net: stmmac: xgmac: report L3/L4 filter match count in ethtool stats

Read the L3FM and L4FM bits from the RX descriptor status word (RDES2)
and increment the corresponding ethtool statistics counters. This allows
users to observe L3/L4 filter hit rates via ethtool -S.

Signed-off-by: Rohan G Thomas <rohan.g.thomas@altera.com>
Signed-off-by: Nazim Amirul <muhammad.nazim.amirul.nazle.asmade@altera.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Reviewed-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Link: https://patch.msgid.link/20260604083037.24407-1-muhammad.nazim.amirul.nazle.asmade@altera.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2.h b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2.h
index 51943705a2b035bcab92598d75d565418b3e0ae1..95fdf3133208751546776cd625df244111ef56c6 100644 (file)
--- a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2.h
+++ b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2.h
@@ -429,6 +429,8 @@
 #define XGMAC_TDES3_VLTV               BIT(16)
 #define XGMAC_TDES3_VT                 GENMASK(15, 0)
 #define XGMAC_TDES3_FL                 GENMASK(14, 0)
+#define XGMAC_RDES2_L4FM               BIT(28)
+#define XGMAC_RDES2_L3FM               BIT(27)
 #define XGMAC_RDES2_HL                 GENMASK(9, 0)
 #define XGMAC_RDES3_OWN                        BIT(31)
 #define XGMAC_RDES3_CTXT               BIT(30)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_descs.c b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_descs.c
index b5f200a8748406a585d6d5a955bf301fccac858a..6719ac6e395bce6f07c79798ac3521bf631ec4d9 100644 (file)
--- a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_descs.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_descs.c
@@ -27,6 +27,7 @@ static int dwxgmac2_get_rx_status(struct stmmac_extra_stats *x,
                                  struct dma_desc *p)
 {
        u32 rdes3 = le32_to_cpu(p->des3);
+       u32 rdes2 = le32_to_cpu(p->des2);
 
        if (unlikely(rdes3 & XGMAC_RDES3_OWN))
                return dma_own;
@@ -37,6 +38,11 @@ static int dwxgmac2_get_rx_status(struct stmmac_extra_stats *x,
        if (unlikely((rdes3 & XGMAC_RDES3_ES) && (rdes3 & XGMAC_RDES3_LD)))
                return discard_frame;
 
+       if (rdes2 & XGMAC_RDES2_L3FM)
+               x->l3_filter_match++;
+       if (rdes2 & XGMAC_RDES2_L4FM)
+               x->l4_filter_match++;
+
        return good_frame;
 }