From: Tony Nguyen
Sent: 24 August 2023 21:46
From: Radoslaw Tyl radoslawx.tyl@intel.com
Increase the RX buffer size to 3K when the SBP bit is on. The size of the RX buffer determines the number of pages allocated which may not be sufficient for receive frames larger than the set MTU size.
How much does that actually help? In principle there is no limit to the length of an ethernet frame. So the code has to handle overlong packets whatever the receive buffer size is set to.
Modern ethernet hardware probably has configurable rx frame length limits - but with old hardware the drivers had to handle frames longer than 'buffer_size * ring_size'.
David
Cc: stable@vger.kernel.org Fixes: 89eaefb61dc9 ("igb: Support RX-ALL feature flag.") Reported-by: Manfred Rudigier manfred.rudigier@omicronenergy.com Signed-off-by: Radoslaw Tyl radoslawx.tyl@intel.com Tested-by: Arpana Arland arpanax.arland@intel.com (A Contingent worker at Intel) Signed-off-by: Tony Nguyen anthony.l.nguyen@intel.com
drivers/net/ethernet/intel/igb/igb_main.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-)
diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c index 9a2561409b06..08e3df37089f 100644 --- a/drivers/net/ethernet/intel/igb/igb_main.c +++ b/drivers/net/ethernet/intel/igb/igb_main.c @@ -4814,6 +4814,10 @@ void igb_configure_rx_ring(struct igb_adapter *adapter, static void igb_set_rx_buffer_len(struct igb_adapter *adapter, struct igb_ring *rx_ring) { +#if (PAGE_SIZE < 8192)
- struct e1000_hw *hw = &adapter->hw;
+#endif
- /* set build_skb and buffer size flags */ clear_ring_build_skb_enabled(rx_ring); clear_ring_uses_large_buffer(rx_ring);
@@ -4824,10 +4828,9 @@ static void igb_set_rx_buffer_len(struct igb_adapter *adapter, set_ring_build_skb_enabled(rx_ring);
#if (PAGE_SIZE < 8192)
- if (adapter->max_frame_size <= IGB_MAX_FRAME_BUILD_SKB)
return;- set_ring_uses_large_buffer(rx_ring);
- if (adapter->max_frame_size > IGB_MAX_FRAME_BUILD_SKB ||
rd32(E1000_RCTL) & E1000_RCTL_SBP)set_ring_uses_large_buffer(rx_ring);#endif }
-- 2.38.1
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