[PATCH net-next v2 0/2] Get max rx packet length and solve

[PATCH net-next v2 0/2] Get max rx packet length and solve

[Shinas Rasheed]

Patchsets which resolve observed style issues in control net
source files, and also implements get mtu control net api
to fetch max mtu value from firmware

Changes:
V2:
  - Introduced a patch to resolve style issues as mentioned in V1
  - Removed OCTEP_MAX_MTU macro, as it is redundant.

V1: https://lore.kernel.org/all/20231121191224.2489474-1-srasheed@marvell.com/

Shinas Rasheed (2):
  octeon_ep: Solve style issues in control net files
  octeon_ep: get max rx packet length from firmware

 .../ethernet/marvell/octeon_ep/octep_config.h |   2 -
 .../marvell/octeon_ep/octep_ctrl_net.c        |  42 ++++--
 .../marvell/octeon_ep/octep_ctrl_net.h        | 125 +++++++++++-------
 .../ethernet/marvell/octeon_ep/octep_main.c   |  10 +-
 4 files changed, 113 insertions(+), 66 deletions(-)

-- 
2.25.1

[PATCH net-next v2 1/2] octeon_ep: Solve style issues in control net files

[Shinas Rasheed]

Solve observed style issues for kernel documentation
and structure declarations in control net API definitions.

Signed-off-by: Shinas Rasheed <srasheed@marvell.com>
---
V2:
   - Introduced the patch due to kernel doc style and structure
     initialisation comments obtained in V1 of patch 2

 .../marvell/octeon_ep/octep_ctrl_net.c        |  24 ++--
 .../marvell/octeon_ep/octep_ctrl_net.h        | 115 ++++++++++--------
 2 files changed, 76 insertions(+), 63 deletions(-)

diff --git a/drivers/net/ethernet/marvell/octeon_ep/octep_ctrl_net.c b/drivers/net/ethernet/marvell/octeon_ep/octep_ctrl_net.c
index 0594607a2585..2eeeaa7188b1 100644
--- a/drivers/net/ethernet/marvell/octeon_ep/octep_ctrl_net.c
+++ b/drivers/net/ethernet/marvell/octeon_ep/octep_ctrl_net.c
@@ -122,7 +122,7 @@ int octep_ctrl_net_init(struct octep_device *oct)
 
 int octep_ctrl_net_get_link_status(struct octep_device *oct, int vfid)
 {
-	struct octep_ctrl_net_wait_data d = {0};
+	struct octep_ctrl_net_wait_data d = {};
 	struct octep_ctrl_net_h2f_req *req = &d.data.req;
 	int err;
 
@@ -139,7 +139,7 @@ int octep_ctrl_net_get_link_status(struct octep_device *oct, int vfid)
 int octep_ctrl_net_set_link_status(struct octep_device *oct, int vfid, bool up,
 				   bool wait_for_response)
 {
-	struct octep_ctrl_net_wait_data d = {0};
+	struct octep_ctrl_net_wait_data d = {};
 	struct octep_ctrl_net_h2f_req *req = &d.data.req;
 
 	init_send_req(&d.msg, req, state_sz, vfid);
@@ -154,7 +154,7 @@ int octep_ctrl_net_set_link_status(struct octep_device *oct, int vfid, bool up,
 int octep_ctrl_net_set_rx_state(struct octep_device *oct, int vfid, bool up,
 				bool wait_for_response)
 {
-	struct octep_ctrl_net_wait_data d = {0};
+	struct octep_ctrl_net_wait_data d = {};
 	struct octep_ctrl_net_h2f_req *req = &d.data.req;
 
 	init_send_req(&d.msg, req, state_sz, vfid);
@@ -168,7 +168,7 @@ int octep_ctrl_net_set_rx_state(struct octep_device *oct, int vfid, bool up,
 
 int octep_ctrl_net_get_mac_addr(struct octep_device *oct, int vfid, u8 *addr)
 {
-	struct octep_ctrl_net_wait_data d = {0};
+	struct octep_ctrl_net_wait_data d = {};
 	struct octep_ctrl_net_h2f_req *req = &d.data.req;
 	int err;
 
@@ -187,7 +187,7 @@ int octep_ctrl_net_get_mac_addr(struct octep_device *oct, int vfid, u8 *addr)
 int octep_ctrl_net_set_mac_addr(struct octep_device *oct, int vfid, u8 *addr,
 				bool wait_for_response)
 {
-	struct octep_ctrl_net_wait_data d = {0};
+	struct octep_ctrl_net_wait_data d = {};
 	struct octep_ctrl_net_h2f_req *req = &d.data.req;
 
 	init_send_req(&d.msg, req, mac_sz, vfid);
@@ -201,7 +201,7 @@ int octep_ctrl_net_set_mac_addr(struct octep_device *oct, int vfid, u8 *addr,
 int octep_ctrl_net_set_mtu(struct octep_device *oct, int vfid, int mtu,
 			   bool wait_for_response)
 {
-	struct octep_ctrl_net_wait_data d = {0};
+	struct octep_ctrl_net_wait_data d = {};
 	struct octep_ctrl_net_h2f_req *req = &d.data.req;
 
 	init_send_req(&d.msg, req, mtu_sz, vfid);
@@ -216,7 +216,7 @@ int octep_ctrl_net_get_if_stats(struct octep_device *oct, int vfid,
 				struct octep_iface_rx_stats *rx_stats,
 				struct octep_iface_tx_stats *tx_stats)
 {
-	struct octep_ctrl_net_wait_data d = {0};
+	struct octep_ctrl_net_wait_data d = {};
 	struct octep_ctrl_net_h2f_req *req = &d.data.req;
 	struct octep_ctrl_net_h2f_resp *resp;
 	int err;
@@ -236,7 +236,7 @@ int octep_ctrl_net_get_if_stats(struct octep_device *oct, int vfid,
 int octep_ctrl_net_get_link_info(struct octep_device *oct, int vfid,
 				 struct octep_iface_link_info *link_info)
 {
-	struct octep_ctrl_net_wait_data d = {0};
+	struct octep_ctrl_net_wait_data d = {};
 	struct octep_ctrl_net_h2f_req *req = &d.data.req;
 	struct octep_ctrl_net_h2f_resp *resp;
 	int err;
@@ -262,7 +262,7 @@ int octep_ctrl_net_set_link_info(struct octep_device *oct, int vfid,
 				 struct octep_iface_link_info *link_info,
 				 bool wait_for_response)
 {
-	struct octep_ctrl_net_wait_data d = {0};
+	struct octep_ctrl_net_wait_data d = {};
 	struct octep_ctrl_net_h2f_req *req = &d.data.req;
 
 	init_send_req(&d.msg, req, link_info_sz, vfid);
@@ -331,8 +331,8 @@ static int process_mbox_notify(struct octep_device *oct,
 void octep_ctrl_net_recv_fw_messages(struct octep_device *oct)
 {
 	static u16 msg_sz = sizeof(union octep_ctrl_net_max_data);
-	union octep_ctrl_net_max_data data = {0};
-	struct octep_ctrl_mbox_msg msg = {0};
+	union octep_ctrl_net_max_data data = {};
+	struct octep_ctrl_mbox_msg msg = {};
 	int ret;
 
 	msg.hdr.s.sz = msg_sz;
@@ -356,7 +356,7 @@ void octep_ctrl_net_recv_fw_messages(struct octep_device *oct)
 int octep_ctrl_net_get_info(struct octep_device *oct, int vfid,
 			    struct octep_fw_info *info)
 {
-	struct octep_ctrl_net_wait_data d = {0};
+	struct octep_ctrl_net_wait_data d = {};
 	struct octep_ctrl_net_h2f_resp *resp;
 	struct octep_ctrl_net_h2f_req *req;
 	int err;
diff --git a/drivers/net/ethernet/marvell/octeon_ep/octep_ctrl_net.h b/drivers/net/ethernet/marvell/octeon_ep/octep_ctrl_net.h
index b330f370131b..02b8fcf890d0 100644
--- a/drivers/net/ethernet/marvell/octeon_ep/octep_ctrl_net.h
+++ b/drivers/net/ethernet/marvell/octeon_ep/octep_ctrl_net.h
@@ -218,87 +218,95 @@ struct octep_ctrl_net_wait_data {
 	} data;
 };
 
-/** Initialize data for ctrl net.
+/**
+ * octep_ctrl_net_init() - Initialize data for ctrl net.
  *
- * @param oct: non-null pointer to struct octep_device.
+ * @oct: non-null pointer to struct octep_device.
  *
  * return value: 0 on success, -errno on error.
  */
 int octep_ctrl_net_init(struct octep_device *oct);
 
-/** Get link status from firmware.
+/** 
+ * octep_ctrl_net_get_link_status() - Get link status from firmware.
  *
- * @param oct: non-null pointer to struct octep_device.
- * @param vfid: Index of virtual function.
+ * @oct: non-null pointer to struct octep_device.
+ * @vfid: Index of virtual function.
  *
  * return value: link status 0=down, 1=up.
  */
 int octep_ctrl_net_get_link_status(struct octep_device *oct, int vfid);
 
-/** Set link status in firmware.
+/**
+ * octep_ctrl_net_set_link_status() - Set link status in firmware.
  *
- * @param oct: non-null pointer to struct octep_device.
- * @param vfid: Index of virtual function.
- * @param up: boolean status.
- * @param wait_for_response: poll for response.
+ * @oct: non-null pointer to struct octep_device.
+ * @vfid: Index of virtual function.
+ * @up: boolean status.
+ * @wait_for_response: poll for response.
  *
  * return value: 0 on success, -errno on failure
  */
 int octep_ctrl_net_set_link_status(struct octep_device *oct, int vfid, bool up,
 				   bool wait_for_response);
 
-/** Set rx state in firmware.
+/**
+ * octep_ctrl_net_set_rx_state() - Set rx state in firmware.
  *
- * @param oct: non-null pointer to struct octep_device.
- * @param vfid: Index of virtual function.
- * @param up: boolean status.
- * @param wait_for_response: poll for response.
+ * @oct: non-null pointer to struct octep_device.
+ * @vfid: Index of virtual function.
+ * @up: boolean status.
+ * @wait_for_response: poll for response.
  *
  * return value: 0 on success, -errno on failure.
  */
 int octep_ctrl_net_set_rx_state(struct octep_device *oct, int vfid, bool up,
 				bool wait_for_response);
 
-/** Get mac address from firmware.
+/** 
+ * octep_ctrl_net_get_mac_addr() - Get mac address from firmware.
  *
- * @param oct: non-null pointer to struct octep_device.
- * @param vfid: Index of virtual function.
- * @param addr: non-null pointer to mac address.
+ * @oct: non-null pointer to struct octep_device.
+ * @vfid: Index of virtual function.
+ * @addr: non-null pointer to mac address.
  *
  * return value: 0 on success, -errno on failure.
  */
 int octep_ctrl_net_get_mac_addr(struct octep_device *oct, int vfid, u8 *addr);
 
-/** Set mac address in firmware.
+/**
+ * octep_ctrl_net_set_mac_addr() - Set mac address in firmware.
  *
- * @param oct: non-null pointer to struct octep_device.
- * @param vfid: Index of virtual function.
- * @param addr: non-null pointer to mac address.
- * @param wait_for_response: poll for response.
+ * @oct: non-null pointer to struct octep_device.
+ * @vfid: Index of virtual function.
+ * @addr: non-null pointer to mac address.
+ * @wait_for_response: poll for response.
  *
  * return value: 0 on success, -errno on failure.
  */
 int octep_ctrl_net_set_mac_addr(struct octep_device *oct, int vfid, u8 *addr,
 				bool wait_for_response);
 
-/** Set mtu in firmware.
+/** 
+ * octep_ctrl_net_set_mtu() - Set mtu in firmware.
  *
- * @param oct: non-null pointer to struct octep_device.
- * @param vfid: Index of virtual function.
- * @param mtu: mtu.
- * @param wait_for_response: poll for response.
+ * @oct: non-null pointer to struct octep_device.
+ * @vfid: Index of virtual function.
+ * @mtu: mtu.
+ * @wait_for_response: poll for response.
  *
  * return value: 0 on success, -errno on failure.
  */
 int octep_ctrl_net_set_mtu(struct octep_device *oct, int vfid, int mtu,
 			   bool wait_for_response);
 
-/** Get interface statistics from firmware.
+/**
+ * octep_ctrl_net_get_if_stats() - Get interface statistics from firmware.
  *
- * @param oct: non-null pointer to struct octep_device.
- * @param vfid: Index of virtual function.
- * @param rx_stats: non-null pointer struct octep_iface_rx_stats.
- * @param tx_stats: non-null pointer struct octep_iface_tx_stats.
+ * @oct: non-null pointer to struct octep_device.
+ * @vfid: Index of virtual function.
+ * @rx_stats: non-null pointer struct octep_iface_rx_stats.
+ * @tx_stats: non-null pointer struct octep_iface_tx_stats.
  *
  * return value: 0 on success, -errno on failure.
  */
@@ -306,23 +314,25 @@ int octep_ctrl_net_get_if_stats(struct octep_device *oct, int vfid,
 				struct octep_iface_rx_stats *rx_stats,
 				struct octep_iface_tx_stats *tx_stats);
 
-/** Get link info from firmware.
+/**
+ * octep_ctrl_net_get_link_info() - Get link info from firmware.
  *
- * @param oct: non-null pointer to struct octep_device.
- * @param vfid: Index of virtual function.
- * @param link_info: non-null pointer to struct octep_iface_link_info.
+ * @oct: non-null pointer to struct octep_device.
+ * @vfid: Index of virtual function.
+ * @link_info: non-null pointer to struct octep_iface_link_info.
  *
  * return value: 0 on success, -errno on failure.
  */
 int octep_ctrl_net_get_link_info(struct octep_device *oct, int vfid,
 				 struct octep_iface_link_info *link_info);
 
-/** Set link info in firmware.
+/**
+ * octep_ctrl_net_set_link_info() - Set link info in firmware.
  *
- * @param oct: non-null pointer to struct octep_device.
- * @param vfid: Index of virtual function.
- * @param link_info: non-null pointer to struct octep_iface_link_info.
- * @param wait_for_response: poll for response.
+ * @oct: non-null pointer to struct octep_device.
+ * @vfid: Index of virtual function.
+ * @link_info: non-null pointer to struct octep_iface_link_info.
+ * @wait_for_response: poll for response.
  *
  * return value: 0 on success, -errno on failure.
  */
@@ -331,26 +341,29 @@ int octep_ctrl_net_set_link_info(struct octep_device *oct,
 				 struct octep_iface_link_info *link_info,
 				 bool wait_for_response);
 
-/** Poll for firmware messages and process them.
+/**
+ * octep_ctrl_net_recv_fw_messages() - Poll for firmware messages and process them.
  *
- * @param oct: non-null pointer to struct octep_device.
+ * @oct: non-null pointer to struct octep_device.
  */
 void octep_ctrl_net_recv_fw_messages(struct octep_device *oct);
 
-/** Get info from firmware.
+/**
+ * octep_ctrl_net_get_info() - Get info from firmware.
  *
- * @param oct: non-null pointer to struct octep_device.
- * @param vfid: Index of virtual function.
- * @param info: non-null pointer to struct octep_fw_info.
+ * @oct: non-null pointer to struct octep_device.
+ * @vfid: Index of virtual function.
+ * @info: non-null pointer to struct octep_fw_info.
  *
  * return value: 0 on success, -errno on failure.
  */
 int octep_ctrl_net_get_info(struct octep_device *oct, int vfid,
 			    struct octep_fw_info *info);
 
-/** Uninitialize data for ctrl net.
+/**
+ * octep_ctrl_net_uninit() - Uninitialize data for ctrl net.
  *
- * @param oct: non-null pointer to struct octep_device.
+ * @oct: non-null pointer to struct octep_device.
  *
  * return value: 0 on success, -errno on error.
  */
-- 
2.25.1

[PATCH net-next v2 2/2] octeon_ep: get max rx packet length from firmware

[Shinas Rasheed]

Max receive packet length can vary across SoCs, so
this needs to be queried from respective firmware and
filled by driver. A control net get mtu api should be
implemented to do the same.

Signed-off-by: Shinas Rasheed <srasheed@marvell.com>
---
V2:
  - Removed OCTEP_MAX_MTU macro as it is redundant.

V1: https://lore.kernel.org/all/20231121191224.2489474-1-srasheed@marvell.com/

 .../ethernet/marvell/octeon_ep/octep_config.h  |  2 --
 .../marvell/octeon_ep/octep_ctrl_net.c         | 18 ++++++++++++++++++
 .../marvell/octeon_ep/octep_ctrl_net.h         | 10 ++++++++++
 .../ethernet/marvell/octeon_ep/octep_main.c    | 10 +++++++++-
 4 files changed, 37 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/marvell/octeon_ep/octep_config.h b/drivers/net/ethernet/marvell/octeon_ep/octep_config.h
index 91cfa19c65b9..4c937ba5589f 100644
--- a/drivers/net/ethernet/marvell/octeon_ep/octep_config.h
+++ b/drivers/net/ethernet/marvell/octeon_ep/octep_config.h
@@ -45,8 +45,6 @@
 
 /* Minimum MTU supported by Octeon network interface */
 #define OCTEP_MIN_MTU        ETH_MIN_MTU
-/* Maximum MTU supported by Octeon interface*/
-#define OCTEP_MAX_MTU        (10000 - (ETH_HLEN + ETH_FCS_LEN))
 /* Default MTU */
 #define OCTEP_DEFAULT_MTU    1500
 
diff --git a/drivers/net/ethernet/marvell/octeon_ep/octep_ctrl_net.c b/drivers/net/ethernet/marvell/octeon_ep/octep_ctrl_net.c
index 2eeeaa7188b1..5fa596c674da 100644
--- a/drivers/net/ethernet/marvell/octeon_ep/octep_ctrl_net.c
+++ b/drivers/net/ethernet/marvell/octeon_ep/octep_ctrl_net.c
@@ -198,6 +198,24 @@ int octep_ctrl_net_set_mac_addr(struct octep_device *oct, int vfid, u8 *addr,
 	return octep_send_mbox_req(oct, &d, wait_for_response);
 }
 
+int octep_ctrl_net_get_mtu(struct octep_device *oct, int vfid)
+{
+	struct octep_ctrl_net_wait_data d = {};
+	struct octep_ctrl_net_h2f_req *req;
+	int err;
+
+	req = &d.data.req;
+	init_send_req(&d.msg, req, mtu_sz, vfid);
+	req->hdr.s.cmd = OCTEP_CTRL_NET_H2F_CMD_MTU;
+	req->mtu.cmd = OCTEP_CTRL_NET_CMD_GET;
+
+	err = octep_send_mbox_req(oct, &d, true);
+	if (err < 0)
+		return err;
+
+	return d.data.resp.mtu.val;
+}
+
 int octep_ctrl_net_set_mtu(struct octep_device *oct, int vfid, int mtu,
 			   bool wait_for_response)
 {
diff --git a/drivers/net/ethernet/marvell/octeon_ep/octep_ctrl_net.h b/drivers/net/ethernet/marvell/octeon_ep/octep_ctrl_net.h
index 02b8fcf890d0..a2463b460ad9 100644
--- a/drivers/net/ethernet/marvell/octeon_ep/octep_ctrl_net.h
+++ b/drivers/net/ethernet/marvell/octeon_ep/octep_ctrl_net.h
@@ -287,6 +287,16 @@ int octep_ctrl_net_get_mac_addr(struct octep_device *oct, int vfid, u8 *addr);
 int octep_ctrl_net_set_mac_addr(struct octep_device *oct, int vfid, u8 *addr,
 				bool wait_for_response);
 
+/**
+ * octep_ctrl_net_get_mtu() - Get max MTU from firmware.
+ *
+ * @oct: non-null pointer to struct octep_device.
+ * @vfid: Index of virtual function.
+ *
+ * return value: mtu on success, -errno on failure.
+ */
+int octep_ctrl_net_get_mtu(struct octep_device *oct, int vfid);
+
 /** 
  * octep_ctrl_net_set_mtu() - Set mtu in firmware.
  *
diff --git a/drivers/net/ethernet/marvell/octeon_ep/octep_main.c b/drivers/net/ethernet/marvell/octeon_ep/octep_main.c
index 2da00a701df2..423eec5ff3ad 100644
--- a/drivers/net/ethernet/marvell/octeon_ep/octep_main.c
+++ b/drivers/net/ethernet/marvell/octeon_ep/octep_main.c
@@ -1307,6 +1307,7 @@ static int octep_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 {
 	struct octep_device *octep_dev = NULL;
 	struct net_device *netdev;
+	int max_rx_pktlen;
 	int err;
 
 	err = pci_enable_device(pdev);
@@ -1377,8 +1378,15 @@ static int octep_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 
 	netdev->hw_features = NETIF_F_SG;
 	netdev->features |= netdev->hw_features;
+
+	max_rx_pktlen = octep_ctrl_net_get_mtu(octep_dev, OCTEP_CTRL_NET_INVALID_VFID);
+	if (max_rx_pktlen < 0) {
+		dev_err(&octep_dev->pdev->dev,
+			"Failed to get max receive packet size; err = %d\n", max_rx_pktlen);
+		goto register_dev_err;
+	}
 	netdev->min_mtu = OCTEP_MIN_MTU;
-	netdev->max_mtu = OCTEP_MAX_MTU;
+	netdev->max_mtu = max_rx_pktlen - (ETH_HLEN + ETH_FCS_LEN);
 	netdev->mtu = OCTEP_DEFAULT_MTU;
 
 	err = octep_ctrl_net_get_mac_addr(octep_dev, OCTEP_CTRL_NET_INVALID_VFID,
-- 
2.25.1

Re: [PATCH net-next v2 0/2] Get max rx packet length and solve

[patchwork-bot+netdevbpf]

Hello:

This series was applied to netdev/net-next.git (main)
by David S. Miller <davem@davemloft.net>:

On Wed, 22 Nov 2023 10:34:33 -0800 you wrote:
> Patchsets which resolve observed style issues in control net
> source files, and also implements get mtu control net api
> to fetch max mtu value from firmware
> 
> Changes:
> V2:
>   - Introduced a patch to resolve style issues as mentioned in V1
>   - Removed OCTEP_MAX_MTU macro, as it is redundant.
> 
> [...]

Here is the summary with links:
  - [net-next,v2,1/2] octeon_ep: Solve style issues in control net files
    https://git.kernel.org/netdev/net-next/c/e40f4c4e50fc
  - [net-next,v2,2/2] octeon_ep: get max rx packet length from firmware
    https://git.kernel.org/netdev/net-next/c/0a5f8534e398

You are awesome, thank you!
-- 
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html

Re: [PATCH net-next v2 2/2] octeon_ep: get max rx packet length from firmware

[Simon Horman]

On Wed, Nov 22, 2023 at 10:34:35AM -0800, Shinas Rasheed wrote:
> Max receive packet length can vary across SoCs, so
> this needs to be queried from respective firmware and
> filled by driver. A control net get mtu api should be
> implemented to do the same.
> 
> Signed-off-by: Shinas Rasheed <srasheed@marvell.com>

...

> diff --git a/drivers/net/ethernet/marvell/octeon_ep/octep_main.c b/drivers/net/ethernet/marvell/octeon_ep/octep_main.c
> index 2da00a701df2..423eec5ff3ad 100644
> --- a/drivers/net/ethernet/marvell/octeon_ep/octep_main.c
> +++ b/drivers/net/ethernet/marvell/octeon_ep/octep_main.c
> @@ -1307,6 +1307,7 @@ static int octep_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
>  {
>  	struct octep_device *octep_dev = NULL;
>  	struct net_device *netdev;
> +	int max_rx_pktlen;
>  	int err;
>  
>  	err = pci_enable_device(pdev);
> @@ -1377,8 +1378,15 @@ static int octep_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
>  
>  	netdev->hw_features = NETIF_F_SG;
>  	netdev->features |= netdev->hw_features;
> +
> +	max_rx_pktlen = octep_ctrl_net_get_mtu(octep_dev, OCTEP_CTRL_NET_INVALID_VFID);
> +	if (max_rx_pktlen < 0) {
> +		dev_err(&octep_dev->pdev->dev,
> +			"Failed to get max receive packet size; err = %d\n", max_rx_pktlen);
> +		goto register_dev_err;

Hi Shinas,

This jump will cause this function to return err.  But err is 0 here.
Perhaps it should be set to a negative error value instead?

> +	}
>  	netdev->min_mtu = OCTEP_MIN_MTU;
> -	netdev->max_mtu = OCTEP_MAX_MTU;
> +	netdev->max_mtu = max_rx_pktlen - (ETH_HLEN + ETH_FCS_LEN);
>  	netdev->mtu = OCTEP_DEFAULT_MTU;
>  
>  	err = octep_ctrl_net_get_mac_addr(octep_dev, OCTEP_CTRL_NET_INVALID_VFID,
> -- 
> 2.25.1
> 

RE: [EXT] Re: [PATCH net-next v2 2/2] octeon_ep: get max rx packet length from firmware

[Shinas Rasheed]

Hi Simon,

> -----Original Message-----
> From: Simon Horman <horms@kernel.org>
> Sent: Friday, November 24, 2023 10:38 PM
> To: Shinas Rasheed <srasheed@marvell.com>
> Cc: netdev@vger.kernel.org; linux-kernel@vger.kernel.org; Haseeb Gani
> <hgani@marvell.com>; Vimlesh Kumar <vimleshk@marvell.com>;
> egallen@redhat.com; mschmidt@redhat.com; pabeni@redhat.com;
> kuba@kernel.org; davem@davemloft.net; wizhao@redhat.com;
> konguyen@redhat.com; jesse.brandeburg@intel.com; Suman Ghosh
> <sumang@marvell.com>; Veerasenareddy Burru <vburru@marvell.com>;
> Sathesh B Edara <sedara@marvell.com>; Eric Dumazet
> <edumazet@google.com>
> Subject: [EXT] Re: [PATCH net-next v2 2/2] octeon_ep: get max rx packet
> length from firmware
> > diff --git a/drivers/net/ethernet/marvell/octeon_ep/octep_main.c
> b/drivers/net/ethernet/marvell/octeon_ep/octep_main.c
> > index 2da00a701df2..423eec5ff3ad 100644
> > --- a/drivers/net/ethernet/marvell/octeon_ep/octep_main.c
> > +++ b/drivers/net/ethernet/marvell/octeon_ep/octep_main.c
> > @@ -1377,8 +1378,15 @@ static int octep_probe(struct pci_dev *pdev,
> const struct pci_device_id *ent)
> >
> >  	netdev->hw_features = NETIF_F_SG;
> >  	netdev->features |= netdev->hw_features;
> > +
> > +	max_rx_pktlen = octep_ctrl_net_get_mtu(octep_dev,
> OCTEP_CTRL_NET_INVALID_VFID);
> > +	if (max_rx_pktlen < 0) {
> > +		dev_err(&octep_dev->pdev->dev,
> > +			"Failed to get max receive packet size; err = %d\n",
> max_rx_pktlen);
> > +		goto register_dev_err;
> 
> Hi Shinas,
> 
> This jump will cause this function to return err.  But err is 0 here.
> Perhaps it should be set to a negative error value instead?

Yes I think that was a slight erroneous oversight. I see that this patch has been accepted. I shall commit a fix for the same after review in the net branch doing the same.