net/ncsi: Add NCSI Mellanox OEM command

This patch adds OEM Mellanox commands and response handling. It also
defines OEM Get MAC Address handler to get and configure the device.

ncsi_oem_gma_handler_mlx: This handler send NCSI mellanox command for
getting mac address.
ncsi_rsp_handler_oem_mlx: This handles response received for all
mellanox OEM commands.
ncsi_rsp_handler_oem_mlx_gma: This handles get mac address response and
set it to device.

Signed-off-by: Vijay Khemka <vijaykhemka@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

4 files changed, 81 insertions, 2 deletions

diff --git a/net/ncsi/internal.h b/net/ncsi/internal.h
index 9e3642b802c4..87505600dbb2 100644
--- a/net/ncsi/internal.h
+++ b/net/ncsi/internal.h
@@ -73,10 +73,15 @@ enum {
 #define NCSI_OEM_MFR_BCM_ID             0x113d
 /* Broadcom specific OEM Command */
 #define NCSI_OEM_BCM_CMD_GMA            0x01   /* CMD ID for Get MAC */
+/* Mellanox specific OEM Command */
+#define NCSI_OEM_MLX_CMD_GMA            0x00   /* CMD ID for Get MAC */
+#define NCSI_OEM_MLX_CMD_GMA_PARAM      0x1b   /* Parameter for GMA  */
 /* OEM Command payload lengths*/
 #define NCSI_OEM_BCM_CMD_GMA_LEN        12
+#define NCSI_OEM_MLX_CMD_GMA_LEN        8
 /* Mac address offset in OEM response */
 #define BCM_MAC_ADDR_OFFSET             28
+#define MLX_MAC_ADDR_OFFSET             8
 
 
 struct ncsi_channel_version {
diff --git a/net/ncsi/ncsi-manage.c b/net/ncsi/ncsi-manage.c
index 92e59f07f9a7..31359d5e14ad 100644
--- a/net/ncsi/ncsi-manage.c
+++ b/net/ncsi/ncsi-manage.c
@@ -710,12 +710,38 @@ static int ncsi_oem_gma_handler_bcm(struct ncsi_cmd_arg *nca)
         return ret;
 }
 
+static int ncsi_oem_gma_handler_mlx(struct ncsi_cmd_arg *nca)
+{
+        union {
+                u8 data_u8[NCSI_OEM_MLX_CMD_GMA_LEN];
+                u32 data_u32[NCSI_OEM_MLX_CMD_GMA_LEN / sizeof(u32)];
+        } u;
+        int ret = 0;
+
+        nca->payload = NCSI_OEM_MLX_CMD_GMA_LEN;
+
+        memset(&u, 0, sizeof(u));
+        u.data_u32[0] = ntohl(NCSI_OEM_MFR_MLX_ID);
+        u.data_u8[5] = NCSI_OEM_MLX_CMD_GMA;
+        u.data_u8[6] = NCSI_OEM_MLX_CMD_GMA_PARAM;
+
+        nca->data = u.data_u8;
+
+        ret = ncsi_xmit_cmd(nca);
+        if (ret)
+                netdev_err(nca->ndp->ndev.dev,
+                           "NCSI: Failed to transmit cmd 0x%x during configure\n",
+                           nca->type);
+        return ret;
+}
+
 /* OEM Command handlers initialization */
 static struct ncsi_oem_gma_handler {
         unsigned int    mfr_id;
         int             (*handler)(struct ncsi_cmd_arg *nca);
 } ncsi_oem_gma_handlers[] = {
-        { NCSI_OEM_MFR_BCM_ID, ncsi_oem_gma_handler_bcm }
+        { NCSI_OEM_MFR_BCM_ID, ncsi_oem_gma_handler_bcm },
+        { NCSI_OEM_MFR_MLX_ID, ncsi_oem_gma_handler_mlx }
 };
 
 static int ncsi_gma_handler(struct ncsi_cmd_arg *nca, unsigned int mf_id)
diff --git a/net/ncsi/ncsi-pkt.h b/net/ncsi/ncsi-pkt.h
index 4d3f06be38bd..2a6d83a596c9 100644
--- a/net/ncsi/ncsi-pkt.h
+++ b/net/ncsi/ncsi-pkt.h
@@ -165,6 +165,15 @@ struct ncsi_rsp_oem_pkt {
         unsigned char           data[];      /* Payload data      */
 };
 
+/* Mellanox Response Data */
+struct ncsi_rsp_oem_mlx_pkt {
+        unsigned char           cmd_rev;     /* Command Revision  */
+        unsigned char           cmd;         /* Command ID        */
+        unsigned char           param;       /* Parameter         */
+        unsigned char           optional;    /* Optional data     */
+        unsigned char           data[];      /* Data              */
+};
+
 /* Broadcom Response Data */
 struct ncsi_rsp_oem_bcm_pkt {
         unsigned char           ver;         /* Payload Version   */
diff --git a/net/ncsi/ncsi-rsp.c b/net/ncsi/ncsi-rsp.c
index de7737a27889..dc07fcc7938e 100644
--- a/net/ncsi/ncsi-rsp.c
+++ b/net/ncsi/ncsi-rsp.c
@@ -611,6 +611,45 @@ static int ncsi_rsp_handler_snfc(struct ncsi_request *nr)
         return 0;
 }
 
+/* Response handler for Mellanox command Get Mac Address */
+static int ncsi_rsp_handler_oem_mlx_gma(struct ncsi_request *nr)
+{
+        struct ncsi_dev_priv *ndp = nr->ndp;
+        struct net_device *ndev = ndp->ndev.dev;
+        const struct net_device_ops *ops = ndev->netdev_ops;
+        struct ncsi_rsp_oem_pkt *rsp;
+        struct sockaddr saddr;
+        int ret = 0;
+
+        /* Get the response header */
+        rsp = (struct ncsi_rsp_oem_pkt *)skb_network_header(nr->rsp);
+
+        saddr.sa_family = ndev->type;
+        ndev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
+        memcpy(saddr.sa_data, &rsp->data[MLX_MAC_ADDR_OFFSET], ETH_ALEN);
+        ret = ops->ndo_set_mac_address(ndev, &saddr);
+        if (ret < 0)
+                netdev_warn(ndev, "NCSI: 'Writing mac address to device failed\n");
+
+        return ret;
+}
+
+/* Response handler for Mellanox card */
+static int ncsi_rsp_handler_oem_mlx(struct ncsi_request *nr)
+{
+        struct ncsi_rsp_oem_mlx_pkt *mlx;
+        struct ncsi_rsp_oem_pkt *rsp;
+
+        /* Get the response header */
+        rsp = (struct ncsi_rsp_oem_pkt *)skb_network_header(nr->rsp);
+        mlx = (struct ncsi_rsp_oem_mlx_pkt *)(rsp->data);
+
+        if (mlx->cmd == NCSI_OEM_MLX_CMD_GMA &&
+            mlx->param == NCSI_OEM_MLX_CMD_GMA_PARAM)
+                return ncsi_rsp_handler_oem_mlx_gma(nr);
+        return 0;
+}
+
 /* Response handler for Broadcom command Get Mac Address */
 static int ncsi_rsp_handler_oem_bcm_gma(struct ncsi_request *nr)
 {
@@ -655,7 +694,7 @@ static struct ncsi_rsp_oem_handler {
         unsigned int    mfr_id;
         int             (*handler)(struct ncsi_request *nr);
 } ncsi_rsp_oem_handlers[] = {
-        { NCSI_OEM_MFR_MLX_ID, NULL },
+        { NCSI_OEM_MFR_MLX_ID, ncsi_rsp_handler_oem_mlx },
         { NCSI_OEM_MFR_BCM_ID, ncsi_rsp_handler_oem_bcm }
 };