sum16)swab16(csum)); + skb->csum = csum_unfold((__force __sum16)~swab16(csum)); } /** -- 2.43.0