Re: [PATCH net v2 1/1] tcp: reject non zerocopy devmem tx

Hello:

This patch was applied to netdev/net.git (main)
by Paolo Abeni [off-list ref]:

On Fri,  4 Sep 2026 14:43:07 +0100 you wrote:

Devmem tcp tx doesn't work without zero-copy, however it's not currently
enforced if NETIF_F_SG isn't present. In this case, tcp_sendmsg_locked()
will try the copy path and try to copy data from an iovec which consists
of offsets into the dma-buf and would normally fail. Moreover,
d9c56501c72fd ("net: tcp: block mixing readable and unreadable frags")
relies on that and assumes that the devmem binding is present IFF we're
using the zero-copy path, which can be used to mix net-iov and pages in
a single skb, and break invariants. Let's reject devmem tx without
zero-copy.

[...]

Here is the summary with links:
  - [net,v2,1/1] tcp: reject non zerocopy devmem tx
    https://git.kernel.org/netdev/net/c/125755776bc6

You are awesome, thank you!
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