git: 35c9edab4169 - main - if_dwc: enable RX checksum offload feature

The branch main has been updated by mhorne:

URL: https://cgit.FreeBSD.org/src/commit/?id=35c9edab4169f99de7e8fcada6d9b499c8405f87

commit 35c9edab4169f99de7e8fcada6d9b499c8405f87
Author:     Jiahao Li <jiahali@blackberry.com>
AuthorDate: 2022-06-21 13:23:43 +0000
Commit:     Mitchell Horne <mhorne@FreeBSD.org>
CommitDate: 2022-06-23 18:15:10 +0000

    if_dwc: enable RX checksum offload feature
    
    We claim support in ifcaps, but don't actually enable it.
    
    PR:             263886
    Reviewed by:    manu
    MFC after:      1 week
    Sponsored by:   The FreeBSD Foundation
    Differential Revision:  https://reviews.freebsd.org/D35498
---
 sys/dev/dwc/if_dwc.c | 21 +++++++++++++++++++++
 sys/dev/dwc/if_dwc.h |  1 +
 2 files changed, 22 insertions(+)

diff --git a/sys/dev/dwc/if_dwc.c b/sys/dev/dwc/if_dwc.c
index 531a83d1a41b..1685866ad9ad 100644
--- a/sys/dev/dwc/if_dwc.c
+++ b/sys/dev/dwc/if_dwc.c
@@ -518,6 +518,20 @@ dwc_enable_mac(struct dwc_softc *sc, bool enable)
 	WRITE4(sc, MAC_CONFIGURATION, reg);
 }
 
+static void
+dwc_enable_csum_offload(struct dwc_softc *sc)
+{
+	uint32_t reg;
+
+	DWC_ASSERT_LOCKED(sc);
+	reg = READ4(sc, MAC_CONFIGURATION);
+	if ((if_getcapenable(sc->ifp) & IFCAP_RXCSUM) != 0)
+		reg |= CONF_IPC;
+	else
+		reg &= ~CONF_IPC;
+	WRITE4(sc, MAC_CONFIGURATION, reg);
+}
+
 static void
 dwc_get_hwaddr(struct dwc_softc *sc, uint8_t *hwaddr)
 {
@@ -1163,6 +1177,7 @@ dwc_init_locked(struct dwc_softc *sc)
 	dwc_setup_rxfilter(sc);
 	dwc_setup_core(sc);
 	dwc_enable_mac(sc, true);
+	dwc_enable_csum_offload(sc);
 	dwc_init_dma(sc);
 
 	if_setdrvflagbits(ifp, IFF_DRV_RUNNING, IFF_DRV_OACTIVE);
@@ -1261,6 +1276,12 @@ dwc_ioctl(if_t ifp, u_long cmd, caddr_t data)
 			if_sethwassistbits(ifp, CSUM_IP | CSUM_UDP | CSUM_TCP, 0);
 		else
 			if_sethwassistbits(ifp, 0, CSUM_IP | CSUM_UDP | CSUM_TCP);
+
+		if (if_getdrvflags(ifp) & IFF_DRV_RUNNING) {
+			DWC_LOCK(sc);
+			dwc_enable_csum_offload(sc);
+			DWC_UNLOCK(sc);
+		}
 		break;
 
 	default:
diff --git a/sys/dev/dwc/if_dwc.h b/sys/dev/dwc/if_dwc.h
index d8c10258388a..09455f61cea9 100644
--- a/sys/dev/dwc/if_dwc.h
+++ b/sys/dev/dwc/if_dwc.h
@@ -48,6 +48,7 @@
 #define	 CONF_PS		(1 << 15)	/* GMII/MII */
 #define	 CONF_FES		(1 << 14)	/* MII speed select */
 #define	 CONF_DM		(1 << 11)	/* Full Duplex Enable */
+#define	 CONF_IPC		(1 << 10)	/* IPC checksum offload */
 #define	 CONF_ACS		(1 << 7)
 #define	 CONF_TE		(1 << 3)
 #define	 CONF_RE		(1 << 2)