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Miller" , Jakub Kicinski , Jesper Dangaard Brouer , John Fastabend , Eric Dumazet , Paolo Abeni , Simon Horman , Maciej Fijalkowski , Alexander Lobakin , bpf@vger.kernel.org, linux-kernel@vger.kernel.org, Bui Quang Minh Subject: [PATCH net-next v2 1/2] xsk: respect the offsets when copying frags Date: Sat, 26 Apr 2025 15:12:19 +0700 Message-ID: <20250426081220.40689-2-minhquangbui99@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250426081220.40689-1-minhquangbui99@gmail.com> References: <20250426081220.40689-1-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" In commit 560d958c6c68 ("xsk: add generic XSk &xdp_buff -> skb conversion"), we introduce a helper to convert zerocopy xdp_buff to skb. However, in the frag copy, we mistakenly ignore the frag's offset. This commit adds the missing offset when copying frags in xdp_copy_frags_from_zc(). This function is not used anywhere so no backport is needed. Signed-off-by: Bui Quang Minh --- net/core/xdp.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/net/core/xdp.c b/net/core/xdp.c index ea819764ae39..89111c68e545 100644 --- a/net/core/xdp.c +++ b/net/core/xdp.c @@ -698,7 +698,8 @@ static noinline bool xdp_copy_frags_from_zc(struct sk_b= uff *skb, nr_frags =3D xinfo->nr_frags; =20 for (u32 i =3D 0; i < nr_frags; i++) { - u32 len =3D skb_frag_size(&xinfo->frags[i]); + const skb_frag_t *frag =3D &xinfo->frags[i]; + u32 len =3D skb_frag_size(frag); u32 offset, truesize =3D len; netmem_ref netmem; =20 @@ -708,8 +709,8 @@ static noinline bool xdp_copy_frags_from_zc(struct sk_b= uff *skb, return false; } =20 - memcpy(__netmem_address(netmem), - __netmem_address(xinfo->frags[i].netmem), + memcpy(__netmem_address(netmem) + offset, + __netmem_address(frag->netmem) + skb_frag_off(frag), LARGEST_ALIGN(len)); __skb_fill_netmem_desc_noacc(sinfo, i, netmem, offset, len); =20 --=20 2.43.0