qed: Add VF->PF channel infrastructure

Communication between VF and PF is based on a dedicated HW channel;
VF will prepare a messge, and by signaling the HW the PF would get a
notification of that message existance. The PF would then copy the
message, process it and DMA an answer back to the VF as a response.

The messages themselves are TLV-based - allowing easier backward/forward
compatibility.

This patch adds the infrastructure of the channel on the PF side -
starting with the arrival of the notification and ending with DMAing
the response back to the VF.

It also adds a dummy-response as reference, as it only lays the
groundwork of the communication; it doesn't really add support of any
actual messages.

Signed-off-by: Yuval Mintz <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: Yuval Mintz

drivers/net/ethernet/qlogic/qed/qed.h

@@ -378,6 +378,12 @@ struct qed_hwfn {
 
 	struct qed_simd_fp_handler	simd_proto_handler[64];
 
+#ifdef CONFIG_QED_SRIOV
+	struct workqueue_struct *iov_wq;
+	struct delayed_work iov_task;
+	unsigned long iov_task_flags;
+#endif
+
 	struct z_stream_s		*stream;
 };
 

drivers/net/ethernet/qlogic/qed/qed_dev_api.h

@@ -182,11 +182,15 @@ enum qed_dmae_address_type_t {
  * used mostly to write a zeroed buffer to destination address
  * using DMA
  */
-#define QED_DMAE_FLAG_RW_REPL_SRC       0x00000001
-#define QED_DMAE_FLAG_COMPLETION_DST    0x00000008
+#define QED_DMAE_FLAG_RW_REPL_SRC	0x00000001
+#define QED_DMAE_FLAG_VF_SRC		0x00000002
+#define QED_DMAE_FLAG_VF_DST		0x00000004
+#define QED_DMAE_FLAG_COMPLETION_DST	0x00000008
 
 struct qed_dmae_params {
-	u32	flags; /* consists of QED_DMAE_FLAG_* values */
+	u32 flags; /* consists of QED_DMAE_FLAG_* values */
+	u8 src_vfid;
+	u8 dst_vfid;
 };
 
 /**
@@ -208,6 +212,23 @@ qed_dmae_host2grc(struct qed_hwfn *p_hwfn,
 		  u32 size_in_dwords,
 		  u32 flags);
 
+/**
+ * @brief qed_dmae_host2host - copy data from to source address
+ * to a destination adress (for SRIOV) using the given ptt
+ *
+ * @param p_hwfn
+ * @param p_ptt
+ * @param source_addr
+ * @param dest_addr
+ * @param size_in_dwords
+ * @param params
+ */
+int qed_dmae_host2host(struct qed_hwfn *p_hwfn,
+		       struct qed_ptt *p_ptt,
+		       dma_addr_t source_addr,
+		       dma_addr_t dest_addr,
+		       u32 size_in_dwords, struct qed_dmae_params *p_params);
+
 /**
  * @brief qed_chain_alloc - Allocate and initialize a chain
  *

drivers/net/ethernet/qlogic/qed/qed_hsi.h

@@ -31,7 +31,7 @@ enum common_event_opcode {
 	COMMON_EVENT_PF_STOP,
 	COMMON_EVENT_RESERVED,
 	COMMON_EVENT_RESERVED2,
-	COMMON_EVENT_RESERVED3,
+	COMMON_EVENT_VF_PF_CHANNEL,
 	COMMON_EVENT_RESERVED4,
 	COMMON_EVENT_RESERVED5,
 	COMMON_EVENT_RESERVED6,

drivers/net/ethernet/qlogic/qed/qed_hw.c

@@ -355,8 +355,8 @@ static void qed_dmae_opcode(struct qed_hwfn *p_hwfn,
 			    const u8 is_dst_type_grc,
 			    struct qed_dmae_params *p_params)
 {
+	u16 opcode_b = 0;
 	u32 opcode = 0;
-	u16 opcodeB = 0;
 
 	/* Whether the source is the PCIe or the GRC.
 	 * 0- The source is the PCIe
@@ -398,14 +398,24 @@ static void qed_dmae_opcode(struct qed_hwfn *p_hwfn,
 	opcode |= (DMAE_CMD_DST_ADDR_RESET_MASK <<
 		   DMAE_CMD_DST_ADDR_RESET_SHIFT);
 
-	opcodeB |= (DMAE_CMD_SRC_VF_ID_MASK <<
-		    DMAE_CMD_SRC_VF_ID_SHIFT);
+	/* SRC/DST VFID: all 1's - pf, otherwise VF id */
+	if (p_params->flags & QED_DMAE_FLAG_VF_SRC) {
+		opcode |= 1 << DMAE_CMD_SRC_VF_ID_VALID_SHIFT;
+		opcode_b |= p_params->src_vfid << DMAE_CMD_SRC_VF_ID_SHIFT;
+	} else {
+		opcode_b |= DMAE_CMD_SRC_VF_ID_MASK <<
+			    DMAE_CMD_SRC_VF_ID_SHIFT;
+	}
 
-	opcodeB |= (DMAE_CMD_DST_VF_ID_MASK <<
-		    DMAE_CMD_DST_VF_ID_SHIFT);
+	if (p_params->flags & QED_DMAE_FLAG_VF_DST) {
+		opcode |= 1 << DMAE_CMD_DST_VF_ID_VALID_SHIFT;
+		opcode_b |= p_params->dst_vfid << DMAE_CMD_DST_VF_ID_SHIFT;
+	} else {
+		opcode_b |= DMAE_CMD_DST_VF_ID_MASK << DMAE_CMD_DST_VF_ID_SHIFT;
+	}
 
 	p_hwfn->dmae_info.p_dmae_cmd->opcode = cpu_to_le32(opcode);
-	p_hwfn->dmae_info.p_dmae_cmd->opcode_b = cpu_to_le16(opcodeB);
+	p_hwfn->dmae_info.p_dmae_cmd->opcode_b = cpu_to_le16(opcode_b);
 }
 
 u32 qed_dmae_idx_to_go_cmd(u8 idx)
@@ -753,6 +763,28 @@ int qed_dmae_host2grc(struct qed_hwfn *p_hwfn,
 	return rc;
 }
 
+int
+qed_dmae_host2host(struct qed_hwfn *p_hwfn,
+		   struct qed_ptt *p_ptt,
+		   dma_addr_t source_addr,
+		   dma_addr_t dest_addr,
+		   u32 size_in_dwords, struct qed_dmae_params *p_params)
+{
+	int rc;
+
+	mutex_lock(&(p_hwfn->dmae_info.mutex));
+
+	rc = qed_dmae_execute_command(p_hwfn, p_ptt, source_addr,
+				      dest_addr,
+				      QED_DMAE_ADDRESS_HOST_PHYS,
+				      QED_DMAE_ADDRESS_HOST_PHYS,
+				      size_in_dwords, p_params);
+
+	mutex_unlock(&(p_hwfn->dmae_info.mutex));
+
+	return rc;
+}
+
 u16 qed_get_qm_pq(struct qed_hwfn *p_hwfn,
 		  enum protocol_type proto,
 		  union qed_qm_pq_params *p_params)

drivers/net/ethernet/qlogic/qed/qed_main.c

@@ -24,6 +24,7 @@
 #include <linux/qed/qed_if.h>
 
 #include "qed.h"
+#include "qed_sriov.h"
 #include "qed_sp.h"
 #include "qed_dev_api.h"
 #include "qed_mcp.h"
@@ -749,7 +750,10 @@ static int qed_slowpath_start(struct qed_dev *cdev,
 	struct qed_mcp_drv_version drv_version;
 	const u8 *data = NULL;
 	struct qed_hwfn *hwfn;
-	int rc;
+	int rc = -EINVAL;
+
+	if (qed_iov_wq_start(cdev))
+		goto err;
 
 	rc = request_firmware(&cdev->firmware, QED_FW_FILE_NAME,
 			      &cdev->pdev->dev);
@@ -826,6 +830,8 @@ static int qed_slowpath_start(struct qed_dev *cdev,
 err:
 	release_firmware(cdev->firmware);
 
+	qed_iov_wq_stop(cdev, false);
+
 	return rc;
 }
 
@@ -842,6 +848,8 @@ static int qed_slowpath_stop(struct qed_dev *cdev)
 	qed_disable_msix(cdev);
 	qed_nic_reset(cdev);
 
+	qed_iov_wq_stop(cdev, true);
+
 	release_firmware(cdev->firmware);
 
 	return 0;

drivers/net/ethernet/qlogic/qed/qed_spq.c

@@ -27,6 +27,7 @@
 #include "qed_mcp.h"
 #include "qed_reg_addr.h"
 #include "qed_sp.h"
+#include "qed_sriov.h"
 
 /***************************************************************************
 * Structures & Definitions
@@ -242,10 +243,17 @@ static int
 qed_async_event_completion(struct qed_hwfn *p_hwfn,
 			   struct event_ring_entry *p_eqe)
 {
-	DP_NOTICE(p_hwfn,
-		  "Unknown Async completion for protocol: %d\n",
-		   p_eqe->protocol_id);
-	return -EINVAL;
+	switch (p_eqe->protocol_id) {
+	case PROTOCOLID_COMMON:
+		return qed_sriov_eqe_event(p_hwfn,
+					   p_eqe->opcode,
+					   p_eqe->echo, &p_eqe->data);
+	default:
+		DP_NOTICE(p_hwfn,
+			  "Unknown Async completion for protocol: %d\n",
+			  p_eqe->protocol_id);
+		return -EINVAL;
+	}
 }
 
 /***************************************************************************