svn commit: r355249 - stable/11/sys/dev/cxgbe/tom

[Navdeep Parhar]

Author: np
Date: Sat Nov 30 20:22:03 2019
New Revision: 355249
URL: https://svnweb.freebsd.org/changeset/base/355249

Log:
  MFC r351524:
  
  cxgbe/t4_tom: Limit work requests with immediate payload to a single
  descriptor.  The per-tid tx credits are in demand during active Tx and
  it's best not to use too many just for payload.
  
  Sponsored by:	Chelsio Communications

Modified:
  stable/11/sys/dev/cxgbe/tom/t4_cpl_io.c
Directory Properties:
  stable/11/   (props changed)

Modified: stable/11/sys/dev/cxgbe/tom/t4_cpl_io.c
==============================================================================
--- stable/11/sys/dev/cxgbe/tom/t4_cpl_io.c	Sat Nov 30 20:10:50 2019	(r355248)
+++ stable/11/sys/dev/cxgbe/tom/t4_cpl_io.c	Sat Nov 30 20:22:03 2019	(r355249)
@@ -572,7 +572,7 @@ t4_close_conn(struct adapter *sc, struct toepcb *toep)
 static inline int
 max_imm_payload(int tx_credits)
 {
-	const int n = 2;	/* Use only up to 2 desc for imm. data WR */
+	const int n = 1;	/* Use no more than one desc for imm. data WR */
 
 	KASSERT(tx_credits >= 0 &&
 		tx_credits <= MAX_OFLD_TX_CREDITS,