diff mbox series

[net-next,4/4] net: xilinx: axienet: Support IFF_ALLMULTI

Message ID 20240812200437.3581990-5-sean.anderson@linux.dev (mailing list archive)
State Superseded
Delegated to: Netdev Maintainers
Headers show
Series net: xilinx: axienet: Multicast fixes and improvements | expand

Checks

Context Check Description
netdev/series_format success Posting correctly formatted
netdev/tree_selection success Clearly marked for net-next
netdev/ynl success Generated files up to date; no warnings/errors; no diff in generated;
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 29 this patch: 29
netdev/build_tools success No tools touched, skip
netdev/cc_maintainers success CCed 7 of 7 maintainers
netdev/build_clang success Errors and warnings before: 29 this patch: 29
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 31 this patch: 31
netdev/checkpatch warning WARNING: line length of 82 exceeds 80 columns
netdev/build_clang_rust success No Rust files in patch. Skipping build
netdev/kdoc success Errors and warnings before: 3 this patch: 3
netdev/source_inline success Was 0 now: 0
netdev/contest warning net-next-2024-08-14--09-00 (tests: 708)

Commit Message

Sean Anderson Aug. 12, 2024, 8:04 p.m. UTC 
Add support for IFF_ALLMULTI by configuring a single filter to match the
multicast address bit. This allows us to keep promiscuous mode disabled,
even when we have more than four multicast addresses. An even better
solution would be to "pack" addresses into the available CAM registers,
but that can wait for a future series.

Signed-off-by: Sean Anderson <sean.anderson@linux.dev>
---

 drivers/net/ethernet/xilinx/xilinx_axienet.h  |  2 ++
 .../net/ethernet/xilinx/xilinx_axienet_main.c | 34 +++++++++++--------
 2 files changed, 22 insertions(+), 14 deletions(-)

Comments

Simon Horman Aug. 15, 2024, 3:02 p.m. UTC | #1 
On Mon, Aug 12, 2024 at 04:04:37PM -0400, Sean Anderson wrote:
> Add support for IFF_ALLMULTI by configuring a single filter to match the
> multicast address bit. This allows us to keep promiscuous mode disabled,
> even when we have more than four multicast addresses. An even better
> solution would be to "pack" addresses into the available CAM registers,
> but that can wait for a future series.
> 
> Signed-off-by: Sean Anderson <sean.anderson@linux.dev>

My comment on patch 1/4 notwithstanding, this looks good to me.

Reviewed-by: Simon Horman <horms@kernel.org>
diff mbox series

Patch

diff --git a/drivers/net/ethernet/xilinx/xilinx_axienet.h b/drivers/net/ethernet/xilinx/xilinx_axienet.h
index 03fef656478e..d1b68a040f5a 100644
--- a/drivers/net/ethernet/xilinx/xilinx_axienet.h
+++ b/drivers/net/ethernet/xilinx/xilinx_axienet.h
@@ -173,6 +173,8 @@ 
 #define XAE_FFE_OFFSET		0x0000070C /* Frame Filter Enable */
 #define XAE_AF0_OFFSET		0x00000710 /* Address Filter 0 */
 #define XAE_AF1_OFFSET		0x00000714 /* Address Filter 1 */
+#define XAE_AM0_OFFSET		0x00000750 /* Frame Filter Mask Value Bytes 3-0 */
+#define XAE_AM1_OFFSET		0x00000754 /* Frame Filter Mask Value Bytes 7-4 */
 
 #define XAE_TX_VLAN_DATA_OFFSET 0x00004000 /* TX VLAN data table address */
 #define XAE_RX_VLAN_DATA_OFFSET 0x00008000 /* RX VLAN data table address */
diff --git a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
index 9bcad515f156..c420bc753750 100644
--- a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
+++ b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
@@ -437,18 +437,27 @@  static void axienet_set_multicast_list(struct net_device *ndev)
 	u32 reg, af0reg, af1reg;
 	struct axienet_local *lp = netdev_priv(ndev);
 
-	if (ndev->flags & (IFF_ALLMULTI | IFF_PROMISC) ||
-	    netdev_mc_count(ndev) > XAE_MULTICAST_CAM_TABLE_NUM) {
-		reg = axienet_ior(lp, XAE_FMI_OFFSET);
+	reg = axienet_ior(lp, XAE_FMI_OFFSET);
+	reg &= ~XAE_FMI_PM_MASK;
+	if (ndev->flags & IFF_PROMISC)
 		reg |= XAE_FMI_PM_MASK;
+	else
+		reg &= ~XAE_FMI_PM_MASK;
+	axienet_iow(lp, XAE_FMI_OFFSET, reg);
+
+	if (ndev->flags & IFF_ALLMULTI ||
+	    netdev_mc_count(ndev) > XAE_MULTICAST_CAM_TABLE_NUM) {
+		reg &= 0xFFFFFF00;
 		axienet_iow(lp, XAE_FMI_OFFSET, reg);
+		axienet_iow(lp, XAE_AF0_OFFSET, 1); /* Multicast bit */
+		axienet_iow(lp, XAE_AF1_OFFSET, 0);
+		axienet_iow(lp, XAE_AM0_OFFSET, 1); /* ditto */
+		axienet_iow(lp, XAE_AM1_OFFSET, 0);
+		axienet_iow(lp, XAE_FFE_OFFSET, 1);
+		i = 1;
 	} else if (!netdev_mc_empty(ndev)) {
 		struct netdev_hw_addr *ha;
 
-		reg = axienet_ior(lp, XAE_FMI_OFFSET);
-		reg &= ~XAE_FMI_PM_MASK;
-		axienet_iow(lp, XAE_FMI_OFFSET, reg);
-
 		netdev_for_each_mc_addr(ha, ndev) {
 			if (i >= XAE_MULTICAST_CAM_TABLE_NUM)
 				break;
@@ -461,24 +470,21 @@  static void axienet_set_multicast_list(struct net_device *ndev)
 			af1reg = (ha->addr[4]);
 			af1reg |= (ha->addr[5] << 8);
 
-			reg = axienet_ior(lp, XAE_FMI_OFFSET) & 0xFFFFFF00;
+			reg &= 0xFFFFFF00;
 			reg |= i;
 
 			axienet_iow(lp, XAE_FMI_OFFSET, reg);
 			axienet_iow(lp, XAE_AF0_OFFSET, af0reg);
 			axienet_iow(lp, XAE_AF1_OFFSET, af1reg);
+			axienet_iow(lp, XAE_AM0_OFFSET, 0xffffffff);
+			axienet_iow(lp, XAE_AM1_OFFSET, 0x0000ffff);
 			axienet_iow(lp, XAE_FFE_OFFSET, 1);
 			i++;
 		}
-	} else {
-		reg = axienet_ior(lp, XAE_FMI_OFFSET);
-		reg &= ~XAE_FMI_PM_MASK;
-
-		axienet_iow(lp, XAE_FMI_OFFSET, reg);
 	}
 
 	for (; i < XAE_MULTICAST_CAM_TABLE_NUM; i++) {
-		reg = axienet_ior(lp, XAE_FMI_OFFSET) & 0xFFFFFF00;
+		reg &= 0xFFFFFF00;
 		reg |= i;
 		axienet_iow(lp, XAE_FMI_OFFSET, reg);
 		axienet_iow(lp, XAE_FFE_OFFSET, 0);