gve: merge packet buffer size fields

The data_buffer_size_dqo field in gve_priv and the packet_buffer_size
field in gve_rx_ring theoretically have the same meaning, but they are
defined in two different places and used in two separate contexts. There
is no good reason for this, so this change merges those fields into the
packet_buffer_size field in the RX ring.

This change also introduces a packet_buffer_size field to struct
gve_rx_queue_config to account for cases where queues are not allocated,
such as when the interface is down.

Reviewed-by: Willem de Bruijn <[email protected]>
Signed-off-by: Joshua Washington <[email protected]>
Signed-off-by: Harshitha Ramamurthy <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

Author: josh8551021

drivers/net/ethernet/google/gve/gve.h

@@ -227,6 +227,7 @@ struct gve_rx_cnts {
 /* Contains datapath state used to represent an RX queue. */
 struct gve_rx_ring {
 	struct gve_priv *gve;
+	u16 packet_buffer_size;
 	union {
 		/* GQI fields */
 		struct {
@@ -235,7 +236,6 @@ struct gve_rx_ring {
 
 			/* threshold for posting new buffs and descs */
 			u32 db_threshold;
-			u16 packet_buffer_size;
 
 			u32 qpl_copy_pool_mask;
 			u32 qpl_copy_pool_head;
@@ -635,6 +635,7 @@ struct gve_notify_block {
 struct gve_rx_queue_config {
 	u16 max_queues;
 	u16 num_queues;
+	u16 packet_buffer_size;
 };
 
 /* Tracks allowed and current tx queue settings */
@@ -842,7 +843,6 @@ struct gve_priv {
 	struct gve_ptype_lut *ptype_lut_dqo;
 
 	/* Must be a power of two. */
-	u16 data_buffer_size_dqo;
 	u16 max_rx_buffer_size; /* device limit */
 
 	enum gve_queue_format queue_format;

drivers/net/ethernet/google/gve/gve_adminq.c

@@ -731,6 +731,7 @@ static void gve_adminq_get_create_rx_queue_cmd(struct gve_priv *priv,
 		.ntfy_id = cpu_to_be32(rx->ntfy_id),
 		.queue_resources_addr = cpu_to_be64(rx->q_resources_bus),
 		.rx_ring_size = cpu_to_be16(priv->rx_desc_cnt),
+		.packet_buffer_size = cpu_to_be16(rx->packet_buffer_size),
 	};
 
 	if (gve_is_gqi(priv)) {
@@ -743,7 +744,6 @@ static void gve_adminq_get_create_rx_queue_cmd(struct gve_priv *priv,
 			cpu_to_be64(rx->data.data_bus);
 		cmd->create_rx_queue.index = cpu_to_be32(queue_index);
 		cmd->create_rx_queue.queue_page_list_id = cpu_to_be32(qpl_id);
-		cmd->create_rx_queue.packet_buffer_size = cpu_to_be16(rx->packet_buffer_size);
 	} else {
 		u32 qpl_id = 0;
 
@@ -756,8 +756,6 @@ static void gve_adminq_get_create_rx_queue_cmd(struct gve_priv *priv,
 			cpu_to_be64(rx->dqo.complq.bus);
 		cmd->create_rx_queue.rx_data_ring_addr =
 			cpu_to_be64(rx->dqo.bufq.bus);
-		cmd->create_rx_queue.packet_buffer_size =
-			cpu_to_be16(priv->data_buffer_size_dqo);
 		cmd->create_rx_queue.rx_buff_ring_size =
 			cpu_to_be16(priv->rx_desc_cnt);
 		cmd->create_rx_queue.enable_rsc =

drivers/net/ethernet/google/gve/gve_buffer_mgmt_dqo.c

@@ -139,7 +139,7 @@ int gve_alloc_qpl_page_dqo(struct gve_rx_ring *rx,
 	buf_state->page_info.page_offset = 0;
 	buf_state->page_info.page_address =
 		page_address(buf_state->page_info.page);
-	buf_state->page_info.buf_size = priv->data_buffer_size_dqo;
+	buf_state->page_info.buf_size = rx->packet_buffer_size;
 	buf_state->last_single_ref_offset = 0;
 
 	/* The page already has 1 ref. */
@@ -162,7 +162,7 @@ void gve_free_qpl_page_dqo(struct gve_rx_buf_state_dqo *buf_state)
 void gve_try_recycle_buf(struct gve_priv *priv, struct gve_rx_ring *rx,
 			 struct gve_rx_buf_state_dqo *buf_state)
 {
-	const u16 data_buffer_size = priv->data_buffer_size_dqo;
+	const u16 data_buffer_size = rx->packet_buffer_size;
 	int pagecount;
 
 	/* Can't reuse if we only fit one buffer per page */
@@ -217,10 +217,9 @@ void gve_free_to_page_pool(struct gve_rx_ring *rx,
 static int gve_alloc_from_page_pool(struct gve_rx_ring *rx,
 				    struct gve_rx_buf_state_dqo *buf_state)
 {
-	struct gve_priv *priv = rx->gve;
 	netmem_ref netmem;
 
-	buf_state->page_info.buf_size = priv->data_buffer_size_dqo;
+	buf_state->page_info.buf_size = rx->packet_buffer_size;
 	netmem = page_pool_alloc_netmem(rx->dqo.page_pool,
 					&buf_state->page_info.page_offset,
 					&buf_state->page_info.buf_size,

drivers/net/ethernet/google/gve/gve_ethtool.c

@@ -647,8 +647,7 @@ static int gve_set_tunable(struct net_device *netdev,
 	switch (etuna->id) {
 	case ETHTOOL_RX_COPYBREAK:
 	{
-		u32 max_copybreak = gve_is_gqi(priv) ?
-			GVE_DEFAULT_RX_BUFFER_SIZE : priv->data_buffer_size_dqo;
+		u32 max_copybreak = priv->rx_cfg.packet_buffer_size;
 
 		len = *(u32 *)value;
 		if (len > max_copybreak)

drivers/net/ethernet/google/gve/gve_main.c

@@ -1224,9 +1224,7 @@ static void gve_rx_get_curr_alloc_cfg(struct gve_priv *priv,
 	cfg->raw_addressing = !gve_is_qpl(priv);
 	cfg->enable_header_split = priv->header_split_enabled;
 	cfg->ring_size = priv->rx_desc_cnt;
-	cfg->packet_buffer_size = gve_is_gqi(priv) ?
-				  GVE_DEFAULT_RX_BUFFER_SIZE :
-				  priv->data_buffer_size_dqo;
+	cfg->packet_buffer_size = priv->rx_cfg.packet_buffer_size;
 	cfg->rx = priv->rx;
 }
 
@@ -1331,7 +1329,7 @@ static int gve_queues_start(struct gve_priv *priv,
 		goto reset;
 
 	priv->header_split_enabled = rx_alloc_cfg->enable_header_split;
-	priv->data_buffer_size_dqo = rx_alloc_cfg->packet_buffer_size;
+	priv->rx_cfg.packet_buffer_size = rx_alloc_cfg->packet_buffer_size;
 
 	err = gve_create_rings(priv);
 	if (err)
@@ -2627,7 +2625,7 @@ static int gve_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	priv->service_task_flags = 0x0;
 	priv->state_flags = 0x0;
 	priv->ethtool_flags = 0x0;
-	priv->data_buffer_size_dqo = GVE_DEFAULT_RX_BUFFER_SIZE;
+	priv->rx_cfg.packet_buffer_size = GVE_DEFAULT_RX_BUFFER_SIZE;
 	priv->max_rx_buffer_size = GVE_DEFAULT_RX_BUFFER_SIZE;
 
 	gve_set_probe_in_progress(priv);

drivers/net/ethernet/google/gve/gve_rx.c

@@ -288,7 +288,7 @@ int gve_rx_alloc_ring_gqi(struct gve_priv *priv,
 
 	rx->gve = priv;
 	rx->q_num = idx;
-	rx->packet_buffer_size = GVE_DEFAULT_RX_BUFFER_SIZE;
+	rx->packet_buffer_size = cfg->packet_buffer_size;
 
 	rx->mask = slots - 1;
 	rx->data.raw_addressing = cfg->raw_addressing;

drivers/net/ethernet/google/gve/gve_rx_dqo.c

@@ -223,6 +223,7 @@ int gve_rx_alloc_ring_dqo(struct gve_priv *priv,
 	memset(rx, 0, sizeof(*rx));
 	rx->gve = priv;
 	rx->q_num = idx;
+	rx->packet_buffer_size = cfg->packet_buffer_size;
 
 	rx->dqo.num_buf_states = cfg->raw_addressing ? buffer_queue_slots :
 		gve_get_rx_pages_per_qpl_dqo(cfg->ring_size);