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Subject[PATCH v2 3/7] net: thunderx: add multicast filter management support
Date
From: Vadim Lomovtsev <Vadim.Lomovtsev@cavium.com>

The ThunderX NIC could be partitioned to up to 128 VFs and thus
represented to system. Each VF is mapped to pair BGX:LMAC, and each of VF
is configured by kernel individually. Eventually the bunch of VFs could be
mapped onto same pair BGX:LMAC and thus could cause several multicast
filtering configuration requests to LMAC with the same MAC addresses.

This commit is to add ThunderX NIC BGX filtering manipulation routines.

Signed-off-by: Vadim Lomovtsev <Vadim.Lomovtsev@cavium.com>
---
drivers/net/ethernet/cavium/thunder/thunder_bgx.c | 144 ++++++++++++++++++++++
drivers/net/ethernet/cavium/thunder/thunder_bgx.h | 10 +-
2 files changed, 153 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/cavium/thunder/thunder_bgx.c b/drivers/net/ethernet/cavium/thunder/thunder_bgx.c
index de90e6aa5a4f..5d08d2aeb172 100644
--- a/drivers/net/ethernet/cavium/thunder/thunder_bgx.c
+++ b/drivers/net/ethernet/cavium/thunder/thunder_bgx.c
@@ -258,6 +258,150 @@ static void bgx_flush_dmac_cam_filter(struct bgx *bgx, int lmacid)
sizeof(u64), 0);
}

+static void bgx_lmac_remove_filters(struct lmac *lmac, u8 vf_id)
+{
+ int i = 0;
+
+ if (!lmac)
+ return;
+
+ /* We've got reset filters request from some of attached VF, while the
+ * others might want to keep their configuration. So in this case lets
+ * iterate over all of configured filters and decrease number of
+ * referencies. if some addresses get zero refs remove them from list
+ */
+ for (i = lmac->dmacs_cfg - 1; i >= 0; i--) {
+ lmac->dmacs[i].vf_map &= ~BIT_ULL(vf_id);
+ if (!lmac->dmacs[i].vf_map) {
+ lmac->dmacs_cfg--;
+ lmac->dmacs[i].dmac = 0;
+ lmac->dmacs[i].vf_map = 0;
+ }
+ }
+}
+
+static int bgx_lmac_save_filter(struct lmac *lmac, u64 dmac, u8 vf_id)
+{
+ u8 i = 0;
+
+ if (!lmac)
+ return -1;
+
+ /* At the same time we could have several VFs 'attached' to some
+ * particular LMAC, and each VF is represented as network interface
+ * for kernel. So from user perspective it should be possible to
+ * manipulate with its' (VF) receive modes. However from PF
+ * driver perspective we need to keep track of filter configurations
+ * for different VFs to prevent filter values dupes
+ */
+ for (i = 0; i < lmac->dmacs_cfg; i++) {
+ if (lmac->dmacs[i].dmac == dmac) {
+ lmac->dmacs[i].vf_map |= BIT_ULL(vf_id);
+ return -1;
+ }
+ }
+
+ if (!(lmac->dmacs_cfg < lmac->dmacs_count))
+ return -1;
+
+ /* keep it for further tracking */
+ lmac->dmacs[lmac->dmacs_cfg].dmac = dmac;
+ lmac->dmacs[lmac->dmacs_cfg].vf_map = BIT_ULL(vf_id);
+ lmac->dmacs_cfg++;
+ return 0;
+}
+
+static int bgx_set_dmac_cam_filter_mac(struct bgx *bgx, int lmacid,
+ u64 cam_dmac, u8 idx)
+{
+ struct lmac *lmac = NULL;
+ u64 cfg = 0;
+
+ /* skip zero addresses as meaningless */
+ if (!cam_dmac || !bgx)
+ return -1;
+
+ lmac = &bgx->lmac[lmacid];
+
+ /* configure DCAM filtering for designated LMAC */
+ cfg = RX_DMACX_CAM_LMACID(lmacid & LMAC_ID_MASK) |
+ RX_DMACX_CAM_EN | cam_dmac;
+ bgx_reg_write(bgx, 0, BGX_CMR_RX_DMACX_CAM +
+ ((lmacid * lmac->dmacs_count) + idx) * sizeof(u64), cfg);
+ return 0;
+}
+
+void bgx_set_dmac_cam_filter(int node, int bgx_idx, int lmacid,
+ u64 cam_dmac, u8 vf_id)
+{
+ struct bgx *bgx = get_bgx(node, bgx_idx);
+ struct lmac *lmac = NULL;
+
+ if (!bgx)
+ return;
+
+ lmac = &bgx->lmac[lmacid];
+
+ if (!cam_dmac)
+ cam_dmac = ether_addr_to_u64(lmac->mac);
+
+ /* since we might have several VFs attached to particular LMAC
+ * and kernel could call mcast config for each of them with the
+ * same MAC, check if requested MAC is already in filtering list and
+ * updare/prepare list of MACs to be applied later to HW filters
+ */
+ bgx_lmac_save_filter(lmac, cam_dmac, vf_id);
+}
+EXPORT_SYMBOL(bgx_set_dmac_cam_filter);
+
+void bgx_set_xcast_mode(int node, int bgx_idx, int lmacid, u8 mode)
+{
+ struct bgx *bgx = get_bgx(node, bgx_idx);
+ struct lmac *lmac = NULL;
+ u64 cfg = 0;
+ u8 i = 0;
+
+ if (!bgx)
+ return;
+
+ lmac = &bgx->lmac[lmacid];
+
+ cfg = bgx_reg_read(bgx, lmacid, BGX_CMRX_RX_DMAC_CTL);
+ if (mode & BGX_XCAST_BCAST_ACCEPT)
+ cfg |= BCAST_ACCEPT;
+ else
+ cfg &= ~BCAST_ACCEPT;
+
+ /* disable all MCASTs and DMAC filtering */
+ cfg &= ~(CAM_ACCEPT | BGX_MCAST_MODE(MCAST_MODE_MASK));
+
+ /* check requested bits and set filtergin mode appropriately */
+ if (mode & (BGX_XCAST_MCAST_ACCEPT)) {
+ cfg |= (BGX_MCAST_MODE(MCAST_MODE_ACCEPT));
+ } else if (mode & BGX_XCAST_MCAST_FILTER) {
+ cfg |= (BGX_MCAST_MODE(MCAST_MODE_CAM_FILTER) | CAM_ACCEPT);
+ for (i = 0; i < lmac->dmacs_cfg; i++)
+ bgx_set_dmac_cam_filter_mac(bgx, lmacid,
+ lmac->dmacs[i].dmac, i);
+ }
+ bgx_reg_write(bgx, lmacid, BGX_CMRX_RX_DMAC_CTL, cfg);
+}
+EXPORT_SYMBOL(bgx_set_xcast_mode);
+
+void bgx_reset_xcast_mode(int node, int bgx_idx, int lmacid, u8 vf_id)
+{
+ struct bgx *bgx = get_bgx(node, bgx_idx);
+
+ if (!bgx)
+ return;
+
+ bgx_lmac_remove_filters(&bgx->lmac[lmacid], vf_id);
+ bgx_flush_dmac_cam_filter(bgx, lmacid);
+ bgx_set_xcast_mode(node, bgx_idx, lmacid,
+ (BGX_XCAST_BCAST_ACCEPT | BGX_XCAST_MCAST_ACCEPT));
+}
+EXPORT_SYMBOL(bgx_reset_xcast_mode);
+
void bgx_lmac_rx_tx_enable(int node, int bgx_idx, int lmacid, bool enable)
{
struct bgx *bgx = get_bgx(node, bgx_idx);
diff --git a/drivers/net/ethernet/cavium/thunder/thunder_bgx.h b/drivers/net/ethernet/cavium/thunder/thunder_bgx.h
index 52439da62c97..cbdd20b9ee6f 100644
--- a/drivers/net/ethernet/cavium/thunder/thunder_bgx.h
+++ b/drivers/net/ethernet/cavium/thunder/thunder_bgx.h
@@ -30,6 +30,7 @@
#define DEFAULT_PAUSE_TIME 0xFFFF

#define BGX_ID_MASK 0x3
+#define LMAC_ID_MASK 0x3

#define MAX_DMAC_PER_LMAC_TNS_BYPASS_MODE 2

@@ -57,7 +58,7 @@
#define BGX_CMRX_RX_FIFO_LEN 0x108
#define BGX_CMR_RX_DMACX_CAM 0x200
#define RX_DMACX_CAM_EN BIT_ULL(48)
-#define RX_DMACX_CAM_LMACID(x) (x << 49)
+#define RX_DMACX_CAM_LMACID(x) (((u64)x) << 49)
#define RX_DMAC_COUNT 32
#define BGX_CMR_RX_STREERING 0x300
#define RX_TRAFFIC_STEER_RULE_COUNT 8
@@ -205,6 +206,13 @@
#define LMAC_INTR_LINK_UP BIT(0)
#define LMAC_INTR_LINK_DOWN BIT(1)

+#define BGX_XCAST_BCAST_ACCEPT BIT(0)
+#define BGX_XCAST_MCAST_ACCEPT BIT(1)
+#define BGX_XCAST_MCAST_FILTER BIT(2)
+
+void bgx_set_dmac_cam_filter(int node, int bgx_idx, int lmacid, u64 mac, u8 vf);
+void bgx_reset_xcast_mode(int node, int bgx_idx, int lmacid, u8 vf);
+void bgx_set_xcast_mode(int node, int bgx_idx, int lmacid, u8 mode);
void octeon_mdiobus_force_mod_depencency(void);
void bgx_lmac_rx_tx_enable(int node, int bgx_idx, int lmacid, bool enable);
void bgx_add_dmac_addr(u64 dmac, int node, int bgx_idx, int lmac);
--
2.14.3
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