Shorten list of arguments to mbuf external storage freeing function.

All of these arguments are stored in m_ext, so there is no reason
to pass them in the argument list.  Not all functions need the second
argument, some don't even need the first one.  The second argument
lives in next cache line, so not dereferencing it is a performance
gain.  This was discovered in sendfile(2), which will be covered by
next commits.

The second goal of this commit is to bring even more flexibility
to m_ext mbufs, allowing to create more fields in m_ext, opaque to
the generic mbuf code, and potentially set and dereferenced by
subsystems.

Reviewed by:	gallatin, kbowling
Differential Revision:	https://reviews.freebsd.org/D12615

1 files changed, 5 insertions, 5 deletions

diff --git a/sys/dev/mwl/if_mwl.c b/sys/dev/mwl/if_mwl.c
index 79172aaf7bd7..861cbff950f3 100644
--- a/sys/dev/mwl/if_mwl.c
+++ b/sys/dev/mwl/if_mwl.c
@@ -2522,12 +2522,12 @@ mwl_rxbuf_init(struct mwl_softc *sc, struct mwl_rxbuf *bf)
 }
 
 static void
-mwl_ext_free(struct mbuf *m, void *data, void *arg)
+mwl_ext_free(struct mbuf *m)
 {
-	struct mwl_softc *sc = arg;
+	struct mwl_softc *sc = m->m_ext.ext_arg1;
 
 	/* XXX bounds check data */
-	mwl_putrxdma(sc, data);
+	mwl_putrxdma(sc, m->m_ext.ext_buf);
 	/*
 	 * If we were previously blocked by a lack of rx dma buffers
 	 * check if we now have enough to restart rx interrupt handling.
@@ -2746,8 +2746,8 @@ mwl_rx_proc(void *arg, int npending)
 		 * descriptor using the replacement dma
 		 * buffer we just installed above.
 		 */
-		MEXTADD(m, data, MWL_AGGR_SIZE, mwl_ext_free,
-		    data, sc, 0, EXT_NET_DRV);
+		m_extadd(m, data, MWL_AGGR_SIZE, mwl_ext_free, sc, NULL, 0,
+		    EXT_NET_DRV);
 		m->m_data += off - hdrlen;
 		m->m_pkthdr.len = m->m_len = pktlen;
 		/* NB: dma buffer assumed read-only */