ionic: Add adminq action

Add AdminQ specific message requests and completion handling.
Signed-off-by: Shannon Nelson <snelson@pensando.io>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/pensando/ionic/ionic.h

@@ -44,9 +44,16 @@ struct ionic {
 	DECLARE_BITMAP(intrs, IONIC_INTR_CTRL_REGS_MAX);
 };
 
+struct ionic_admin_ctx {
+	struct completion work;
+	union ionic_adminq_cmd cmd;
+	union ionic_adminq_comp comp;
+};
+
 int ionic_napi(struct napi_struct *napi, int budget, ionic_cq_cb cb,
 	       ionic_cq_done_cb done_cb, void *done_arg);
 
+int ionic_adminq_post_wait(struct ionic_lif *lif, struct ionic_admin_ctx *ctx);
 int ionic_dev_cmd_wait(struct ionic *ionic, unsigned long max_wait);
 int ionic_set_dma_mask(struct ionic *ionic);
 int ionic_setup(struct ionic *ionic);

drivers/net/ethernet/pensando/ionic/ionic_main.c

@@ -169,6 +169,117 @@ static const char *ionic_opcode_to_str(enum ionic_cmd_opcode opcode)
 	}
 }
 
+static void ionic_adminq_flush(struct ionic_lif *lif)
+{
+	struct ionic_queue *adminq = &lif->adminqcq->q;
+
+	spin_lock(&lif->adminq_lock);
+
+	while (adminq->tail != adminq->head) {
+		memset(adminq->tail->desc, 0, sizeof(union ionic_adminq_cmd));
+		adminq->tail->cb = NULL;
+		adminq->tail->cb_arg = NULL;
+		adminq->tail = adminq->tail->next;
+	}
+	spin_unlock(&lif->adminq_lock);
+}
+
+static int ionic_adminq_check_err(struct ionic_lif *lif,
+				  struct ionic_admin_ctx *ctx,
+				  bool timeout)
+{
+	struct net_device *netdev = lif->netdev;
+	const char *opcode_str;
+	const char *status_str;
+	int err = 0;
+
+	if (ctx->comp.comp.status || timeout) {
+		opcode_str = ionic_opcode_to_str(ctx->cmd.cmd.opcode);
+		status_str = ionic_error_to_str(ctx->comp.comp.status);
+		err = timeout ? -ETIMEDOUT :
+				ionic_error_to_errno(ctx->comp.comp.status);
+
+		netdev_err(netdev, "%s (%d) failed: %s (%d)\n",
+			   opcode_str, ctx->cmd.cmd.opcode,
+			   timeout ? "TIMEOUT" : status_str, err);
+
+		if (timeout)
+			ionic_adminq_flush(lif);
+	}
+
+	return err;
+}
+
+static void ionic_adminq_cb(struct ionic_queue *q,
+			    struct ionic_desc_info *desc_info,
+			    struct ionic_cq_info *cq_info, void *cb_arg)
+{
+	struct ionic_admin_ctx *ctx = cb_arg;
+	struct ionic_admin_comp *comp;
+	struct device *dev;
+
+	if (!ctx)
+		return;
+
+	comp = cq_info->cq_desc;
+	dev = &q->lif->netdev->dev;
+
+	memcpy(&ctx->comp, comp, sizeof(*comp));
+
+	dev_dbg(dev, "comp admin queue command:\n");
+	dynamic_hex_dump("comp ", DUMP_PREFIX_OFFSET, 16, 1,
+			 &ctx->comp, sizeof(ctx->comp), true);
+
+	complete_all(&ctx->work);
+}
+
+static int ionic_adminq_post(struct ionic_lif *lif, struct ionic_admin_ctx *ctx)
+{
+	struct ionic_queue *adminq = &lif->adminqcq->q;
+	int err = 0;
+
+	WARN_ON(in_interrupt());
+
+	spin_lock(&lif->adminq_lock);
+	if (!ionic_q_has_space(adminq, 1)) {
+		err = -ENOSPC;
+		goto err_out;
+	}
+
+	memcpy(adminq->head->desc, &ctx->cmd, sizeof(ctx->cmd));
+
+	dev_dbg(&lif->netdev->dev, "post admin queue command:\n");
+	dynamic_hex_dump("cmd ", DUMP_PREFIX_OFFSET, 16, 1,
+			 &ctx->cmd, sizeof(ctx->cmd), true);
+
+	ionic_q_post(adminq, true, ionic_adminq_cb, ctx);
+
+err_out:
+	spin_unlock(&lif->adminq_lock);
+
+	return err;
+}
+
+int ionic_adminq_post_wait(struct ionic_lif *lif, struct ionic_admin_ctx *ctx)
+{
+	struct net_device *netdev = lif->netdev;
+	unsigned long remaining;
+	const char *name;
+	int err;
+
+	err = ionic_adminq_post(lif, ctx);
+	if (err) {
+		name = ionic_opcode_to_str(ctx->cmd.cmd.opcode);
+		netdev_err(netdev, "Posting of %s (%d) failed: %d\n",
+			   name, ctx->cmd.cmd.opcode, err);
+		return err;
+	}
+
+	remaining = wait_for_completion_timeout(&ctx->work,
+						HZ * (ulong)DEVCMD_TIMEOUT);
+	return ionic_adminq_check_err(lif, ctx, (remaining == 0));
+}
+
 int ionic_napi(struct napi_struct *napi, int budget, ionic_cq_cb cb,
 	       ionic_cq_done_cb done_cb, void *done_arg)
 {