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From: Jason Xing <kerneljasonxing@gmail.com>
To: alexander.duyck@gmail.com, jesse.brandeburg@intel.com,
	anthony.l.nguyen@intel.com, davem@davemloft.net,
	edumazet@google.com, kuba@kernel.org, pabeni@redhat.com,
	richardcochran@gmail.com, ast@kernel.org, daniel@iogearbox.net,
	hawk@kernel.org, john.fastabend@gmail.com,
	alexandr.lobakin@intel.com, maciej.fijalkowski@intel.com
Cc: kerneljasonxing@gmail.com, netdev@vger.kernel.org,
	Alexander Duyck <alexanderduyck@fb.com>,
	linux-kernel@vger.kernel.org, intel-wired-lan@lists.osuosl.org,
	bpf@vger.kernel.org, Jason Xing <kernelxing@tencent.com>
Subject: [Intel-wired-lan] [PATCH net v2 3/3] ixgbe: add double of VLAN header when computing the max MTU
Date: Thu,  9 Feb 2023 10:41:28 +0800	[thread overview]
Message-ID: <20230209024128.4695-1-kerneljasonxing@gmail.com> (raw)

From: Jason Xing <kernelxing@tencent.com>

Include the second VLAN HLEN into account when computing the maximum
MTU size as other drivers do.

Fixes: fabf1bce103a ("ixgbe: Prevent unsupported configurations with XDP")
Signed-off-by: Jason Xing <kernelxing@tencent.com>
Reviewed-by: Alexander Duyck <alexanderduyck@fb.com>
---
v2: add reviewed-by label.
---
 drivers/net/ethernet/intel/ixgbe/ixgbe.h      | 2 ++
 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 3 +--
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe.h b/drivers/net/ethernet/intel/ixgbe/ixgbe.h
index bc68b8f2176d..8736ca4b2628 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe.h
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe.h
@@ -73,6 +73,8 @@
 #define IXGBE_RXBUFFER_4K    4096
 #define IXGBE_MAX_RXBUFFER  16384  /* largest size for a single descriptor */
 
+#define IXGBE_PKT_HDR_PAD   (ETH_HLEN + ETH_FCS_LEN + (VLAN_HLEN * 2))
+
 /* Attempt to maximize the headroom available for incoming frames.  We
  * use a 2K buffer for receives and need 1536/1534 to store the data for
  * the frame.  This leaves us with 512 bytes of room.  From that we need
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index 25ca329f7d3c..4507fba8747a 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -6801,8 +6801,7 @@ static int ixgbe_change_mtu(struct net_device *netdev, int new_mtu)
 	struct ixgbe_adapter *adapter = netdev_priv(netdev);
 
 	if (ixgbe_enabled_xdp_adapter(adapter)) {
-		int new_frame_size = new_mtu + ETH_HLEN + ETH_FCS_LEN +
-				     VLAN_HLEN;
+		int new_frame_size = new_mtu + IXGBE_PKT_HDR_PAD;
 
 		if (new_frame_size > ixgbe_max_xdp_frame_size(adapter)) {
 			e_warn(probe, "Requested MTU size is not supported with XDP\n");
-- 
2.37.3

_______________________________________________
Intel-wired-lan mailing list
Intel-wired-lan@osuosl.org
https://lists.osuosl.org/mailman/listinfo/intel-wired-lan

WARNING: multiple messages have this Message-ID (diff)
From: Jason Xing <kerneljasonxing@gmail.com>
To: alexander.duyck@gmail.com, jesse.brandeburg@intel.com,
	anthony.l.nguyen@intel.com, davem@davemloft.net,
	edumazet@google.com, kuba@kernel.org, pabeni@redhat.com,
	richardcochran@gmail.com, ast@kernel.org, daniel@iogearbox.net,
	hawk@kernel.org, john.fastabend@gmail.com,
	alexandr.lobakin@intel.com, maciej.fijalkowski@intel.com
Cc: intel-wired-lan@lists.osuosl.org, netdev@vger.kernel.org,
	linux-kernel@vger.kernel.org, bpf@vger.kernel.org,
	kerneljasonxing@gmail.com, Jason Xing <kernelxing@tencent.com>,
	Alexander Duyck <alexanderduyck@fb.com>
Subject: [PATCH net v2 3/3] ixgbe: add double of VLAN header when computing the max MTU
Date: Thu,  9 Feb 2023 10:41:28 +0800	[thread overview]
Message-ID: <20230209024128.4695-1-kerneljasonxing@gmail.com> (raw)

From: Jason Xing <kernelxing@tencent.com>

Include the second VLAN HLEN into account when computing the maximum
MTU size as other drivers do.

Fixes: fabf1bce103a ("ixgbe: Prevent unsupported configurations with XDP")
Signed-off-by: Jason Xing <kernelxing@tencent.com>
Reviewed-by: Alexander Duyck <alexanderduyck@fb.com>
---
v2: add reviewed-by label.
---
 drivers/net/ethernet/intel/ixgbe/ixgbe.h      | 2 ++
 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 3 +--
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe.h b/drivers/net/ethernet/intel/ixgbe/ixgbe.h
index bc68b8f2176d..8736ca4b2628 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe.h
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe.h
@@ -73,6 +73,8 @@
 #define IXGBE_RXBUFFER_4K    4096
 #define IXGBE_MAX_RXBUFFER  16384  /* largest size for a single descriptor */
 
+#define IXGBE_PKT_HDR_PAD   (ETH_HLEN + ETH_FCS_LEN + (VLAN_HLEN * 2))
+
 /* Attempt to maximize the headroom available for incoming frames.  We
  * use a 2K buffer for receives and need 1536/1534 to store the data for
  * the frame.  This leaves us with 512 bytes of room.  From that we need
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index 25ca329f7d3c..4507fba8747a 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -6801,8 +6801,7 @@ static int ixgbe_change_mtu(struct net_device *netdev, int new_mtu)
 	struct ixgbe_adapter *adapter = netdev_priv(netdev);
 
 	if (ixgbe_enabled_xdp_adapter(adapter)) {
-		int new_frame_size = new_mtu + ETH_HLEN + ETH_FCS_LEN +
-				     VLAN_HLEN;
+		int new_frame_size = new_mtu + IXGBE_PKT_HDR_PAD;
 
 		if (new_frame_size > ixgbe_max_xdp_frame_size(adapter)) {
 			e_warn(probe, "Requested MTU size is not supported with XDP\n");
-- 
2.37.3


             reply	other threads:[~2023-02-09  2:42 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-02-09  2:41 Jason Xing [this message]
2023-02-09  2:41 ` [PATCH net v2 3/3] ixgbe: add double of VLAN header when computing the max MTU Jason Xing
2023-02-14  2:19 ` [Intel-wired-lan] " Rout, ChandanX
2023-02-14  2:19   ` Rout, ChandanX

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