git: f4592cd2a4b0 - stable/13 - cxgbe(4): Keep link configuration compatible with really old firmwares.

The branch stable/13 has been updated by np:

URL: https://cgit.FreeBSD.org/src/commit/?id=f4592cd2a4b040cdc279bc53d0a5905c350e7090

commit f4592cd2a4b040cdc279bc53d0a5905c350e7090
Author:     Navdeep Parhar <np@FreeBSD.org>
AuthorDate: 2021-11-11 00:10:41 +0000
Commit:     Navdeep Parhar <np@FreeBSD.org>
CommitDate: 2022-02-28 06:45:20 +0000

    cxgbe(4): Keep link configuration compatible with really old firmwares.
    
    Sponsored by:   Chelsio Communications
    
    (cherry picked from commit 8e76bae0b72e53da80c48ba138b1cfd712724df4)
---
 sys/dev/cxgbe/common/t4_hw.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/sys/dev/cxgbe/common/t4_hw.c b/sys/dev/cxgbe/common/t4_hw.c
index d6f85a1fcd34..e2b55dc71eba 100644
--- a/sys/dev/cxgbe/common/t4_hw.c
+++ b/sys/dev/cxgbe/common/t4_hw.c
@@ -3959,6 +3959,14 @@ int t4_link_l1cfg(struct adapter *adap, unsigned int mbox, unsigned int port,
 			if (lc->requested_fec & FEC_MODULE)
 				fec |= fec_to_fwcap(lc->fec_hint);
 		}
+
+		/*
+		 * This is for compatibility with old firmwares. The original
+		 * way to request NO_FEC was to not set any of the FEC bits. New
+		 * firmwares understand this too.
+		 */
+		if (fec == FW_PORT_CAP32_FEC_NO_FEC)
+			fec = 0;
 	}
 
 	/* Force AN on for BT cards. */