qed: Add Light L2 support

Other protocols beside the networking driver need the ability
of passing some L2 traffic, usually [although not limited] for the
purpose of some management traffic.

Signed-off-by: Yuval Mintz <Yuval.Mintz@caviumnetworks.com>
Signed-off-by: Ram Amrani <Ram.Amrani@caviumnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 140 insertions, 0 deletions

diff --git a/include/linux/qed/qed_if.h b/include/linux/qed/qed_if.h
index e4546abcea08..c2d74e8785cf 100644
--- a/include/linux/qed/qed_if.h
+++ b/include/linux/qed/qed_if.h
@@ -627,6 +627,7 @@ enum DP_MODULE {
         QED_MSG_SP      = 0x100000,
         QED_MSG_STORAGE = 0x200000,
         QED_MSG_CXT     = 0x800000,
+        QED_MSG_LL2     = 0x1000000,
         QED_MSG_ILT     = 0x2000000,
         QED_MSG_ROCE    = 0x4000000,
         QED_MSG_DEBUG   = 0x8000000,
diff --git a/include/linux/qed/qed_ll2_if.h b/include/linux/qed/qed_ll2_if.h
new file mode 100644
index 000000000000..fd75c265dba3
--- /dev/null
+++ b/include/linux/qed/qed_ll2_if.h
@@ -0,0 +1,139 @@
+/* QLogic qed NIC Driver
+ *
+ * Copyright (c) 2015 QLogic Corporation
+ *
+ * This software is available under the terms of the GNU General Public License
+ * (GPL) Version 2, available from the file COPYING in the main directory of
+ * this source tree.
+ */
+
+#ifndef _QED_LL2_IF_H
+#define _QED_LL2_IF_H
+
+#include <linux/types.h>
+#include <linux/interrupt.h>
+#include <linux/netdevice.h>
+#include <linux/pci.h>
+#include <linux/skbuff.h>
+#include <linux/version.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/qed/qed_if.h>
+
+struct qed_ll2_stats {
+        u64 gsi_invalid_hdr;
+        u64 gsi_invalid_pkt_length;
+        u64 gsi_unsupported_pkt_typ;
+        u64 gsi_crcchksm_error;
+
+        u64 packet_too_big_discard;
+        u64 no_buff_discard;
+
+        u64 rcv_ucast_bytes;
+        u64 rcv_mcast_bytes;
+        u64 rcv_bcast_bytes;
+        u64 rcv_ucast_pkts;
+        u64 rcv_mcast_pkts;
+        u64 rcv_bcast_pkts;
+
+        u64 sent_ucast_bytes;
+        u64 sent_mcast_bytes;
+        u64 sent_bcast_bytes;
+        u64 sent_ucast_pkts;
+        u64 sent_mcast_pkts;
+        u64 sent_bcast_pkts;
+};
+
+#define QED_LL2_UNUSED_HANDLE   (0xff)
+
+struct qed_ll2_cb_ops {
+        int (*rx_cb)(void *, struct sk_buff *, u32, u32);
+        int (*tx_cb)(void *, struct sk_buff *, bool);
+};
+
+struct qed_ll2_params {
+        u16 mtu;
+        bool drop_ttl0_packets;
+        bool rx_vlan_stripping;
+        u8 tx_tc;
+        bool frags_mapped;
+        u8 ll2_mac_address[ETH_ALEN];
+};
+
+struct qed_ll2_ops {
+/**
+ * @brief start - initializes ll2
+ *
+ * @param cdev
+ * @param params - protocol driver configuration for the ll2.
+ *
+ * @return 0 on success, otherwise error value.
+ */
+        int (*start)(struct qed_dev *cdev, struct qed_ll2_params *params);
+
+/**
+ * @brief stop - stops the ll2
+ *
+ * @param cdev
+ *
+ * @return 0 on success, otherwise error value.
+ */
+        int (*stop)(struct qed_dev *cdev);
+
+/**
+ * @brief start_xmit - transmits an skb over the ll2 interface
+ *
+ * @param cdev
+ * @param skb
+ *
+ * @return 0 on success, otherwise error value.
+ */
+        int (*start_xmit)(struct qed_dev *cdev, struct sk_buff *skb);
+
+/**
+ * @brief register_cb_ops - protocol driver register the callback for Rx/Tx
+ * packets. Should be called before `start'.
+ *
+ * @param cdev
+ * @param cookie - to be passed to the callback functions.
+ * @param ops - the callback functions to register for Rx / Tx.
+ *
+ * @return 0 on success, otherwise error value.
+ */
+        void (*register_cb_ops)(struct qed_dev *cdev,
+                                const struct qed_ll2_cb_ops *ops,
+                                void *cookie);
+
+/**
+ * @brief get LL2 related statistics
+ *
+ * @param cdev
+ * @param stats - pointer to struct that would be filled with stats
+ *
+ * @return 0 on success, error otherwise.
+ */
+        int (*get_stats)(struct qed_dev *cdev, struct qed_ll2_stats *stats);
+};
+
+#ifdef CONFIG_QED_LL2
+int qed_ll2_alloc_if(struct qed_dev *);
+void qed_ll2_dealloc_if(struct qed_dev *);
+#else
+static const struct qed_ll2_ops qed_ll2_ops_pass = {
+        .start = NULL,
+        .stop = NULL,
+        .start_xmit = NULL,
+        .register_cb_ops = NULL,
+        .get_stats = NULL,
+};
+
+static inline int qed_ll2_alloc_if(struct qed_dev *cdev)
+{
+        return 0;
+}
+
+static inline void qed_ll2_dealloc_if(struct qed_dev *cdev)
+{
+}
+#endif
+#endif