This is a note to let you know that I've just added the patch titled i40e: Fix sparse errors in i40e_txrx.c to the 5.11-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: i40e-fix-sparse-errors-in-i40e_txrx.c.patch and it can be found in the queue-5.11 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 12738ac4754ec92a6a45bf3677d8da780a1412b3 Mon Sep 17 00:00:00 2001 From: Arkadiusz Kubalewski <arkadiusz.kubalewski@xxxxxxxxx> Date: Fri, 26 Mar 2021 19:43:40 +0100 Subject: i40e: Fix sparse errors in i40e_txrx.c From: Arkadiusz Kubalewski <arkadiusz.kubalewski@xxxxxxxxx> commit 12738ac4754ec92a6a45bf3677d8da780a1412b3 upstream. Remove error handling through pointers. Instead use plain int to return value from i40e_run_xdp(...). Previously: - sparse errors were produced during compilation: i40e_txrx.c:2338 i40e_run_xdp() error: (-2147483647) too low for ERR_PTR i40e_txrx.c:2558 i40e_clean_rx_irq() error: 'skb' dereferencing possible ERR_PTR() - sk_buff* was used to return value, but it has never had valid pointer to sk_buff. Returned value was always int handled as a pointer. Fixes: 0c8493d90b6b ("i40e: add XDP support for pass and drop actions") Fixes: 2e6893123830 ("i40e: split XDP_TX tail and XDP_REDIRECT map flushing") Signed-off-by: Aleksandr Loktionov <aleksandr.loktionov@xxxxxxxxx> Signed-off-by: Arkadiusz Kubalewski <arkadiusz.kubalewski@xxxxxxxxx> Tested-by: Dave Switzer <david.switzer@xxxxxxxxx> Signed-off-by: Tony Nguyen <anthony.l.nguyen@xxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/net/ethernet/intel/i40e/i40e_txrx.c | 12 +++++------- 1 file changed, 5 insertions(+), 7 deletions(-) --- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c +++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c @@ -2198,8 +2198,7 @@ int i40e_xmit_xdp_tx_ring(struct xdp_buf * @rx_ring: Rx ring being processed * @xdp: XDP buffer containing the frame **/ -static struct sk_buff *i40e_run_xdp(struct i40e_ring *rx_ring, - struct xdp_buff *xdp) +static int i40e_run_xdp(struct i40e_ring *rx_ring, struct xdp_buff *xdp) { int err, result = I40E_XDP_PASS; struct i40e_ring *xdp_ring; @@ -2238,7 +2237,7 @@ static struct sk_buff *i40e_run_xdp(stru } xdp_out: rcu_read_unlock(); - return ERR_PTR(-result); + return result; } /** @@ -2350,6 +2349,7 @@ static int i40e_clean_rx_irq(struct i40e unsigned int xdp_xmit = 0; bool failure = false; struct xdp_buff xdp; + int xdp_res = 0; #if (PAGE_SIZE < 8192) xdp.frame_sz = i40e_rx_frame_truesize(rx_ring, 0); @@ -2416,12 +2416,10 @@ static int i40e_clean_rx_irq(struct i40e /* At larger PAGE_SIZE, frame_sz depend on len size */ xdp.frame_sz = i40e_rx_frame_truesize(rx_ring, size); #endif - skb = i40e_run_xdp(rx_ring, &xdp); + xdp_res = i40e_run_xdp(rx_ring, &xdp); } - if (IS_ERR(skb)) { - unsigned int xdp_res = -PTR_ERR(skb); - + if (xdp_res) { if (xdp_res & (I40E_XDP_TX | I40E_XDP_REDIR)) { xdp_xmit |= xdp_res; i40e_rx_buffer_flip(rx_ring, rx_buffer, size); Patches currently in stable-queue which might be from arkadiusz.kubalewski@xxxxxxxxx are queue-5.11/i40e-fix-sparse-errors-in-i40e_txrx.c.patch queue-5.11/i40e-fix-sparse-warning-missing-error-code-err.patch queue-5.11/i40e-fix-sparse-error-vsi-netdev-could-be-null.patch queue-5.11/i40e-fix-sparse-error-uninitialized-symbol-ring.patch