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Wed, 30 Oct 2024 04:21:12 -0700 (PDT) X-Google-Smtp-Source: AGHT+IGyJGKk3I+iNG+A7Nwvdg7VU2yAzLk5xa8BcrIOwVKaY9ZKOhvqMrQ2jhCoA9/aCOCKEPsYTRtIjKQE/d26Uuw= X-Received: by 2002:a05:651c:1545:b0:2fb:4ddd:a8f0 with SMTP id 38308e7fff4ca-2fcbdf728d4mr68335871fa.15.1730287272170; Wed, 30 Oct 2024 04:21:12 -0700 (PDT) MIME-Version: 1.0 References: <20241017142214.1669370-1-bruce.richardson@intel.com> <20241025165020.1856733-1-bruce.richardson@intel.com> <20241025165020.1856733-6-bruce.richardson@intel.com> In-Reply-To: <20241025165020.1856733-6-bruce.richardson@intel.com> From: David Marchand Date: Wed, 30 Oct 2024 12:21:00 +0100 Message-ID: Subject: Re: [PATCH v2 5/6] net: add smaller IPv4 cksum function for simple cases To: Bruce Richardson Cc: dev@dpdk.org, Stephen Hemminger , =?UTF-8?Q?Morten_Br=C3=B8rup?= , Jerin Jacob , Aman Singh , Konstantin Ananyev X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Hello Bruce, On Fri, Oct 25, 2024 at 6:51=E2=80=AFPM Bruce Richardson wrote: > > There are multiple instances in the DPDK app folder where we set up an > IP header and then compute the checksum field by direct addition of > nine uint16_t values in the header (20 bytes less the cksum field). > The existing rte_ip.h checksum function is more general than necessary > here and requires that the checksum field is already set to zero - > rather than having it skipped. > > Fix the code duplication present in the apps by creating a new > rte_ipv4_cksum_simple function - taking the code from the existing > testpmd icmpecho.c file - and using that in app/test, testpmd and > testeventdev. > > Within that new function, we can adjust slightly how the typecasting to > uint16_t is done, and thereby ensure that the app can all be compiled > without -Wno-address-of-packed-member compiler flag. > > Signed-off-by: Bruce Richardson > Acked-by: Stephen Hemminger > Acked-by: Morten Br=C3=B8rup This added function triggers a build error with OVS because of -Wcast-align= : https://github.com/david-marchand/ovs/actions/runs/11401635820/job/32273090= 691#step:12:514 libtool: compile: env REAL_CC=3Dgcc "CHECK=3Dsparse -Wsparse-error -I ./include/sparse -I ./include -m64 -I /usr/local/include -I /usr/include/x86_64-linux-gnu " cgcc -target=3Dx86_64 -target=3Dhost_os_specs -D__MMX__=3D1 -D__MMX_WITH_SSE__=3D1 -D__SSE2_MATH__=3D1 -D__SSE_MATH__=3D1 -D__SSE__=3D1 -D__SSE2__=3D1 -DHAVE_CONFIG_H -I. -I ./include -I ./include -I ./lib -I ./lib -Wstrict-prototypes -Wall -Wextra -Wno-sign-compare -Wpointer-arith -Wformat -Wformat-security -Wswitch-enum -Wunused-parameter -Wbad-function-cast -Wcast-align -Wstrict-prototypes -Wold-style-definition -Wmissing-prototypes -Wmissing-field-initializers -fno-strict-aliasing -Wswitch-bool -Wlogical-not-parentheses -Wsizeof-array-argument -Wbool-compare -Wshift-negative-value -Wduplicated-cond -Wshadow -Wmultistatement-macros -Wcast-align=3Dstrict -mssse3 -I/home/runner/work/ovs/ovs/dpdk-dir/include -include rte_config.h -mrtm -Werror -D_FILE_OFFSET_BITS=3D64 -g -O2 -MT lib/ofp-protocol.lo -MD -MP -MF lib/.deps/ofp-protocol.Tpo -c lib/ofp-protocol.c -o lib/ofp-protocol.o In file included from /home/runner/work/ovs/ovs/dpdk-dir/include/rte_ip.h:9= , from /home/runner/work/ovs/ovs/dpdk-dir/include/rte_flow.h:25, from lib/netdev-dpdk.h:30, from lib/dp-packet.h:30, from lib/ofp-print.c:34: /home/runner/work/ovs/ovs/dpdk-dir/include/rte_ip4.h: In function =E2=80=98rte_ipv4_cksum_simple=E2=80=99: /home/runner/work/ovs/ovs/dpdk-dir/include/rte_ip4.h:191:17: error: cast increases required alignment of target type [-Werror=3Dcast-align] 191 | v16_h =3D (const unaligned_uint16_t *)&ipv4_hdr->version_ihl; | ^ cc1: all warnings being treated as errors make[1]: *** [Makefile:4736: lib/ofp-packet.lo] Error 1 make[1]: *** Waiting for unfinished jobs.... cc1: all warnings being treated as errors make[1]: *** [Makefile:4736: lib/ofp-print.lo] Error 1 make[1]: Leaving directory '/home/runner/work/ovs/ovs' make: *** [Makefile:3110: all] Error 2 --=20 David Marchand