Re: [PATCH net-next v24 11/13] net: add devmem TCP documentation

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Sat, 31 Aug 2024 00:43:11 +0000 Mina Almasry wrote:
> +The socket must be flow steered to the dmabuf bound RX queue::
> +
> +	ethtool -N eth1 flow-type tcp4 ... queue 15,

nit: tailing comma here

> +Devmem payloads are inaccessible to the kernel processing the packets. This
> +results in a few quirks for payloads of devmem skbs:
> +
> +- Loopback is not functional. Loopback relies on copying the payload, which is
> +  not possible with devmem skbs.
> +
> +- Software checksum calculation fails.

Speaking of which, I think we need to add readability check to 
skb_checksum_help(). Shouldn't the check in __skb_checksum() 
have a WARN_ON_ONCE() around it? It's impossible to return 
an error from there.

> +- TCP Dump and bpf can't access devmem packet payloads.
> +
> +
> +Testing
> +=======
> +
> +More realistic example code can be found in the kernel source under
> +tools/testing/selftests/net/ncdevmem.c

looks like HTML output wraps the file path, maybe quote it as
``tools/testing/selftests/net/ncdevmem.c`` ?




[Index of Archives]     [Linux Wireless]     [Linux Kernel]     [ATH6KL]     [Linux Bluetooth]     [Linux Netdev]     [Kernel Newbies]     [Share Photos]     [IDE]     [Security]     [Git]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Linux ATA RAID]     [Samba]     [Device Mapper]

  Powered by Linux