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The buffer is therefore freed twice. It gets reused for > another Rx descriptor, the second free puts an in-use buffer back on > the pool free list, and the same UMEM frame is later handed to user > space twice. Did you verify this or is this rather a speculation? xp_free() protects against double-free cases. > On mlx5 with striding RQ this also ended in a NULL pointer > dereference in mlx5e_post_rx_wqes(). Please more info on this then. > > Leave the buffer with the caller on both the single-buffer and the > multi-buffer -ENOBUFS paths, as xsk_rcv() and xsk_rcv_check() already > do. i40e and ice relied on the core freeing the buffer on their > need_wakeup -ENOBUFS (XDP_EXIT) path, so make them free it there. > > Seen on Mellanox ConnectX-6 DX MT2892 (FW 22.47.1026) with AF_XDP > zero-copy on 7.3.0-rc6 when the user-space consumer could not keep up > with the Rx ring. With this change no duplicate frames were seen with > striding RQ on or off. Have you thought about massaging mlx driver instead of intel + core? Even when that would be correct approach ixgbe would miss being addressed. > > Fixes: 269009893146 ("xsk: recycle buffer in case Rx queue was full") > Signed-off-by: Marcin Knap > --- > Tested on mlx5 (ConnectX-6 DX) in zero-copy single-buffer mode. > The i40e and ice changes and the multi-buffer path are build-tested > only, as I don't have that hardware available. > --- > drivers/net/ethernet/intel/i40e/i40e_xsk.c | 1 + > drivers/net/ethernet/intel/ice/ice_xsk.c | 1 + > net/xdp/xsk.c | 15 +++------------ > 3 files changed, 5 insertions(+), 12 deletions(-) > > diff --git a/drivers/net/ethernet/intel/i40e/i40e_xsk.c b/drivers/net/ethernet/intel/i40e/i40e_xsk.c > index 9f47388eaba5..d32c7255f0b3 100644 > --- a/drivers/net/ethernet/intel/i40e/i40e_xsk.c > +++ b/drivers/net/ethernet/intel/i40e/i40e_xsk.c > @@ -358,6 +358,7 @@ static void i40e_handle_xdp_result_zc(struct i40e_ring *rx_ring, > return; > > if (xdp_res == I40E_XDP_EXIT) { > + xsk_buff_free(xdp_buff); > *failure = true; > return; > } > diff --git a/drivers/net/ethernet/intel/ice/ice_xsk.c b/drivers/net/ethernet/intel/ice/ice_xsk.c > index 0643017541c3..7c1dd4c87a71 100644 > --- a/drivers/net/ethernet/intel/ice/ice_xsk.c > +++ b/drivers/net/ethernet/intel/ice/ice_xsk.c > @@ -636,6 +636,7 @@ int ice_clean_rx_irq_zc(struct ice_rx_ring *rx_ring, > if (likely(xdp_res & (ICE_XDP_TX | ICE_XDP_REDIR))) { > xdp_xmit |= xdp_res; > } else if (xdp_res == ICE_XDP_EXIT) { > + xsk_buff_free(first); > failure = true; > first = NULL; > break; > diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c > index 33475b180ea6..0edc160c660f 100644 > --- a/net/xdp/xsk.c > +++ b/net/xdp/xsk.c > @@ -224,21 +224,15 @@ static int xsk_rcv_zc(struct xdp_sock *xs, struct xdp_buff *xdp, u32 len) > struct list_head *xskb_list; > u32 contd = 0; > u32 num_desc; > - int err; > > - if (likely(!frags)) { > - err = __xsk_rcv_zc(xs, xskb, len, contd); > - if (err) > - goto err; > - return 0; > - } > + if (likely(!frags)) > + return __xsk_rcv_zc(xs, xskb, len, contd); > > contd = XDP_PKT_CONTD; > num_desc = xdp_get_shared_info_from_buff(xdp)->nr_frags + 1; > if (xskq_prod_nb_free(xs->rx, num_desc) < num_desc) { > xs->rx_queue_full++; > - err = -ENOBUFS; > - goto err; > + return -ENOBUFS; > } > > __xsk_rcv_zc_safe(xs, xskb, len, contd); > @@ -252,9 +246,6 @@ static int xsk_rcv_zc(struct xdp_sock *xs, struct xdp_buff *xdp, u32 len) > } > > return 0; > -err: > - xsk_buff_free(xdp); > - return err; > } > > static void *xsk_copy_xdp_start(struct xdp_buff *from) > > --- > base-commit: ff47652a4b66c067c765a7ad464d930b5a9367cc > change-id: 20261019-xsk-zc-rx-double-free-1a3b059cd41f > > Best regards, > -- > Marcin Knap > >