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[204.195.96.226]) by smtp.gmail.com with ESMTPSA id b2-20020a637142000000b005f77b2c207dsm8592139pgn.12.2024.05.06.17.47.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 06 May 2024 17:47:09 -0700 (PDT) Date: Mon, 6 May 2024 17:47:07 -0700 From: Stephen Hemminger To: Tyler Retzlaff Cc: dev@dpdk.org, Morten =?UTF-8?B?QnLDuHJ1cA==?= , Akhil Goyal , Aman Singh , Anatoly Burakov , Andrew Rybchenko , Bruce Richardson , Chengwen Feng , Dariusz Sosnowski , Dmitry Kozlyuk , Fan Zhang , Ferruh Yigit , Harman Kalra , Harry van Haaren , Honnappa Nagarahalli , Jiayu Hu , Jingjing Wu , Kevin Laatz , Konstantin Ananyev , Matan Azrad , Ori Kam , Pallavi Kadam , Reshma Pattan , Sameh Gobriel , Suanming Mou , Thomas Monjalon , Viacheslav Ovsiienko , Vladimir Medvedkin , Volodymyr Fialko , Yipeng Wang Subject: Re: [PATCH v3 08/19] gro: remove use of VLAs for Windows built code Message-ID: <20240506174707.253a4316@hermes.local> In-Reply-To: <1715019531-22796-9-git-send-email-roretzla@linux.microsoft.com> References: <1713397319-26135-1-git-send-email-roretzla@linux.microsoft.com> <1715019531-22796-1-git-send-email-roretzla@linux.microsoft.com> <1715019531-22796-9-git-send-email-roretzla@linux.microsoft.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit 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 On Mon, 6 May 2024 11:18:40 -0700 Tyler Retzlaff wrote: > MSVC does not support VLAs, replace VLAs with standard C arrays > or alloca(). alloca() is available for all toolchain/platform > combinations officially supported by DPDK. > > Signed-off-by: Tyler Retzlaff > --- > lib/gro/rte_gro.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/lib/gro/rte_gro.c b/lib/gro/rte_gro.c > index d824eeb..0f9e85c 100644 > --- a/lib/gro/rte_gro.c > +++ b/lib/gro/rte_gro.c > @@ -179,7 +179,7 @@ struct gro_ctx { > struct gro_vxlan_udp4_item vxlan_udp_items[RTE_GRO_MAX_BURST_ITEM_NUM] > = {{{0}} }; > > - struct rte_mbuf *unprocess_pkts[nb_pkts]; > + struct rte_mbuf **unprocess_pkts = alloca(sizeof(struct rte_mbuf *) * nb_pkts); > uint32_t item_num; > int32_t ret; > uint16_t i, unprocess_num = 0, nb_after_gro = nb_pkts; > @@ -360,7 +360,7 @@ struct gro_ctx { > uint16_t nb_pkts, > void *ctx) > { > - struct rte_mbuf *unprocess_pkts[nb_pkts]; > + struct rte_mbuf **unprocess_pkts = alloca(sizeof(struct rte_mbuf *) * nb_pkts); > struct gro_ctx *gro_ctx = ctx; > void *tcp_tbl, *udp_tbl, *vxlan_tcp_tbl, *vxlan_udp_tbl, *tcp6_tbl; > uint64_t current_time; According to rte_gro.h the maximum supported burst size is #define RTE_GRO_MAX_BURST_ITEM_NUM 128U /**< the max number of packets that rte_gro_reassemble_burst() And it looks like the code already truncates at that.