ice: add functions to get and set Tx queue context

The live migration driver will need to save and restore the Tx queue
context state from the hardware registers. This state contains both static
fields which do not change during Tx traffic as well as dynamic fields
which may change during Tx traffic.

Unlike the Rx context, the Tx queue context is accessed indirectly from
GLCOMM_QTX_CNTX_CTL and GLCOMM_QTX_CNTX_DATA registers. These registers are
shared by multiple PFs on the same PCIe card. Multiple PFs cannot safely
access the registers simultaneously, and there is no hardware semaphore or
logic to control access. To handle this, introduce the txq_ctx_lock to the
ice_adapter structure. This is similar to the ptp_gltsyn_time_lock. All PFs
on the same adapter share this structure, and use it to serialize access to
the registers to prevent error.

Add a new functions to get and set the Tx queue context through the
GLCOMM_QTX_CNTX_CTL interface. The hardware context values are stored in
the registers using the same packed format as the Admin Queue buffer.

The hardware buffer is 40 bytes wide, as it contains an additional 18 bytes
of internal state not sent with the Admin Queue buffer. For this reason, a
separate typedef and packing function must be used. We can share the same
packed fields definitions because we never need to unpack the internal
state. This is preferred, as it ensures the internal state is zero'd when
writing into HW, and avoids issues with reading by u32 registers into a
buffer of 22 bytes in length. Thanks to the typedefs, misuse of the API
with the wrong size buffer can easily be caught at compile time.

Note reading this data from hardware is essential because the current Tx
queue context may be different from the context as initially programmed by
the driver during VF initialization. When migrating a VF we must ensure the
target VF has identical context as the source VF did.

Co-developed-by: Yahui Cao <yahui.cao@intel.com>
Signed-off-by: Yahui Cao <yahui.cao@intel.com>
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Reviewed-by: Madhu Chittim <madhu.chittim@intel.com>
Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/ice/ice_hw_autogen.h b/drivers/net/ethernet/intel/ice/ice_hw_autogen.h
index aa4bfbcf85d2..dd520aa4d1d6 100644
--- a/drivers/net/ethernet/intel/ice/ice_hw_autogen.h
+++ b/drivers/net/ethernet/intel/ice/ice_hw_autogen.h
@@ -16,6 +16,7 @@
 #define GLCOMM_QUANTA_PROF_MAX_DESC_M		ICE_M(0x3F, 24)
 #define QTX_COMM_DBELL(_DBQM)			(0x002C0000 + ((_DBQM) * 4))
 #define QTX_COMM_HEAD(_DBQM)			(0x000E0000 + ((_DBQM) * 4))
+#define QTX_COMM_HEAD_MAX_INDEX			16383
 #define QTX_COMM_HEAD_HEAD_S			0
 #define QTX_COMM_HEAD_HEAD_M			ICE_M(0x1FFF, 0)
 #define PF_FW_ARQBAH				0x00080180
@@ -272,6 +273,8 @@
 #define VPINT_ALLOC_PCI_VALID_M			BIT(31)
 #define VPINT_MBX_CTL(_VSI)			(0x0016A000 + ((_VSI) * 4))
 #define VPINT_MBX_CTL_CAUSE_ENA_M		BIT(30)
+#define PFLAN_TX_QALLOC(_PF)			(0x001D2580 + ((_PF) * 4))
+#define PFLAN_TX_QALLOC_FIRSTQ_M		GENMASK(13, 0)
 #define GLLAN_RCTL_0				0x002941F8
 #define QRX_CONTEXT(_i, _QRX)			(0x00280000 + ((_i) * 8192 + (_QRX) * 4))
 #define QRX_CTRL(_QRX)				(0x00120000 + ((_QRX) * 4))
@@ -376,6 +379,15 @@
 #define GLNVM_ULD_POR_DONE_1_M			BIT(8)
 #define GLNVM_ULD_PCIER_DONE_2_M		BIT(9)
 #define GLNVM_ULD_PE_DONE_M			BIT(10)
+#define GLCOMM_QTX_CNTX_CTL			0x002D2DC8
+#define GLCOMM_QTX_CNTX_CTL_QUEUE_ID_M		GENMASK(13, 0)
+#define GLCOMM_QTX_CNTX_CTL_CMD_M		GENMASK(18, 16)
+#define GLCOMM_QTX_CNTX_CTL_CMD_READ		0
+#define GLCOMM_QTX_CNTX_CTL_CMD_WRITE		1
+#define GLCOMM_QTX_CNTX_CTL_CMD_RESET		3
+#define GLCOMM_QTX_CNTX_CTL_CMD_WRITE_NO_DYN	4
+#define GLCOMM_QTX_CNTX_CTL_CMD_EXEC_M		BIT(19)
+#define GLCOMM_QTX_CNTX_DATA(_i)		(0x002D2D40 + ((_i) * 4))
 #define GLPCI_CNF2				0x000BE004
 #define GLPCI_CNF2_CACHELINE_SIZE_M		BIT(1)
 #define PF_FUNC_RID				0x0009E880