From 5c2c85315948c42c6c0258cf9bad596acaa79043 Mon Sep 17 00:00:00 2001 From: Richard Laing Date: Thu, 15 Jul 2021 09:18:05 +1200 Subject: [PATCH] bus: mhi: pci-generic: configurable network interface MRU The MRU value used by the MHI MBIM network interface affects the throughput performance of the interface. Different modem models use different default MRU sizes based on their bandwidth capabilities. Large values generally result in higher throughput for larger packet sizes. In addition if the MRU used by the MHI device is larger than that specified in the MHI net device the data is fragmented and needs to be re-assembled which generates a (single) warning message about the fragmented packets. Setting the MRU on both ends avoids the extra processing to re-assemble the packets. This patch allows the documented MRU for a modem to be automatically set as the MHI net device MRU avoiding fragmentation and improving throughput performance. Signed-off-by: Richard Laing Signed-off-by: David S. Miller --- drivers/bus/mhi/pci_generic.c | 6 +++++- drivers/net/mhi/net.c | 1 + drivers/net/mhi/proto_mbim.c | 4 +++- include/linux/mhi.h | 2 ++ 4 files changed, 11 insertions(+), 2 deletions(-) diff --git a/drivers/bus/mhi/pci_generic.c b/drivers/bus/mhi/pci_generic.c index ca3bc40427f8..19413daa0917 100644 --- a/drivers/bus/mhi/pci_generic.c +++ b/drivers/bus/mhi/pci_generic.c @@ -32,6 +32,7 @@ * @edl: emergency download mode firmware path (if any) * @bar_num: PCI base address register to use for MHI MMIO register space * @dma_data_width: DMA transfer word size (32 or 64 bits) + * @mru_default: default MRU size for MBIM network packets */ struct mhi_pci_dev_info { const struct mhi_controller_config *config; @@ -40,6 +41,7 @@ struct mhi_pci_dev_info { const char *edl; unsigned int bar_num; unsigned int dma_data_width; + unsigned int mru_default; }; #define MHI_CHANNEL_CONFIG_UL(ch_num, ch_name, el_count, ev_ring) \ @@ -251,7 +253,8 @@ static const struct mhi_pci_dev_info mhi_qcom_sdx55_info = { .edl = "qcom/sdx55m/edl.mbn", .config = &modem_qcom_v1_mhiv_config, .bar_num = MHI_PCI_DEFAULT_BAR_NUM, - .dma_data_width = 32 + .dma_data_width = 32, + .mru_default = 32768 }; static const struct mhi_pci_dev_info mhi_qcom_sdx24_info = { @@ -643,6 +646,7 @@ static int mhi_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) mhi_cntrl->wake_get = mhi_pci_wake_get_nop; mhi_cntrl->wake_put = mhi_pci_wake_put_nop; mhi_cntrl->wake_toggle = mhi_pci_wake_toggle_nop; + mhi_cntrl->mru = info->mru_default; err = mhi_pci_claim(mhi_cntrl, info->bar_num, DMA_BIT_MASK(info->dma_data_width)); if (err) diff --git a/drivers/net/mhi/net.c b/drivers/net/mhi/net.c index e60e38c1f09d..a5a2aa19bb91 100644 --- a/drivers/net/mhi/net.c +++ b/drivers/net/mhi/net.c @@ -329,6 +329,7 @@ static int mhi_net_newlink(void *ctxt, struct net_device *ndev, u32 if_id, mhi_netdev->mdev = mhi_dev; mhi_netdev->skbagg_head = NULL; mhi_netdev->proto = info->proto; + mhi_netdev->mru = mhi_dev->mhi_cntrl->mru; INIT_DELAYED_WORK(&mhi_netdev->rx_refill, mhi_net_rx_refill_work); u64_stats_init(&mhi_netdev->stats.rx_syncp); diff --git a/drivers/net/mhi/proto_mbim.c b/drivers/net/mhi/proto_mbim.c index bf1ad863237d..f1cc7f35bb85 100644 --- a/drivers/net/mhi/proto_mbim.c +++ b/drivers/net/mhi/proto_mbim.c @@ -292,7 +292,9 @@ static int mbim_init(struct mhi_net_dev *mhi_netdev) ndev->needed_headroom = sizeof(struct mbim_tx_hdr); ndev->mtu = MHI_MBIM_DEFAULT_MTU; - mhi_netdev->mru = MHI_MBIM_DEFAULT_MRU; + + if (!mhi_netdev->mru) + mhi_netdev->mru = MHI_MBIM_DEFAULT_MRU; return 0; } diff --git a/include/linux/mhi.h b/include/linux/mhi.h index 944aa3aa3035..beb918328eef 100644 --- a/include/linux/mhi.h +++ b/include/linux/mhi.h @@ -356,6 +356,7 @@ struct mhi_controller_config { * @fbc_download: MHI host needs to do complete image transfer (optional) * @wake_set: Device wakeup set flag * @irq_flags: irq flags passed to request_irq (optional) + * @mru: the default MRU for the MHI device * * Fields marked as (required) need to be populated by the controller driver * before calling mhi_register_controller(). For the fields marked as (optional) @@ -448,6 +449,7 @@ struct mhi_controller { bool fbc_download; bool wake_set; unsigned long irq_flags; + u32 mru; }; /**