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bh=Y6LypCmlc48uGr2Rv+a4xfYK5lEqailGG9L9qoIYFCo=; b=chHgHjslTr6o+w6bVXSsWuSU3PF2vVzuYKmmA1PyjFA0X6qqcKIG353K8XiZZhM9dANytt mpY7tYS7e1xthugQCBrz7ByFPLgCMX9RilKaWcJEePuMSyNLX6G/Si2LwLSH+eYy1AsZjn /dqrfUMFFSpkEn5UeXcqLO15hqVZ8xM= X-MC-Unique: vPfVuPv3NVCLrIJDU5T7Ew-1 From: Jason Wang To: qemu-devel@nongnu.org, peter.maydell@linaro.org Subject: [PULL 01/13] net: eth: Add a helper to pad a short Ethernet frame Date: Mon, 22 Mar 2021 18:08:00 +0800 Message-Id: <1616407692-693-2-git-send-email-jasowang@redhat.com> In-Reply-To: <1616407692-693-1-git-send-email-jasowang@redhat.com> References: <1616407692-693-1-git-send-email-jasowang@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=jasowang@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset="utf-8" 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: pass client-ip=216.205.24.124; envelope-from=jasowang@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Jason Wang , Bin Meng Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) From: Bin Meng Add a helper to pad a short Ethernet frame to the minimum required length, which can be used by backends' code. Signed-off-by: Bin Meng Reviewed-by: Philippe Mathieu-Daud=C3=A9 Signed-off-by: Jason Wang --- include/net/eth.h | 17 +++++++++++++++++ net/eth.c | 17 +++++++++++++++++ 2 files changed, 34 insertions(+) diff --git a/include/net/eth.h b/include/net/eth.h index 0671be6..7767ae8 100644 --- a/include/net/eth.h +++ b/include/net/eth.h @@ -31,6 +31,7 @@ =20 #define ETH_ALEN 6 #define ETH_HLEN 14 +#define ETH_ZLEN 60 /* Min. octets in frame without FCS */ =20 struct eth_header { uint8_t h_dest[ETH_ALEN]; /* destination eth addr */ @@ -422,4 +423,20 @@ bool eth_parse_ipv6_hdr(const struct iovec *pkt, int pkt_frags, size_t ip6hdr_off, eth_ip6_hdr_info *info); =20 +/** + * eth_pad_short_frame - pad a short frame to the minimum Ethernet frame l= ength + * + * If the Ethernet frame size is shorter than 60 bytes, it will be padded = to + * 60 bytes at the address @padded_pkt. + * + * @padded_pkt: buffer address to hold the padded frame + * @padded_buflen: pointer holding length of @padded_pkt. If the frame is + * padded, the length will be updated to the padded one. + * @pkt: address to hold the original Ethernet frame + * @pkt_size: size of the original Ethernet frame + * @return true if the frame is padded, otherwise false + */ +bool eth_pad_short_frame(uint8_t *padded_pkt, size_t *padded_buflen, + const void *pkt, size_t pkt_size); + #endif diff --git a/net/eth.c b/net/eth.c index 1e0821c..f913e43 100644 --- a/net/eth.c +++ b/net/eth.c @@ -548,3 +548,20 @@ bool eth_parse_ipv6_hdr(const struct iovec *pkt, int p= kt_frags, info->l4proto =3D ext_hdr.ip6r_nxt; return true; } + +bool eth_pad_short_frame(uint8_t *padded_pkt, size_t *padded_buflen, + const void *pkt, size_t pkt_size) +{ + assert(padded_buflen && *padded_buflen >=3D ETH_ZLEN); + + if (pkt_size >=3D ETH_ZLEN) { + return false; + } + + /* pad to minimum Ethernet frame length */ + memcpy(padded_pkt, pkt, pkt_size); + memset(&padded_pkt[pkt_size], 0, ETH_ZLEN - pkt_size); + *padded_buflen =3D ETH_ZLEN; + + return true; +} --=20 2.7.4