5.15-stable review patch. If anyone has any objections, please let me know.
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From: David Arinzon darinzon@amazon.com
[ Upstream commit 505b1a88d311ff6f8c44a34f94e3be21745cce6f ]
Current xdp code drops packets larger than ENA_XDP_MAX_MTU. This is an incorrect condition since the problem is not the size of the packet, rather the number of buffers it contains.
This commit:
1. Identifies and drops XDP multi-buffer packets at the beginning of the function. 2. Increases the xdp drop statistic when this drop occurs. 3. Adds a one-time print that such drops are happening to give better indication to the user.
Fixes: 838c93dc5449 ("net: ena: implement XDP drop support") Signed-off-by: Arthur Kiyanovski akiyano@amazon.com Signed-off-by: David Arinzon darinzon@amazon.com Link: https://lore.kernel.org/r/20231211062801.27891-3-darinzon@amazon.com Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/ethernet/amazon/ena/ena_netdev.c | 17 ++++++++++------- 1 file changed, 10 insertions(+), 7 deletions(-)
diff --git a/drivers/net/ethernet/amazon/ena/ena_netdev.c b/drivers/net/ethernet/amazon/ena/ena_netdev.c index da83580a11391..7d4b862be783d 100644 --- a/drivers/net/ethernet/amazon/ena/ena_netdev.c +++ b/drivers/net/ethernet/amazon/ena/ena_netdev.c @@ -1626,20 +1626,23 @@ static void ena_set_rx_hash(struct ena_ring *rx_ring, } }
-static int ena_xdp_handle_buff(struct ena_ring *rx_ring, struct xdp_buff *xdp) +static int ena_xdp_handle_buff(struct ena_ring *rx_ring, struct xdp_buff *xdp, u16 num_descs) { struct ena_rx_buffer *rx_info; int ret;
+ /* XDP multi-buffer packets not supported */ + if (unlikely(num_descs > 1)) { + netdev_err_once(rx_ring->adapter->netdev, + "xdp: dropped unsupported multi-buffer packets\n"); + ena_increase_stat(&rx_ring->rx_stats.xdp_drop, 1, &rx_ring->syncp); + return ENA_XDP_DROP; + } + rx_info = &rx_ring->rx_buffer_info[rx_ring->ena_bufs[0].req_id]; xdp_prepare_buff(xdp, page_address(rx_info->page), rx_info->page_offset, rx_ring->ena_bufs[0].len, false); - /* If for some reason we received a bigger packet than - * we expect, then we simply drop it - */ - if (unlikely(rx_ring->ena_bufs[0].len > ENA_XDP_MAX_MTU)) - return ENA_XDP_DROP;
ret = ena_xdp_execute(rx_ring, xdp);
@@ -1708,7 +1711,7 @@ static int ena_clean_rx_irq(struct ena_ring *rx_ring, struct napi_struct *napi, ena_rx_ctx.l4_proto, ena_rx_ctx.hash);
if (ena_xdp_present_ring(rx_ring)) - xdp_verdict = ena_xdp_handle_buff(rx_ring, &xdp); + xdp_verdict = ena_xdp_handle_buff(rx_ring, &xdp, ena_rx_ctx.descs);
/* allocate skb and fill it */ if (xdp_verdict == ENA_XDP_PASS)