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18de1e517e
It is suboptimal to attempt skb linearization from ndo_start_xmit() if a gso skb has pathological layout, or if host stack does not have access to the payload (TCP direct). Linearization of large skbs can also fail under memory pressure. We should instead have an ndo_features_check() so that we can fallback to GSO, which is supported even for TCP direct, and generally much more efficient (no payload copy). Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Bailey Forrest <bcf@google.com> Cc: Willem de Bruijn <willemb@google.com> Cc: Jeroen de Borst <jeroendb@google.com> Cc: Praveen Kaligineedi <pkaligineedi@google.com> Cc: Shailend Chand <shailend@google.com> Cc: Ziwei Xiao <ziweixiao@google.com> Reviewed-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
97 lines
2.9 KiB
C
97 lines
2.9 KiB
C
/* SPDX-License-Identifier: (GPL-2.0 OR MIT)
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* Google virtual Ethernet (gve) driver
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*
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* Copyright (C) 2015-2021 Google, Inc.
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*/
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#ifndef _GVE_DQO_H_
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#define _GVE_DQO_H_
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#include "gve_adminq.h"
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#define GVE_ITR_ENABLE_BIT_DQO BIT(0)
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#define GVE_ITR_CLEAR_PBA_BIT_DQO BIT(1)
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#define GVE_ITR_NO_UPDATE_DQO (3 << 3)
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#define GVE_ITR_INTERVAL_DQO_SHIFT 5
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#define GVE_ITR_INTERVAL_DQO_MASK ((1 << 12) - 1)
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#define GVE_TX_IRQ_RATELIMIT_US_DQO 50
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#define GVE_RX_IRQ_RATELIMIT_US_DQO 20
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#define GVE_MAX_ITR_INTERVAL_DQO (GVE_ITR_INTERVAL_DQO_MASK * 2)
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/* Timeout in seconds to wait for a reinjection completion after receiving
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* its corresponding miss completion.
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*/
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#define GVE_REINJECT_COMPL_TIMEOUT 1
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/* Timeout in seconds to deallocate the completion tag for a packet that was
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* prematurely freed for not receiving a valid completion. This should be large
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* enough to rule out the possibility of receiving the corresponding valid
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* completion after this interval.
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*/
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#define GVE_DEALLOCATE_COMPL_TIMEOUT 60
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netdev_tx_t gve_tx_dqo(struct sk_buff *skb, struct net_device *dev);
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netdev_features_t gve_features_check_dqo(struct sk_buff *skb,
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struct net_device *dev,
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netdev_features_t features);
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bool gve_tx_poll_dqo(struct gve_notify_block *block, bool do_clean);
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int gve_rx_poll_dqo(struct gve_notify_block *block, int budget);
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int gve_tx_alloc_rings_dqo(struct gve_priv *priv);
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void gve_tx_free_rings_dqo(struct gve_priv *priv);
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int gve_rx_alloc_rings_dqo(struct gve_priv *priv);
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void gve_rx_free_rings_dqo(struct gve_priv *priv);
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int gve_clean_tx_done_dqo(struct gve_priv *priv, struct gve_tx_ring *tx,
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struct napi_struct *napi);
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void gve_rx_post_buffers_dqo(struct gve_rx_ring *rx);
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void gve_rx_write_doorbell_dqo(const struct gve_priv *priv, int queue_idx);
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static inline void
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gve_tx_put_doorbell_dqo(const struct gve_priv *priv,
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const struct gve_queue_resources *q_resources, u32 val)
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{
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u64 index;
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index = be32_to_cpu(q_resources->db_index);
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iowrite32(val, &priv->db_bar2[index]);
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}
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/* Builds register value to write to DQO IRQ doorbell to enable with specified
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* ITR interval.
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*/
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static inline u32 gve_setup_itr_interval_dqo(u32 interval_us)
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{
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u32 result = GVE_ITR_ENABLE_BIT_DQO;
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/* Interval has 2us granularity. */
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interval_us >>= 1;
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interval_us &= GVE_ITR_INTERVAL_DQO_MASK;
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result |= (interval_us << GVE_ITR_INTERVAL_DQO_SHIFT);
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return result;
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}
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static inline void
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gve_write_irq_doorbell_dqo(const struct gve_priv *priv,
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const struct gve_notify_block *block, u32 val)
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{
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u32 index = be32_to_cpu(*block->irq_db_index);
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iowrite32(val, &priv->db_bar2[index]);
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}
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/* Sets interrupt throttling interval and enables interrupt
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* by writing to IRQ doorbell.
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*/
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static inline void
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gve_set_itr_coalesce_usecs_dqo(struct gve_priv *priv,
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struct gve_notify_block *block,
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u32 usecs)
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{
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gve_write_irq_doorbell_dqo(priv, block,
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gve_setup_itr_interval_dqo(usecs));
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}
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#endif /* _GVE_DQO_H_ */
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