Merge: igb: set max size RX buffer when store bad packet is enabled

MR: https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9/-/merge_requests/3308

JIRA: https://issues.redhat.com/browse/RHEL-15192

CVE: CVE-2023-45871

commit bb5ed01

Author: Radoslaw Tyl <[email protected]>

Date:   Thu Aug 24 13:46:19 2023 -0700

    igb: set max size RX buffer when store bad packet is enabled

    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: [email protected]
    Fixes: 89eaefb ("igb: Support RX-ALL feature flag.")
    Reported-by: Manfred Rudigier <[email protected]>
    Signed-off-by: Radoslaw Tyl <[email protected]>
    Tested-by: Arpana Arland <[email protected]> (A Contingent worker at Intel)
    Signed-off-by: Tony Nguyen <[email protected]>
    Signed-off-by: David S. Miller <[email protected]>

Signed-off-by: Wander Lairson Costa <[email protected]>

Approved-by: Michal Schmidt <[email protected]>
Approved-by: John B. Wyatt IV <[email protected]>

Signed-off-by: Jan Stancek <[email protected]>

Author: jstancek

drivers/net/ethernet/intel/igb/igb_main.c

@@ -4779,6 +4779,10 @@ 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);
@@ -4789,10 +4793,9 @@ 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
 }