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MBIM protocol makes the mhi network interface asymmetric, ingress data received from MHI is MBIM protocol, possibly containing multiple aggregated IP packets, while egress data received from network stack is IP protocol. This changes allows a 'protocol' to specify its own MRU, that when specified is used to allocate MHI RX buffers (skb). For MBIM, Set the default MTU to 1500, which is the usual network MTU for WWAN IP packets, and MRU to 3.5K (for allocation efficiency), allowing skb to fit in an usual 4K page (including padding, skb_shared_info, ...). Signed-off-by: Loic Poulain <loic.poulain@linaro.org> Signed-off-by: David S. Miller <davem@davemloft.net>
42 lines
1.0 KiB
C
42 lines
1.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/* MHI Network driver - Network over MHI bus
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*
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* Copyright (C) 2021 Linaro Ltd <loic.poulain@linaro.org>
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*/
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struct mhi_net_stats {
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u64_stats_t rx_packets;
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u64_stats_t rx_bytes;
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u64_stats_t rx_errors;
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u64_stats_t rx_dropped;
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u64_stats_t rx_length_errors;
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u64_stats_t tx_packets;
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u64_stats_t tx_bytes;
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u64_stats_t tx_errors;
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u64_stats_t tx_dropped;
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struct u64_stats_sync tx_syncp;
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struct u64_stats_sync rx_syncp;
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};
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struct mhi_net_dev {
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struct mhi_device *mdev;
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struct net_device *ndev;
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struct sk_buff *skbagg_head;
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struct sk_buff *skbagg_tail;
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const struct mhi_net_proto *proto;
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void *proto_data;
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struct delayed_work rx_refill;
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struct mhi_net_stats stats;
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u32 rx_queue_sz;
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int msg_enable;
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unsigned int mru;
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};
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struct mhi_net_proto {
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int (*init)(struct mhi_net_dev *mhi_netdev);
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struct sk_buff * (*tx_fixup)(struct mhi_net_dev *mhi_netdev, struct sk_buff *skb);
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void (*rx)(struct mhi_net_dev *mhi_netdev, struct sk_buff *skb);
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};
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extern const struct mhi_net_proto proto_mbim;
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