git: c9ea1e9994b5 - stable/15 - cxgbe: Use the correct GHASH offset for a GMAC from a full TLS record

The branch stable/15 has been updated by jhb:

URL: https://cgit.FreeBSD.org/src/commit/?id=c9ea1e9994b511b7d820a5986442af9224322833

commit c9ea1e9994b511b7d820a5986442af9224322833
Author:     John Baldwin <jhb@FreeBSD.org>
AuthorDate: 2026-09-16 19:56:20 +0000
Commit:     John Baldwin <jhb@FreeBSD.org>
CommitDate: 2026-10-08 20:42:33 +0000

    cxgbe: Use the correct GHASH offset for a GMAC from a full TLS record
    
    If a TLS request transmits all but a part of the GMAC at the end of a
    TLS record, the work request asks the crypto engine to return the
    calculated GMAC to the driver so it can be sent in a simple TCP packet
    when the rest of the TLS record is transmitted in the future.
    However, the offset of the returned GHASH offset was calculated
    incorrectly in this case causing the driver to not recognize the
    cached GMAC and instead use a more wasteful work request in the future
    that encrypted the entire TLS record discarding all but the needed
    bytes of the trailer.
    
    Note that this does not effect correctness, just efficiency.
    
    Reviewed by:    np
    Fixes:          9e269eafebfc ("cxgbe: Use partial GCM mode for partial TLS records on T7")
    Sponsored by:   Chelsio Communications
    Differential Revision:  https://reviews.freebsd.org/D59711
    (cherry picked from commit ed5fc8066f98e639f624de9997b33727ed883c32)
---
 sys/dev/cxgbe/crypto/t7_kern_tls.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sys/dev/cxgbe/crypto/t7_kern_tls.c b/sys/dev/cxgbe/crypto/t7_kern_tls.c
index e287f7f714be..584161f37a07 100644
--- a/sys/dev/cxgbe/crypto/t7_kern_tls.c
+++ b/sys/dev/cxgbe/crypto/t7_kern_tls.c
@@ -1978,7 +1978,7 @@ ktls_write_tls_wr(struct tlspcb *tlsp, struct sge_txq *txq,
 		tlsp->ghash_pending = true;
 		tlsp->ghash_valid = false;
 		tlsp->ghash_lcb = ghash_lcb;
-		if (last_ghash_frag)
+		if (ghash_lcb)
 			tlsp->ghash_offset = offset + plen;
 		else
 			tlsp->ghash_offset = rounddown2(offset + plen,