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Tue, 22 Sep 2026 12:53:39 -0700 (PDT) From: Daniel Zahka Date: Tue, 22 Sep 2026 12:53:28 -0700 Subject: [PATCH net-next] eth: fbnic: put back netmem reference xdp_buff_add_frag() fails Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260922-fbnic-refcount-fix-v1-1-31e5862c9893@gmail.com> X-B4-Tracking: v=1; b=H4sIALfcsmoC/x2MywqAIBAAfyX23EIZPX8lOqittZct1EKI/j3pO AwzDwTyTAGm4gFPNwc+JENdFmB3LRshr5lBVaqrRqXQGWGLnpw9LonoOKHuB9PontqmM5DDM1t O/3QGoYhCKcLyvh95Vav4bgAAAA== To: Alexander Duyck , Jakub Kicinski , kernel-team@meta.com, Andrew Lunn , "David S. Miller" , Eric Dumazet , Paolo Abeni , Alexei Starovoitov , Daniel Borkmann , Jesper Dangaard Brouer , John Fastabend , Stanislav Fomichev Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, bpf@vger.kernel.org X-Mailer: b4 0.13.0 fbnic_add_rx_frag() takes a page_pool reference out of the buffer's pagecnt_bias before handing the fragment to xdp_buff_add_frag(). If that call fails it has not taken ownership of the netmem: the fragment is not recorded in the shared info, and fbnic_put_pkt_buff() will not put the reference back. Put the netmem reference back on the failure path. Signed-off-by: Daniel Zahka --- This error path was introduced in commit 61f9a066c309 ("eth: fbnic: Use shinfo to track frags state on Rx"). This is not a fix though, because the branch is unreachable if the device is behaving correctly. --- drivers/net/ethernet/meta/fbnic/fbnic_txrx.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/net/ethernet/meta/fbnic/fbnic_txrx.c b/drivers/net/ethernet/meta/fbnic/fbnic_txrx.c index 447ec5522499..bbc3c9e89a38 100644 --- a/drivers/net/ethernet/meta/fbnic/fbnic_txrx.c +++ b/drivers/net/ethernet/meta/fbnic/fbnic_txrx.c @@ -1045,6 +1045,7 @@ static void fbnic_add_rx_frag(struct fbnic_napi_vector *nv, u64 rcd, pkt->add_frag_failed = true; netdev_err_once(nv->napi.dev, "Failed to add fragment to xdp_buff\n"); + page_pool_put_full_netmem(qt->sub1.page_pool, netmem, true); } } --- base-commit: 6598456d72e48d779445bfec8f72114747f8b8d7 change-id: 20260922-fbnic-refcount-fix-a78b3a7e536b Best regards, -- Daniel Zahka