netdev - [PATCH v4 bpf 08/11] ice: update xdp_rxq_info::frag

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Date: Sat, 20 Jan 2024 00:30:34 +0100
From: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
To: bpf@...r.kernel.org,
	ast@...nel.org,
	daniel@...earbox.net,
	andrii@...nel.org
Cc: netdev@...r.kernel.org,
	magnus.karlsson@...el.com,
	bjorn@...nel.org,
	maciej.fijalkowski@...el.com,
	echaudro@...hat.com,
	lorenzo@...nel.org,
	martin.lau@...ux.dev,
	tirthendu.sarkar@...el.com,
	john.fastabend@...il.com
Subject: [PATCH v4 bpf 08/11] ice: update xdp_rxq_info::frag_size for ZC enabled Rx queue

Now that ice driver correctly sets up frag_size in xdp_rxq_info, let us
make it work for ZC multi-buffer as well. ice_rx_ring::rx_buf_len for ZC
is being set via xsk_pool_get_rx_frame_size() and this needs to be
propagated up to xdp_rxq_info.

Use a bigger hammer and instead of unregistering only xdp_rxq_info's
memory model, unregister it altogether and register it again and have
xdp_rxq_info with correct frag_size value.

Fixes: 1bbc04de607b ("ice: xsk: add RX multi-buffer support")
Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
---
 drivers/net/ethernet/intel/ice/ice_base.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_base.c b/drivers/net/ethernet/intel/ice/ice_base.c
index b25b7f415965..df174c1c3817 100644
--- a/drivers/net/ethernet/intel/ice/ice_base.c
+++ b/drivers/net/ethernet/intel/ice/ice_base.c
@@ -564,10 +564,15 @@ int ice_vsi_cfg_rxq(struct ice_rx_ring *ring)
 
 		ring->xsk_pool = ice_xsk_pool(ring);
 		if (ring->xsk_pool) {
-			xdp_rxq_info_unreg_mem_model(&ring->xdp_rxq);
+			xdp_rxq_info_unreg(&ring->xdp_rxq);
 
 			ring->rx_buf_len =
 				xsk_pool_get_rx_frame_size(ring->xsk_pool);
+			/* coverity[check_return] */
+			__xdp_rxq_info_reg(&ring->xdp_rxq, ring->netdev,
+					   ring->q_index,
+					   ring->q_vector->napi.napi_id,
+					   ring->rx_buf_len);
 			err = xdp_rxq_info_reg_mem_model(&ring->xdp_rxq,
 							 MEM_TYPE_XSK_BUFF_POOL,
 							 NULL);
-- 
2.34.1