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Message-ID: <20240122182632.1102721-5-shailend@google.com>
Date: Mon, 22 Jan 2024 18:26:30 +0000
From: Shailend Chand <shailend@...gle.com>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net, kuba@...nel.org, Shailend Chand <shailend@...gle.com>,
Willem de Bruijn <willemb@...gle.com>, Jeroen de Borst <jeroendb@...gle.com>
Subject: [PATCH net-next 4/6] gve: Refactor gve_open and gve_close
gve_open is rewritten to be composed of two funcs: gve_queues_mem_alloc
and gve_queues_start. The former only allocates queue resources without
doing anything to install the queues, which is taken up by the latter.
Similarly gve_close is split into gve_queues_stop and
gve_queues_mem_free.
Separating the acts of queue resource allocation and making the queue
become live help with subsequent changes that aim to not take down the
datapath when applying new configurations.
Signed-off-by: Shailend Chand <shailend@...gle.com>
Reviewed-by: Willem de Bruijn <willemb@...gle.com>
Reviewed-by: Jeroen de Borst <jeroendb@...gle.com>
---
drivers/net/ethernet/google/gve/gve_main.c | 159 +++++++++++++++------
1 file changed, 119 insertions(+), 40 deletions(-)
diff --git a/drivers/net/ethernet/google/gve/gve_main.c b/drivers/net/ethernet/google/gve/gve_main.c
index 8049a47c38fc..3515484e4cea 100644
--- a/drivers/net/ethernet/google/gve/gve_main.c
+++ b/drivers/net/ethernet/google/gve/gve_main.c
@@ -1350,45 +1350,99 @@ static void gve_rx_stop_rings(struct gve_priv *priv, int num_rings)
}
}
-static int gve_open(struct net_device *dev)
+static void gve_queues_mem_free(struct gve_priv *priv,
+ struct gve_qpls_alloc_cfg *qpls_alloc_cfg,
+ struct gve_tx_alloc_rings_cfg *tx_alloc_cfg,
+ struct gve_rx_alloc_rings_cfg *rx_alloc_cfg)
+{
+ gve_free_rings(priv, tx_alloc_cfg, rx_alloc_cfg);
+ gve_free_qpls(priv, qpls_alloc_cfg);
+}
+
+static int gve_queues_mem_alloc(struct gve_priv *priv,
+ struct gve_qpls_alloc_cfg *qpls_alloc_cfg,
+ struct gve_tx_alloc_rings_cfg *tx_alloc_cfg,
+ struct gve_rx_alloc_rings_cfg *rx_alloc_cfg)
+{
+ int err;
+
+ err = gve_alloc_qpls(priv, qpls_alloc_cfg);
+ if (err) {
+ netif_err(priv, drv, priv->dev, "Failed to alloc QPLs\n");
+ return err;
+ }
+ tx_alloc_cfg->qpls = qpls_alloc_cfg->qpls;
+ rx_alloc_cfg->qpls = qpls_alloc_cfg->qpls;
+ err = gve_alloc_rings(priv, tx_alloc_cfg, rx_alloc_cfg);
+ if (err) {
+ netif_err(priv, drv, priv->dev, "Failed to alloc rings\n");
+ goto free_qpls;
+ }
+
+ return 0;
+
+free_qpls:
+ gve_free_qpls(priv, qpls_alloc_cfg);
+ return err;
+}
+
+static void gve_queues_mem_remove(struct gve_priv *priv)
{
struct gve_tx_alloc_rings_cfg tx_alloc_cfg = {0};
struct gve_rx_alloc_rings_cfg rx_alloc_cfg = {0};
struct gve_qpls_alloc_cfg qpls_alloc_cfg = {0};
- struct gve_priv *priv = netdev_priv(dev);
+
+ gve_get_curr_alloc_cfgs(priv, &qpls_alloc_cfg,
+ &tx_alloc_cfg, &rx_alloc_cfg);
+ gve_queues_mem_free(priv, &qpls_alloc_cfg,
+ &tx_alloc_cfg, &rx_alloc_cfg);
+ priv->qpls = NULL;
+ priv->tx = NULL;
+ priv->rx = NULL;
+}
+
+/* The passed-in queue memory is stored into priv and the queues are made live.
+ * No memory is allocated. Passed-in memory is freed on errors.
+ */
+static int gve_queues_start(struct gve_priv *priv,
+ struct gve_qpls_alloc_cfg *qpls_alloc_cfg,
+ struct gve_tx_alloc_rings_cfg *tx_alloc_cfg,
+ struct gve_rx_alloc_rings_cfg *rx_alloc_cfg)
+{
+ struct net_device *dev = priv->dev;
int err;
+ /* Record new resources into priv */
+ priv->qpls = qpls_alloc_cfg->qpls;
+ priv->tx = tx_alloc_cfg->tx;
+ priv->rx = rx_alloc_cfg->rx;
+
+ /* Record new configs into priv */
+ priv->qpl_cfg = *qpls_alloc_cfg->qpl_cfg;
+ priv->tx_cfg = *tx_alloc_cfg->qcfg;
+ priv->rx_cfg = *rx_alloc_cfg->qcfg;
+ priv->tx_desc_cnt = tx_alloc_cfg->ring_size;
+ priv->rx_desc_cnt = rx_alloc_cfg->ring_size;
+
if (priv->xdp_prog)
priv->num_xdp_queues = priv->rx_cfg.num_queues;
else
priv->num_xdp_queues = 0;
- gve_get_curr_alloc_cfgs(priv, &qpls_alloc_cfg,
- &tx_alloc_cfg, &rx_alloc_cfg);
- err = gve_alloc_qpls(priv, &qpls_alloc_cfg);
- if (err)
- return err;
- priv->qpls = qpls_alloc_cfg.qpls;
- tx_alloc_cfg.qpls = priv->qpls;
- rx_alloc_cfg.qpls = priv->qpls;
- err = gve_alloc_rings(priv, &tx_alloc_cfg, &rx_alloc_cfg);
- if (err)
- goto free_qpls;
-
- gve_tx_start_rings(priv, 0, tx_alloc_cfg.num_rings);
- gve_rx_start_rings(priv, rx_alloc_cfg.qcfg->num_queues);
+ gve_tx_start_rings(priv, 0, tx_alloc_cfg->num_rings);
+ gve_rx_start_rings(priv, rx_alloc_cfg->qcfg->num_queues);
gve_init_sync_stats(priv);
err = netif_set_real_num_tx_queues(dev, priv->tx_cfg.num_queues);
if (err)
- goto free_rings;
+ goto stop_and_free_rings;
err = netif_set_real_num_rx_queues(dev, priv->rx_cfg.num_queues);
if (err)
- goto free_rings;
+ goto stop_and_free_rings;
err = gve_reg_xdp_info(priv, dev);
if (err)
- goto free_rings;
+ goto stop_and_free_rings;
err = gve_register_qpls(priv);
if (err)
@@ -1416,29 +1470,22 @@ static int gve_open(struct net_device *dev)
priv->interface_up_cnt++;
return 0;
-free_rings:
- gve_tx_stop_rings(priv, 0, tx_alloc_cfg.num_rings);
- gve_rx_stop_rings(priv, rx_alloc_cfg.qcfg->num_queues);
- gve_free_rings(priv, &tx_alloc_cfg, &rx_alloc_cfg);
-free_qpls:
- gve_free_qpls(priv, &qpls_alloc_cfg);
- return err;
-
reset:
- /* This must have been called from a reset due to the rtnl lock
- * so just return at this point.
- */
if (gve_get_reset_in_progress(priv))
- return err;
- /* Otherwise reset before returning */
+ goto stop_and_free_rings;
gve_reset_and_teardown(priv, true);
/* if this fails there is nothing we can do so just ignore the return */
gve_reset_recovery(priv, false);
/* return the original error */
return err;
+stop_and_free_rings:
+ gve_tx_stop_rings(priv, 0, gve_num_tx_queues(priv));
+ gve_rx_stop_rings(priv, priv->rx_cfg.num_queues);
+ gve_queues_mem_remove(priv);
+ return err;
}
-static int gve_close(struct net_device *dev)
+static int gve_open(struct net_device *dev)
{
struct gve_tx_alloc_rings_cfg tx_alloc_cfg = {0};
struct gve_rx_alloc_rings_cfg rx_alloc_cfg = {0};
@@ -1446,7 +1493,30 @@ static int gve_close(struct net_device *dev)
struct gve_priv *priv = netdev_priv(dev);
int err;
- netif_carrier_off(dev);
+ gve_get_curr_alloc_cfgs(priv, &qpls_alloc_cfg,
+ &tx_alloc_cfg, &rx_alloc_cfg);
+
+ err = gve_queues_mem_alloc(priv, &qpls_alloc_cfg,
+ &tx_alloc_cfg, &rx_alloc_cfg);
+ if (err)
+ return err;
+
+ /* No need to free on error: ownership of resources is lost after
+ * calling gve_queues_start.
+ */
+ err = gve_queues_start(priv, &qpls_alloc_cfg,
+ &tx_alloc_cfg, &rx_alloc_cfg);
+ if (err)
+ return err;
+
+ return 0;
+}
+
+static int gve_queues_stop(struct gve_priv *priv)
+{
+ int err;
+
+ netif_carrier_off(priv->dev);
if (gve_get_device_rings_ok(priv)) {
gve_turndown(priv);
gve_drain_page_cache(priv);
@@ -1462,12 +1532,8 @@ static int gve_close(struct net_device *dev)
gve_unreg_xdp_info(priv);
- gve_get_curr_alloc_cfgs(priv, &qpls_alloc_cfg,
- &tx_alloc_cfg, &rx_alloc_cfg);
- gve_tx_stop_rings(priv, 0, tx_alloc_cfg.num_rings);
- gve_rx_stop_rings(priv, rx_alloc_cfg.qcfg->num_queues);
- gve_free_rings(priv, &tx_alloc_cfg, &rx_alloc_cfg);
- gve_free_qpls(priv, &qpls_alloc_cfg);
+ gve_tx_stop_rings(priv, 0, gve_num_tx_queues(priv));
+ gve_rx_stop_rings(priv, priv->rx_cfg.num_queues);
priv->interface_down_cnt++;
return 0;
@@ -1483,6 +1549,19 @@ static int gve_close(struct net_device *dev)
return gve_reset_recovery(priv, false);
}
+static int gve_close(struct net_device *dev)
+{
+ struct gve_priv *priv = netdev_priv(dev);
+ int err;
+
+ err = gve_queues_stop(priv);
+ if (err)
+ return err;
+
+ gve_queues_mem_remove(priv);
+ return 0;
+}
+
static int gve_remove_xdp_queues(struct gve_priv *priv)
{
int qpl_start_id;
--
2.43.0.429.g432eaa2c6b-goog
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