Merge branch '100GbE' of git://git.kernel.org/pub/scm/linux/kernel/git/tnguy/next-queue

Tony Nguyen says:

====================
ice: cleanups and preparation for live migration

Jake Keller says:

Various cleanups and preparation to the ice driver code for supporting
SR-IOV live migration.

The logic for unpacking Rx queue context data is added. This is the inverse
of the existing packing logic. Thanks to <linux/packing.h> this is trivial
to add.

Code to enable both reading and writing the Tx queue context for a queue
over a shared hardware register interface is added. Thanks to ice_adapter,
this is locked across all PFs that need to use it, preventing concurrency
issues with multiple PFs.

The RSS hash configuration requested by a VF is cached within the VF
structure. This will be used to track and restore the same configuration
during migration load.

ice_sriov_set_msix_vec_count() is updated to use pci_iov_vf_id() instead of
open-coding a worse equivalent, and checks to avoid rebuilding MSI-X if the
current request is for the existing amount of vectors.

A new ice_get_vf_by_dev() helper function is added to simplify accessing a
VF from its PCI device structure. This will be used more heavily within the
live migration code itself.

* '100GbE' of git://git.kernel.org/pub/scm/linux/kernel/git/tnguy/next-queue:
  ice: introduce ice_get_vf_by_dev() wrapper
  ice: avoid rebuilding if MSI-X vector count is unchanged
  ice: use pci_iov_vf_id() to get VF ID
  ice: expose VF functions used by live migration
  ice: move ice_vsi_update_l2tsel to ice_lib.c
  ice: save RSS hash configuration for migration
  ice: add functions to get and set Tx queue context
  ice: add support for reading and unpacking Rx queue context
====================

Link: https://patch.msgid.link/20250710214518.1824208-1-anthony.l.nguyen@intel.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

1 files changed, 230 insertions, 3 deletions

diff --git a/drivers/net/ethernet/intel/ice/ice_common.c b/drivers/net/ethernet/intel/ice/ice_common.c
index 84cd8c6dcf39..1b435e108d3c 100644
--- a/drivers/net/ethernet/intel/ice/ice_common.c
+++ b/drivers/net/ethernet/intel/ice/ice_common.c
@@ -1342,6 +1342,26 @@ static void ice_copy_rxq_ctx_to_hw(struct ice_hw *hw,
 	}
 }
 
+/**
+ * ice_copy_rxq_ctx_from_hw - Copy packed Rx Queue context from HW registers
+ * @hw: pointer to the hardware structure
+ * @rxq_ctx: pointer to the packed Rx queue context
+ * @rxq_index: the index of the Rx queue
+ */
+static void ice_copy_rxq_ctx_from_hw(struct ice_hw *hw,
+				     ice_rxq_ctx_buf_t *rxq_ctx,
+				     u32 rxq_index)
+{
+	u32 *ctx = (u32 *)rxq_ctx;
+
+	/* Copy each dword separately from HW */
+	for (int i = 0; i < ICE_RXQ_CTX_SIZE_DWORDS; i++, ctx++) {
+		*ctx = rd32(hw, QRX_CONTEXT(i, rxq_index));
+
+		ice_debug(hw, ICE_DBG_QCTX, "qrxdata[%d]: %08X\n", i, *ctx);
+	}
+}
+
 #define ICE_CTX_STORE(struct_name, struct_field, width, lsb) \
 	PACKED_FIELD((lsb) + (width) - 1, (lsb), struct struct_name, struct_field)
 
@@ -1386,6 +1406,21 @@ static void ice_pack_rxq_ctx(const struct ice_rlan_ctx *ctx,
 }
 
 /**
+ * ice_unpack_rxq_ctx - Unpack Rx queue context from a HW buffer
+ * @buf: the HW buffer to unpack from
+ * @ctx: the Rx queue context to unpack
+ *
+ * Unpack the Rx queue context from the HW buffer into the CPU-friendly
+ * structure.
+ */
+static void ice_unpack_rxq_ctx(const ice_rxq_ctx_buf_t *buf,
+			       struct ice_rlan_ctx *ctx)
+{
+	unpack_fields(buf, sizeof(*buf), ctx, ice_rlan_ctx_fields,
+		      QUIRK_LITTLE_ENDIAN | QUIRK_LSW32_IS_FIRST);
+}
+
+/**
  * ice_write_rxq_ctx - Write Rx Queue context to hardware
  * @hw: pointer to the hardware structure
  * @rlan_ctx: pointer to the unpacked Rx queue context
@@ -1410,6 +1445,31 @@ int ice_write_rxq_ctx(struct ice_hw *hw, struct ice_rlan_ctx *rlan_ctx,
 	return 0;
 }
 
+/**
+ * ice_read_rxq_ctx - Read Rx queue context from HW
+ * @hw: pointer to the hardware structure
+ * @rlan_ctx: pointer to the Rx queue context
+ * @rxq_index: the index of the Rx queue
+ *
+ * Read the Rx queue context from the hardware registers, and unpack it into
+ * the sparse Rx queue context structure.
+ *
+ * Returns: 0 on success, or -EINVAL if the Rx queue index is invalid.
+ */
+int ice_read_rxq_ctx(struct ice_hw *hw, struct ice_rlan_ctx *rlan_ctx,
+		     u32 rxq_index)
+{
+	ice_rxq_ctx_buf_t buf = {};
+
+	if (rxq_index > QRX_CTRL_MAX_INDEX)
+		return -EINVAL;
+
+	ice_copy_rxq_ctx_from_hw(hw, &buf, rxq_index);
+	ice_unpack_rxq_ctx(&buf, rlan_ctx);
+
+	return 0;
+}
+
 /* LAN Tx Queue Context */
 static const struct packed_field_u8 ice_tlan_ctx_fields[] = {
 				    /* Field			Width	LSB */
@@ -1443,12 +1503,12 @@ static const struct packed_field_u8 ice_tlan_ctx_fields[] = {
 };
 
 /**
- * ice_pack_txq_ctx - Pack Tx queue context into a HW buffer
+ * ice_pack_txq_ctx - Pack Tx queue context into Admin Queue buffer
  * @ctx: the Tx queue context to pack
- * @buf: the HW buffer to pack into
+ * @buf: the Admin Queue HW buffer to pack into
  *
  * Pack the Tx queue context from the CPU-friendly unpacked buffer into its
- * bit-packed HW layout.
+ * bit-packed Admin Queue layout.
  */
 void ice_pack_txq_ctx(const struct ice_tlan_ctx *ctx, ice_txq_ctx_buf_t *buf)
 {
@@ -1456,6 +1516,173 @@ void ice_pack_txq_ctx(const struct ice_tlan_ctx *ctx, ice_txq_ctx_buf_t *buf)
 		    QUIRK_LITTLE_ENDIAN | QUIRK_LSW32_IS_FIRST);
 }
 
+/**
+ * ice_pack_txq_ctx_full - Pack Tx queue context into a HW buffer
+ * @ctx: the Tx queue context to pack
+ * @buf: the HW buffer to pack into
+ *
+ * Pack the Tx queue context from the CPU-friendly unpacked buffer into its
+ * bit-packed HW layout, including the internal data portion.
+ */
+static void ice_pack_txq_ctx_full(const struct ice_tlan_ctx *ctx,
+				  ice_txq_ctx_buf_full_t *buf)
+{
+	pack_fields(buf, sizeof(*buf), ctx, ice_tlan_ctx_fields,
+		    QUIRK_LITTLE_ENDIAN | QUIRK_LSW32_IS_FIRST);
+}
+
+/**
+ * ice_unpack_txq_ctx_full - Unpack Tx queue context from a HW buffer
+ * @buf: the HW buffer to unpack from
+ * @ctx: the Tx queue context to unpack
+ *
+ * Unpack the Tx queue context from the HW buffer (including the full internal
+ * state) into the CPU-friendly structure.
+ */
+static void ice_unpack_txq_ctx_full(const ice_txq_ctx_buf_full_t *buf,
+				    struct ice_tlan_ctx *ctx)
+{
+	unpack_fields(buf, sizeof(*buf), ctx, ice_tlan_ctx_fields,
+		      QUIRK_LITTLE_ENDIAN | QUIRK_LSW32_IS_FIRST);
+}
+
+/**
+ * ice_copy_txq_ctx_from_hw - Copy Tx Queue context from HW registers
+ * @hw: pointer to the hardware structure
+ * @txq_ctx: pointer to the packed Tx queue context, including internal state
+ * @txq_index: the index of the Tx queue
+ *
+ * Copy Tx Queue context from HW register space to dense structure
+ */
+static void ice_copy_txq_ctx_from_hw(struct ice_hw *hw,
+				     ice_txq_ctx_buf_full_t *txq_ctx,
+				     u32 txq_index)
+{
+	struct ice_pf *pf = container_of(hw, struct ice_pf, hw);
+	u32 *ctx = (u32 *)txq_ctx;
+	u32 txq_base, reg;
+
+	/* Get Tx queue base within card space */
+	txq_base = rd32(hw, PFLAN_TX_QALLOC(hw->pf_id));
+	txq_base = FIELD_GET(PFLAN_TX_QALLOC_FIRSTQ_M, txq_base);
+
+	reg = FIELD_PREP(GLCOMM_QTX_CNTX_CTL_CMD_M,
+			 GLCOMM_QTX_CNTX_CTL_CMD_READ) |
+	      FIELD_PREP(GLCOMM_QTX_CNTX_CTL_QUEUE_ID_M,
+			 txq_base + txq_index) |
+	      GLCOMM_QTX_CNTX_CTL_CMD_EXEC_M;
+
+	/* Prevent other PFs on the same adapter from accessing the Tx queue
+	 * context interface concurrently.
+	 */
+	spin_lock(&pf->adapter->txq_ctx_lock);
+
+	wr32(hw, GLCOMM_QTX_CNTX_CTL, reg);
+	ice_flush(hw);
+
+	/* Copy each dword separately from HW */
+	for (int i = 0; i < ICE_TXQ_CTX_FULL_SIZE_DWORDS; i++, ctx++) {
+		*ctx = rd32(hw, GLCOMM_QTX_CNTX_DATA(i));
+
+		ice_debug(hw, ICE_DBG_QCTX, "qtxdata[%d]: %08X\n", i, *ctx);
+	}
+
+	spin_unlock(&pf->adapter->txq_ctx_lock);
+}
+
+/**
+ * ice_copy_txq_ctx_to_hw - Copy Tx Queue context into HW registers
+ * @hw: pointer to the hardware structure
+ * @txq_ctx: pointer to the packed Tx queue context, including internal state
+ * @txq_index: the index of the Tx queue
+ */
+static void ice_copy_txq_ctx_to_hw(struct ice_hw *hw,
+				   const ice_txq_ctx_buf_full_t *txq_ctx,
+				   u32 txq_index)
+{
+	struct ice_pf *pf = container_of(hw, struct ice_pf, hw);
+	u32 txq_base, reg;
+
+	/* Get Tx queue base within card space */
+	txq_base = rd32(hw, PFLAN_TX_QALLOC(hw->pf_id));
+	txq_base = FIELD_GET(PFLAN_TX_QALLOC_FIRSTQ_M, txq_base);
+
+	reg = FIELD_PREP(GLCOMM_QTX_CNTX_CTL_CMD_M,
+			 GLCOMM_QTX_CNTX_CTL_CMD_WRITE_NO_DYN) |
+	      FIELD_PREP(GLCOMM_QTX_CNTX_CTL_QUEUE_ID_M,
+			 txq_base + txq_index) |
+	      GLCOMM_QTX_CNTX_CTL_CMD_EXEC_M;
+
+	/* Prevent other PFs on the same adapter from accessing the Tx queue
+	 * context interface concurrently.
+	 */
+	spin_lock(&pf->adapter->txq_ctx_lock);
+
+	/* Copy each dword separately to HW */
+	for (int i = 0; i < ICE_TXQ_CTX_FULL_SIZE_DWORDS; i++) {
+		u32 ctx = ((const u32 *)txq_ctx)[i];
+
+		wr32(hw, GLCOMM_QTX_CNTX_DATA(i), ctx);
+
+		ice_debug(hw, ICE_DBG_QCTX, "qtxdata[%d]: %08X\n", i, ctx);
+	}
+
+	wr32(hw, GLCOMM_QTX_CNTX_CTL, reg);
+	ice_flush(hw);
+
+	spin_unlock(&pf->adapter->txq_ctx_lock);
+}
+
+/**
+ * ice_read_txq_ctx - Read Tx queue context from HW
+ * @hw: pointer to the hardware structure
+ * @tlan_ctx: pointer to the Tx queue context
+ * @txq_index: the index of the Tx queue
+ *
+ * Read the Tx queue context from the HW registers, then unpack it into the
+ * ice_tlan_ctx structure for use.
+ *
+ * Returns: 0 on success, or -EINVAL on an invalid Tx queue index.
+ */
+int ice_read_txq_ctx(struct ice_hw *hw, struct ice_tlan_ctx *tlan_ctx,
+		     u32 txq_index)
+{
+	ice_txq_ctx_buf_full_t buf = {};
+
+	if (txq_index > QTX_COMM_HEAD_MAX_INDEX)
+		return -EINVAL;
+
+	ice_copy_txq_ctx_from_hw(hw, &buf, txq_index);
+	ice_unpack_txq_ctx_full(&buf, tlan_ctx);
+
+	return 0;
+}
+
+/**
+ * ice_write_txq_ctx - Write Tx queue context to HW
+ * @hw: pointer to the hardware structure
+ * @tlan_ctx: pointer to the Tx queue context
+ * @txq_index: the index of the Tx queue
+ *
+ * Pack the Tx queue context into the dense HW layout, then write it into the
+ * HW registers.
+ *
+ * Returns: 0 on success, or -EINVAL on an invalid Tx queue index.
+ */
+int ice_write_txq_ctx(struct ice_hw *hw, struct ice_tlan_ctx *tlan_ctx,
+		      u32 txq_index)
+{
+	ice_txq_ctx_buf_full_t buf = {};
+
+	if (txq_index > QTX_COMM_HEAD_MAX_INDEX)
+		return -EINVAL;
+
+	ice_pack_txq_ctx_full(tlan_ctx, &buf);
+	ice_copy_txq_ctx_to_hw(hw, &buf, txq_index);
+
+	return 0;
+}
+
 /* Sideband Queue command wrappers */
 
 /**