iwlwifi: add wide firmware command infrastructure for TX

As the firmware is slowly running out of command IDs and grouping of
commands is desirable anyway, the firmware is extending the command
header from 4 bytes to 8 bytes to introduce a group (in place of the
former flags field, since that's always 0 on commands and thus can
be easily used to distinguish between the two.

In order to support this most easily in the driver widen the command
command ID used in the command sending functions and encode the new
values (group and version) in the ID. That way existing code doesn't
have to be changed (since the higher bits are 0 automatically) and
newer code can easily use the new ID generation function to create a
value to use in place of just the command ID.

Signed-off-by: Aviya Erenfeld <aviya.erenfeld@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

1 files changed, 40 insertions, 13 deletions

diff --git a/drivers/net/wireless/iwlwifi/pcie/tx.c b/drivers/net/wireless/iwlwifi/pcie/tx.c
index 553ae135464a..3a5d54ed494f 100644
--- a/drivers/net/wireless/iwlwifi/pcie/tx.c
+++ b/drivers/net/wireless/iwlwifi/pcie/tx.c
@@ -1322,13 +1322,23 @@ static int iwl_pcie_enqueue_hcmd(struct iwl_trans *trans,
 	int idx;
 	u16 copy_size, cmd_size, scratch_size;
 	bool had_nocopy = false;
+	u8 group_id = iwl_cmd_groupid(cmd->id);
 	int i, ret;
 	u32 cmd_pos;
 	const u8 *cmddata[IWL_MAX_CMD_TBS_PER_TFD];
 	u16 cmdlen[IWL_MAX_CMD_TBS_PER_TFD];
 
-	copy_size = sizeof(out_cmd->hdr);
-	cmd_size = sizeof(out_cmd->hdr);
+	if (WARN(!trans_pcie->wide_cmd_header && group_id != 0,
+		 "unsupported wide command %#x\n", cmd->id))
+		return -EINVAL;
+
+	if (group_id != 0) {
+		copy_size = sizeof(struct iwl_cmd_header_wide);
+		cmd_size = sizeof(struct iwl_cmd_header_wide);
+	} else {
+		copy_size = sizeof(struct iwl_cmd_header);
+		cmd_size = sizeof(struct iwl_cmd_header);
+	}
 
 	/* need one for the header if the first is NOCOPY */
 	BUILD_BUG_ON(IWL_MAX_CMD_TBS_PER_TFD > IWL_NUM_OF_TBS - 1);
@@ -1418,16 +1428,32 @@ static int iwl_pcie_enqueue_hcmd(struct iwl_trans *trans,
 		out_meta->source = cmd;
 
 	/* set up the header */
-
-	out_cmd->hdr.cmd = cmd->id;
-	out_cmd->hdr.reserved = 0;
-	out_cmd->hdr.sequence =
-		cpu_to_le16(QUEUE_TO_SEQ(trans_pcie->cmd_queue) |
-					 INDEX_TO_SEQ(q->write_ptr));
+	if (group_id != 0) {
+		out_cmd->hdr_wide.cmd = iwl_cmd_opcode(cmd->id);
+		out_cmd->hdr_wide.group_id = group_id;
+		out_cmd->hdr_wide.version = iwl_cmd_version(cmd->id);
+		out_cmd->hdr_wide.length =
+			cpu_to_le16(cmd_size -
+				    sizeof(struct iwl_cmd_header_wide));
+		out_cmd->hdr_wide.reserved = 0;
+		out_cmd->hdr_wide.sequence =
+			cpu_to_le16(QUEUE_TO_SEQ(trans_pcie->cmd_queue) |
+						 INDEX_TO_SEQ(q->write_ptr));
+
+		cmd_pos = sizeof(struct iwl_cmd_header_wide);
+		copy_size = sizeof(struct iwl_cmd_header_wide);
+	} else {
+		out_cmd->hdr.cmd = iwl_cmd_opcode(cmd->id);
+		out_cmd->hdr.sequence =
+			cpu_to_le16(QUEUE_TO_SEQ(trans_pcie->cmd_queue) |
+						 INDEX_TO_SEQ(q->write_ptr));
+		out_cmd->hdr.group_id = 0;
+
+		cmd_pos = sizeof(struct iwl_cmd_header);
+		copy_size = sizeof(struct iwl_cmd_header);
+	}
 
 	/* and copy the data that needs to be copied */
-	cmd_pos = offsetof(struct iwl_device_cmd, payload);
-	copy_size = sizeof(out_cmd->hdr);
 	for (i = 0; i < IWL_MAX_CMD_TBS_PER_TFD; i++) {
 		int copy;
 
@@ -1466,9 +1492,10 @@ static int iwl_pcie_enqueue_hcmd(struct iwl_trans *trans,
 	}
 
 	IWL_DEBUG_HC(trans,
-		     "Sending command %s (#%x), seq: 0x%04X, %d bytes at %d[%d]:%d\n",
+		     "Sending command %s (%.2x.%.2x), seq: 0x%04X, %d bytes at %d[%d]:%d\n",
 		     get_cmd_string(trans_pcie, out_cmd->hdr.cmd),
-		     out_cmd->hdr.cmd, le16_to_cpu(out_cmd->hdr.sequence),
+		     group_id, out_cmd->hdr.cmd,
+		     le16_to_cpu(out_cmd->hdr.sequence),
 		     cmd_size, q->write_ptr, idx, trans_pcie->cmd_queue);
 
 	/* start the TFD with the scratchbuf */
@@ -1523,7 +1550,7 @@ static int iwl_pcie_enqueue_hcmd(struct iwl_trans *trans,
 		kzfree(txq->entries[idx].free_buf);
 	txq->entries[idx].free_buf = dup_buf;
 
-	trace_iwlwifi_dev_hcmd(trans->dev, cmd, cmd_size, &out_cmd->hdr);
+	trace_iwlwifi_dev_hcmd(trans->dev, cmd, cmd_size, &out_cmd->hdr_wide);
 
 	/* start timer if queue currently empty */
 	if (q->read_ptr == q->write_ptr && txq->wd_timeout)