[v2,2/7] net/txgbe: add device arguments

diff --git a/doc/guides/nics/txgbe.rst b/doc/guides/nics/txgbe.rst
index e520f13f3..f56993c45 100644
--- a/doc/guides/nics/txgbe.rst
+++ b/doc/guides/nics/txgbe.rst
@@ -84,6 +84,56 @@  TXGBE PMD provides the following log types available for control:
 
   Extra logging of the messages during PMD initialization.
 
+Runtime Options
+~~~~~~~~~~~~~~~
+
+The following ``devargs`` options can be enabled at runtime. They must
+be passed as part of EAL arguments. For example,
+
+.. code-block:: console
+
+   dpdk-testpmd -a 01:00.0,auto=1 -- -i
+
+Please note that following ``devargs`` are only set for backplane NICs.
+
+- ``auto`` (default **1**)
+
+  Toggle behavior to use auto-negotiation mode or force mode to
+  link up backplane NICs.
+
+- ``poll`` (default **0**)
+
+  Toggle behavior to enable/disable polling mode to receive AN interrupt.
+
+- ``present`` (default **1**)
+
+  Toggle behavior to use present mode or init mode.
+
+- ``sgmii`` (default **0**)
+
+  Special treatment for KX SGMII cards.
+
+- ``ffe_set`` (default **0**)
+
+  Use to set PHY link mode and enable FFE parameters for user debugging.
+  If disabled, the FFE parameters will not take effect. Otherwise, set 1
+  for SFI mode, set 2 for KR mode, set 3 for KX4 mode, set 4 for KX mode.
+
+- ``ffe_main`` (default **27**)
+
+  PHY parameter used for user debugging. Setting other values to
+  take effect requires setting the ``ffe_set``.
+
+- ``ffe_pre`` (default **8**)
+
+  PHY parameter used for user debugging. Setting other values to
+  take effect requires setting the ``ffe_set``.
+
+- ``ffe_post`` (default **44**)
+
+  PHY parameter used for user debugging. Setting other values to
+  take effect requires setting the ``ffe_set``.
+
 Driver compilation and testing
 ------------------------------
 
diff --git a/drivers/net/txgbe/base/txgbe_type.h b/drivers/net/txgbe/base/txgbe_type.h
index 2c8a3866a..008fcb25b 100644
--- a/drivers/net/txgbe/base/txgbe_type.h
+++ b/drivers/net/txgbe/base/txgbe_type.h
@@ -682,6 +682,33 @@  struct txgbe_phy_info {
 	bool qsfp_shared_i2c_bus;
 	u32 nw_mng_if_sel;
 	u32 link_mode;
+
+	/* Some features need tri-state capability */
+	u16 ffe_set;
+	u16 ffe_main;
+	u16 ffe_pre;
+	u16 ffe_post;
+};
+
+#define TXGBE_DEVARG_BP_AUTO		"auto"
+#define TXGBE_DEVARG_KR_POLL		"poll"
+#define TXGBE_DEVARG_KR_PRESENT		"present"
+#define TXGBE_DEVARG_KX_SGMII		"sgmii"
+#define TXGBE_DEVARG_FFE_SET		"ffe_set"
+#define TXGBE_DEVARG_FFE_MAIN		"ffe_main"
+#define TXGBE_DEVARG_FFE_PRE		"ffe_pre"
+#define TXGBE_DEVARG_FFE_POST		"ffe_post"
+
+static const char * const txgbe_valid_arguments[] = {
+	TXGBE_DEVARG_BP_AUTO,
+	TXGBE_DEVARG_KR_POLL,
+	TXGBE_DEVARG_KR_PRESENT,
+	TXGBE_DEVARG_KX_SGMII,
+	TXGBE_DEVARG_FFE_SET,
+	TXGBE_DEVARG_FFE_MAIN,
+	TXGBE_DEVARG_FFE_PRE,
+	TXGBE_DEVARG_FFE_POST,
+	NULL
 };
 
 struct txgbe_mbx_stats {
@@ -720,6 +747,14 @@  enum txgbe_isb_idx {
 	TXGBE_ISB_MAX
 };
 
+struct txgbe_devargs {
+	u16 bp_log;
+	u16 auto_neg;
+	u16 poll;
+	u16 present;
+	u16 sgmii;
+};
+
 struct txgbe_hw {
 	void IOMEM *hw_addr;
 	void *back;
@@ -741,6 +776,7 @@  struct txgbe_hw {
 	int api_version;
 	bool allow_unsupported_sfp;
 	bool need_crosstalk_fix;
+	struct txgbe_devargs devarg;
 
 	uint64_t isb_dma;
 	void IOMEM *isb_mem;
diff --git a/drivers/net/txgbe/txgbe_ethdev.c b/drivers/net/txgbe/txgbe_ethdev.c
index e3c0c5d42..cc7270a1c 100644
--- a/drivers/net/txgbe/txgbe_ethdev.c
+++ b/drivers/net/txgbe/txgbe_ethdev.c
@@ -16,6 +16,7 @@ 
 #include <rte_memory.h>
 #include <rte_eal.h>
 #include <rte_alarm.h>
+#include <rte_kvargs.h>
 
 #include "txgbe_logs.h"
 #include "base/txgbe.h"
@@ -469,6 +470,71 @@  txgbe_swfw_lock_reset(struct txgbe_hw *hw)
 	hw->mac.release_swfw_sync(hw, mask);
 }
 
+static int
+txgbe_handle_devarg(__rte_unused const char *key, const char *value,
+		  void *extra_args)
+{
+	uint16_t *n = extra_args;
+
+	if (value == NULL || extra_args == NULL)
+		return -EINVAL;
+
+	*n = (uint16_t)strtoul(value, NULL, 10);
+	if (*n == USHRT_MAX && errno == ERANGE)
+		return -1;
+
+	return 0;
+}
+
+static void
+txgbe_parse_devargs(struct txgbe_hw *hw, struct rte_devargs *devargs)
+{
+	struct rte_kvargs *kvlist;
+	u16 auto_neg = 1;
+	u16 poll = 0;
+	u16 present = 1;
+	u16 sgmii = 0;
+	u16 ffe_set = 0;
+	u16 ffe_main = 27;
+	u16 ffe_pre = 8;
+	u16 ffe_post = 44;
+
+	if (devargs == NULL)
+		goto null;
+
+	kvlist = rte_kvargs_parse(devargs->args, txgbe_valid_arguments);
+	if (kvlist == NULL)
+		goto null;
+
+	rte_kvargs_process(kvlist, TXGBE_DEVARG_BP_AUTO,
+			   &txgbe_handle_devarg, &auto_neg);
+	rte_kvargs_process(kvlist, TXGBE_DEVARG_KR_POLL,
+			   &txgbe_handle_devarg, &poll);
+	rte_kvargs_process(kvlist, TXGBE_DEVARG_KR_PRESENT,
+			   &txgbe_handle_devarg, &present);
+	rte_kvargs_process(kvlist, TXGBE_DEVARG_KX_SGMII,
+			   &txgbe_handle_devarg, &sgmii);
+	rte_kvargs_process(kvlist, TXGBE_DEVARG_FFE_SET,
+			   &txgbe_handle_devarg, &ffe_set);
+	rte_kvargs_process(kvlist, TXGBE_DEVARG_FFE_MAIN,
+			   &txgbe_handle_devarg, &ffe_main);
+	rte_kvargs_process(kvlist, TXGBE_DEVARG_FFE_PRE,
+			   &txgbe_handle_devarg, &ffe_pre);
+	rte_kvargs_process(kvlist, TXGBE_DEVARG_FFE_POST,
+			   &txgbe_handle_devarg, &ffe_post);
+	rte_kvargs_free(kvlist);
+
+null:
+	hw->devarg.auto_neg = auto_neg;
+	hw->devarg.poll = poll;
+	hw->devarg.present = present;
+	hw->devarg.sgmii = sgmii;
+	hw->phy.ffe_set = ffe_set;
+	hw->phy.ffe_main = ffe_main;
+	hw->phy.ffe_pre = ffe_pre;
+	hw->phy.ffe_post = ffe_post;
+}
+
 static int
 eth_txgbe_dev_init(struct rte_eth_dev *eth_dev, void *init_params __rte_unused)
 {
@@ -537,6 +603,7 @@  eth_txgbe_dev_init(struct rte_eth_dev *eth_dev, void *init_params __rte_unused)
 	hw->isb_dma = TMZ_PADDR(mz);
 	hw->isb_mem = TMZ_VADDR(mz);
 
+	txgbe_parse_devargs(hw, pci_dev->device.devargs);
 	/* Initialize the shared code (base driver) */
 	err = txgbe_init_shared_code(hw);
 	if (err != 0) {