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The TCP Segmentation Offload (TSO) engine is an optional function in DWMAC cores, it is implemented for dwmac4 and dwxgmac2 only, ancient dwmac100 and dwmac1000 are not supported by hardware. Current driver code checks priv->dma_cap.tsoen which is read from MAC_HW_Feature1 register to determine if TSO is enabled in hardware configurations, if (!priv->dma_cap.tsoen) driver never sets NETIF_F_TSO for net_device. This patch never affects dwmac100/dwmac1000 and their stmmac_desc_ops: ndesc_ops/enh_desc_ops, since TSO is never supported by them two. The DMA AXI address width of DWMAC cores can be configured to 32-bit/40-bit/48-bit, then the format of DMA transmit descriptors get a little different between 32-bit and 40-bit/48-bit. Current driver code checks priv->dma_cap.addr64 to use certain format with certain configuration. This patch converts the format of DMA transmit descriptors on dwmac4 and dwxgmac2 that the DMA AXI address width is configured to 32-bit (as described by function comments of stmmac_tso_xmit() in current code) to a more generic format (see updated function comments after this patch) which is actually already used on 40-bit/48-bit platforms to provide better compatibility and make code flow cleaner in TSO TX routine. Another interesting finding, struct stmmac_desc_ops is a common abstract interface to maintain descriptors, we should avoid the direct assignment of descriptor members (e.g. desc->des0), stmmac_set_desc_addr() is the proper method yet. This patch tries to improve this by the way. Tested and verified on: DWMAC CORE 5.00a with 32-bit DMA AXI address width DWMAC CORE 5.10a with 32-bit DMA AXI address width DWXGMAC CORE 3.20a with 40-bit DMA AXI address width Signed-off-by: Furong Xu <0x1207@gmail.com> Link: https://patch.msgid.link/20241220080726.1733837-1-0x1207@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org> |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.