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Tsirkin" , Jason Wang , Akihiko Odaki Subject: [PATCH v2 7/7] ebpf: Fix RSS error handling Date: Tue, 10 Oct 2023 11:59:21 +0900 Message-ID: <20231010025924.14593-8-akihiko.odaki@daynix.com> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231010025924.14593-1-akihiko.odaki@daynix.com> References: <20231010025924.14593-1-akihiko.odaki@daynix.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: none client-ip=2607:f8b0:4864:20::e2d; envelope-from=akihiko.odaki@daynix.com; helo=mail-vs1-xe2d.google.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @daynix-com.20230601.gappssmtp.com) X-ZM-MESSAGEID: 1696906875692100003 Content-Type: text/plain; charset="utf-8" calculate_rss_hash() was using hash value 0 to tell if it calculated a hash, but the hash value may be 0 on a rare occasion. Have a distinct bool value for correctness. Fixes: f3fa412de2 ("ebpf: Added eBPF RSS program.") Signed-off-by: Akihiko Odaki --- tools/ebpf/rss.bpf.c | 20 +++++++++++--------- 1 file changed, 11 insertions(+), 9 deletions(-) diff --git a/tools/ebpf/rss.bpf.c b/tools/ebpf/rss.bpf.c index 20f227e2ac..667ea6899e 100644 --- a/tools/ebpf/rss.bpf.c +++ b/tools/ebpf/rss.bpf.c @@ -377,18 +377,19 @@ error: return err; } =20 -static inline __u32 calculate_rss_hash(struct __sk_buff *skb, - struct rss_config_t *config, struct toeplitz_key_data_t *toe) +static inline bool calculate_rss_hash(struct __sk_buff *skb, + struct rss_config_t *config, + struct toeplitz_key_data_t *toe, + __u32 *result) { __u8 rss_input[HASH_CALCULATION_BUFFER_SIZE] =3D {}; size_t bytes_written =3D 0; - __u32 result =3D 0; int err =3D 0; struct packet_hash_info_t packet_info =3D {}; =20 err =3D parse_packet(skb, &packet_info); if (err) { - return 0; + return false; } =20 if (packet_info.is_ipv4) { @@ -521,11 +522,13 @@ static inline __u32 calculate_rss_hash(struct __sk_bu= ff *skb, } } =20 - if (bytes_written) { - net_toeplitz_add(&result, rss_input, bytes_written, toe); + if (!bytes_written) { + return false; } =20 - return result; + net_toeplitz_add(result, rss_input, bytes_written, toe); + + return true; } =20 SEC("tun_rss_steering") @@ -546,8 +549,7 @@ int tun_rss_steering_prog(struct __sk_buff *skb) return config->default_queue; } =20 - hash =3D calculate_rss_hash(skb, config, toe); - if (hash) { + if (calculate_rss_hash(skb, config, toe, &hash)) { __u32 table_idx =3D hash % config->indirections_len; __u16 *queue =3D 0; =20 --=20 2.42.0