The attached two patches fix an issue with running BPF sockmap on TCP sockets where applications error out due to sender doing a send for each scatter gather element in the msg. The other 6.x stable and longterm kernels have this fix so we don't see it there and the issue was introduced in 6.1 by converting to the read_skb() interface. The 5.15 stable kernels use the read_sock() interface which doesn't have this issue.
We missed adding the fixes tag to the original series because the work was a code improvement and wasn't originally identified as a bugfix.
The first patch applies cleanly, the second patch does not because it touches smc, espintcp, and siw which do not apply because that code does not use sendmsg() yet on 6.1. I remove those chunks of the patch because they don't apply here.
I added a Fixes tag to the patches to point at the patch introducing the issue. Originally I sent something similar to this as a single patch where I incorrectly merged the two patches. Greg asked me to do this as two patches. Thanks.
David Howells (2): tcp_bpf: Inline do_tcp_sendpages as it's now a wrapper around tcp_sendmsg tcp_bpf, smc, tls, espintcp, siw: Reduce MSG_SENDPAGE_NOTLAST usage
net/ipv4/tcp_bpf.c | 21 +++++++++++++-------- 1 file changed, 13 insertions(+), 8 deletions(-)