[SRU Focal, Jammy, OEM-6.0, Lunar 1/1] igb: set max size RX buffer when store bad packet is enabled

[Cengiz Can]

From: Radoslaw Tyl <radoslawx.tyl at 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.

Cc: stable at vger.kernel.org
Fixes: 89eaefb61dc9 ("igb: Support RX-ALL feature flag.")
Reported-by: Manfred Rudigier <manfred.rudigier at omicronenergy.com>
Signed-off-by: Radoslaw Tyl <radoslawx.tyl at intel.com>
Tested-by: Arpana Arland <arpanax.arland at intel.com> (A Contingent worker at Intel)
Signed-off-by: Tony Nguyen <anthony.l.nguyen at intel.com>
Signed-off-by: David S. Miller <davem at davemloft.net>
(cherry picked from commit bb5ed01cd2428cd25b1c88a3a9cba87055eb289f)
CVE-2023-45871
Signed-off-by: Cengiz Can <cengiz.can at canonical.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 6f2e9c606e4b..4dcb27d2f74d 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -4758,6 +4758,10 @@ 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);
@@ -4768,10 +4772,9 @@ 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
 }
 
-- 
2.39.2