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mlxsw: pci: Sync Rx buffers for device

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Non-coherent architectures, like ARM, may require invalidating caches
before the device can use the DMA mapped memory, which means that before
posting pages to device, drivers should sync the memory for device.

Sync for device can be configured as page pool responsibility. Set the
relevant flag and define max_len for sync.

Cc: Jiri Pirko <jiri@resnulli.us>
Fixes: b5b60bb491 ("mlxsw: pci: Use page pool for Rx buffers allocation")
Signed-off-by: Amit Cohen <amcohen@nvidia.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Link: https://patch.msgid.link/92e01f05c4f506a4f0a9b39c10175dcc01994910.1729866134.git.petrm@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Amit Cohen 2024-10-25 16:26:27 +02:00 committed by Jakub Kicinski
parent 15f73e601a
commit d0fbdc3ae9
1 changed files with 2 additions and 1 deletions
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3
drivers/net/ethernet/mellanox/mlxsw/pci.c
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@ -996,12 +996,13 @@ static int mlxsw_pci_cq_page_pool_init(struct mlxsw_pci_queue *q,
if (cq_type != MLXSW_PCI_CQ_RDQ)
return 0;
pp_params.flags = PP_FLAG_DMA_MAP;
pp_params.flags = PP_FLAG_DMA_MAP | PP_FLAG_DMA_SYNC_DEV;
pp_params.pool_size = MLXSW_PCI_WQE_COUNT * mlxsw_pci->num_sg_entries;
pp_params.nid = dev_to_node(&mlxsw_pci->pdev->dev);
pp_params.dev = &mlxsw_pci->pdev->dev;
pp_params.napi = &q->u.cq.napi;
pp_params.dma_dir = DMA_FROM_DEVICE;
pp_params.max_len = PAGE_SIZE;
page_pool = page_pool_create(&pp_params);
if (IS_ERR(page_pool))