svn commit: r359653 - head/sys/dev/mlx5/mlx5_en

[Hans Petter Selasky]

Author: hselasky
Date: Mon Apr  6 09:41:22 2020
New Revision: 359653
URL: https://svnweb.freebsd.org/changeset/base/359653

Log:
  Count number of times transmit ring is out of buffers in mlx5en(4).
  
  Differential Revision:	https://reviews.freebsd.org/D24273
  MFC after:	1 week
  Sponsored by:	Mellanox Technologies

Modified:
  head/sys/dev/mlx5/mlx5_en/en.h
  head/sys/dev/mlx5/mlx5_en/mlx5_en_tx.c

Modified: head/sys/dev/mlx5/mlx5_en/en.h
==============================================================================
--- head/sys/dev/mlx5/mlx5_en/en.h	Mon Apr  6 07:16:31 2020	(r359652)
+++ head/sys/dev/mlx5/mlx5_en/en.h	Mon Apr  6 09:41:22 2020	(r359653)
@@ -627,6 +627,7 @@ struct mlx5e_rq_stats {
   m(+1, u64, csum_offload_none, "csum_offload_none", "Transmitted packets")	\
   m(+1, u64, defragged, "defragged", "Transmitted packets")		\
   m(+1, u64, dropped, "dropped", "Transmitted packets")			\
+  m(+1, u64, enobuf, "enobuf", "Transmitted packets")			\
   m(+1, u64, nop, "nop", "Transmitted packets")
 
 #define	MLX5E_SQ_STATS_NUM (0 MLX5E_SQ_STATS(MLX5E_STATS_COUNT))

Modified: head/sys/dev/mlx5/mlx5_en/mlx5_en_tx.c
==============================================================================
--- head/sys/dev/mlx5/mlx5_en/mlx5_en_tx.c	Mon Apr  6 07:16:31 2020	(r359652)
+++ head/sys/dev/mlx5/mlx5_en/mlx5_en_tx.c	Mon Apr  6 09:41:22 2020	(r359653)
@@ -401,6 +401,7 @@ mlx5e_sq_dump_xmit(struct mlx5e_sq *sq, struct mlx5e_x
 
 	/* return ENOBUFS if the queue is full */
 	if (unlikely(!mlx5e_sq_has_room_for(sq, xsegs))) {
+		sq->stats.enobuf++;
 		bus_dmamap_unload(sq->dma_tag, sq->mbuf[pi].dma_map);
 		m_freem(mb);
 		*mbp = NULL;	/* safety clear */
@@ -493,8 +494,10 @@ mlx5e_sq_xmit(struct mlx5e_sq *sq, struct mbuf **mbp)
 top:
 #endif
 	/* Return ENOBUFS if the queue is full */
-	if (unlikely(!mlx5e_sq_has_room_for(sq, 2 * MLX5_SEND_WQE_MAX_WQEBBS)))
+	if (unlikely(!mlx5e_sq_has_room_for(sq, 2 * MLX5_SEND_WQE_MAX_WQEBBS))) {
+		sq->stats.enobuf++;
 		return (ENOBUFS);
+	}
 
 	/* Align SQ edge with NOPs to avoid WQE wrap around */
 	pi = ((~sq->pc) & sq->wq.sz_m1);
@@ -502,8 +505,10 @@ top:
 		/* Send one multi NOP message instead of many */
 		mlx5e_send_nop(sq, (pi + 1) * MLX5_SEND_WQEBB_NUM_DS);
 		pi = ((~sq->pc) & sq->wq.sz_m1);
-		if (pi < (MLX5_SEND_WQE_MAX_WQEBBS - 1))
+		if (pi < (MLX5_SEND_WQE_MAX_WQEBBS - 1)) {
+			sq->stats.enobuf++;
 			return (ENOMEM);
+		}
 	}
 
 #ifdef KERN_TLS