On 12/7/2022 10:25 AM, Saeed Mahameed wrote:
On 07 Dec 10:08, Tony Nguyen wrote:
From: Bartosz Staszewski <bartoszx.staszewski@xxxxxxxxx>
Whenever trying to load XDP prog on downed interface, function i40e_xdp
was passing vsi->rx_buf_len field to i40e_xdp_setup() which was equal 0.
i40e_open() calls i40e_vsi_configure_rx() which configures that field,
but that only happens when interface is up. When it is down, i40e_open()
is not being called, thus vsi->rx_buf_len is not set.
Solution for this is calculate buffer length in newly created
function - i40e_calculate_vsi_rx_buf_len() that return actual buffer
length. Buffer length is being calculated based on the same rules
applied previously in i40e_vsi_configure_rx() function.
Fixes: 613142b0bb88 ("i40e: Log error for oversized MTU on device")
Fixes: 0c8493d90b6b ("i40e: add XDP support for pass and drop actions")
Signed-off-by: Bartosz Staszewski <bartoszx.staszewski@xxxxxxxxx>
Signed-off-by: Mateusz Palczewski <mateusz.palczewski@xxxxxxxxx>
Tested-by: Shwetha Nagaraju <Shwetha.nagaraju@xxxxxxxxx>
Reviewed-by: Maciej Fijalkowski <maciej.fijalkowski@xxxxxxxxx>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@xxxxxxxxx>
---
v2:
- Change title and rework commit message
- Dropped, previous, patch 1
v1:
https://lore.kernel.org/netdev/20221115000324.3040207-1-anthony.l.nguyen@xxxxxxxxx/
drivers/net/ethernet/intel/i40e/i40e_main.c | 42 +++++++++++++++------
1 file changed, 30 insertions(+), 12 deletions(-)
diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c
b/drivers/net/ethernet/intel/i40e/i40e_main.c
index 6416322d7c18..b8a8098110eb 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -3693,6 +3693,30 @@ static int i40e_vsi_configure_tx(struct
i40e_vsi *vsi)
return err;
}
+/**
+ * i40e_calculate_vsi_rx_buf_len - Calculates buffer length
+ *
+ * @vsi: VSI to calculate rx_buf_len from
+ */
+static u16 i40e_calculate_vsi_rx_buf_len(struct i40e_vsi *vsi)
+{
+ u16 ret;
+
+ if (!vsi->netdev || (vsi->back->flags & I40E_FLAG_LEGACY_RX)) {
+ ret = I40E_RXBUFFER_2048;
+#if (PAGE_SIZE < 8192)
+ } else if (!I40E_2K_TOO_SMALL_WITH_PADDING &&
+ (vsi->netdev->mtu <= ETH_DATA_LEN)) {
+ ret = I40E_RXBUFFER_1536 - NET_IP_ALIGN;
+#endif
+ } else {
+ ret = (PAGE_SIZE < 8192) ? I40E_RXBUFFER_3072 :
+ I40E_RXBUFFER_2048;
+ }
+
+ return ret;
+}
nit: linux coding style states:
"Do not unnecessarily use braces where a single statement will do"
I think this applies here.
Also you could simplify this function to do early returns and drop the u16
ret variable and all the else statements.
if (condition 1)
return val1;
if (condition 2)
return val2;
return val3;
Other than that LGTM.
Thanks for the review. Will make these adjustments in next version.
