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Tsirkin" , Jason Wang , Xuan Zhuo , =?UTF-8?q?Eugenio=20P=C3=A9rez?= , Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Alexei Starovoitov , Daniel Borkmann , Jesper Dangaard Brouer , John Fastabend , virtualization@lists.linux.dev, linux-kernel@vger.kernel.org, bpf@vger.kernel.org, Bui Quang Minh Subject: [PATCH net 2/2] virtio-net: xsk: rx: move the xdp->data adjustment to buf_to_xdp() Date: Sun, 15 Jun 2025 22:13:33 +0700 Message-ID: <20250615151333.10644-3-minhquangbui99@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250615151333.10644-1-minhquangbui99@gmail.com> References: <20250615151333.10644-1-minhquangbui99@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" This commit does not do any functional changes. It moves xdp->data adjustment for buffer other than first buffer to buf_to_xdp() helper so that the xdp_buff adjustment does not scatter over different functions. Signed-off-by: Bui Quang Minh --- drivers/net/virtio_net.c | 16 ++++++++++++++-- 1 file changed, 14 insertions(+), 2 deletions(-) diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index 7c9cf5ed1827..678502aefddd 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -1167,7 +1167,19 @@ static struct xdp_buff *buf_to_xdp(struct virtnet_in= fo *vi, return NULL; } =20 - xsk_buff_set_size(xdp, len); + if (first_buf) { + xsk_buff_set_size(xdp, len); + } else { + /* This is the same as xsk_buff_set_size but with the adjusted + * xdp->data. + */ + xdp->data =3D xdp->data_hard_start + XDP_PACKET_HEADROOM; + xdp->data -=3D vi->hdr_len; + xdp->data_meta =3D xdp->data; + xdp->data_end =3D xdp->data + len; + xdp->flags =3D 0; + } + xsk_buff_dma_sync_for_cpu(xdp); =20 return xdp; @@ -1292,7 +1304,7 @@ static int xsk_append_merge_buffer(struct virtnet_inf= o *vi, goto err; } =20 - memcpy(buf, xdp->data - vi->hdr_len, len); + memcpy(buf, xdp->data, len); =20 xsk_buff_free(xdp); =20 --=20 2.43.0