git: 660099c985e8 - main - ixgbe: Restore missed packet accounting

The branch main has been updated by kbowling:

URL: https://cgit.FreeBSD.org/src/commit/?id=660099c985e8bfc931b01398715441c90cf0d4db

commit 660099c985e8bfc931b01398715441c90cf0d4db
Author:     Kevin Bowling <[email protected]>
AuthorDate: 2026-08-10 15:09:29 +0000
Commit:     Kevin Bowling <[email protected]>
CommitDate: 2026-08-10 16:33:12 +0000

    ixgbe: Restore missed packet accounting
    
    missed_rx and total_missed_rx are never populated.  As a result, the
    GPRC erratum workaround does not remove missed packets and iqdrops
    always remains zero.  The rx_missed_packets sysctl and input-error total
    also expose only MPC bank zero.
    
    Read and accumulate all eight MPC banks.  Use the interval total to
    correct GPRC and the cumulative total for iqdrops, input errors, and the
    aggregate sysctl.  This matches DPDK's coverage of the hardware banks.
    
    MFC after:      2 weeks
---
 sys/dev/ixgbe/if_ix.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/sys/dev/ixgbe/if_ix.c b/sys/dev/ixgbe/if_ix.c
index 252ae352829e..9a998b03dbd7 100644
--- a/sys/dev/ixgbe/if_ix.c
+++ b/sys/dev/ixgbe/if_ix.c
@@ -1923,7 +1923,7 @@ ixgbe_update_stats_counters(struct ixgbe_softc *sc)
 {
 	struct ixgbe_hw *hw = &sc->hw;
 	struct ixgbe_hw_stats *stats = &sc->stats.pf;
-	u32 missed_rx = 0, bprc, lxon, lxoff;
+	u32 missed_rx = 0, mpc, bprc, lxon, lxoff;
 	u32 lxoffrxc;
 	u64 total_missed_rx = 0, total;
 
@@ -1931,7 +1931,13 @@ ixgbe_update_stats_counters(struct ixgbe_softc *sc)
 	stats->illerrc += IXGBE_READ_REG(hw, IXGBE_ILLERRC);
 	stats->errbc += IXGBE_READ_REG(hw, IXGBE_ERRBC);
 	stats->mspdc += IXGBE_READ_REG(hw, IXGBE_MSPDC);
-	stats->mpc[0] += IXGBE_READ_REG(hw, IXGBE_MPC(0));
+	for (int i = 0; i < nitems(stats->mpc); i++) {
+		mpc = IXGBE_READ_REG(hw, IXGBE_MPC(i));
+		missed_rx += mpc;
+		stats->mpc[i] += mpc;
+		total_missed_rx += stats->mpc[i];
+	}
+	stats->mpctotal = total_missed_rx;
 
 	for (int i = 0; i < 16; i++) {
 		stats->qprc[i] += IXGBE_READ_REG(hw, IXGBE_QPRC(i));
@@ -2053,7 +2059,7 @@ ixgbe_update_stats_counters(struct ixgbe_softc *sc)
 	 * - jabber count.
 	 */
 	IXGBE_SET_IERRORS(sc, stats->crcerrs + stats->illerrc +
-	    stats->mpc[0] + stats->rlec + stats->ruc + stats->rfc +
+	    stats->mpctotal + stats->rlec + stats->ruc + stats->rfc +
 	    stats->roc + stats->rjc);
 } /* ixgbe_update_stats_counters */
 
@@ -2164,7 +2170,7 @@ ixgbe_add_hw_stats(struct ixgbe_softc *sc)
 	SYSCTL_ADD_UQUAD(ctx, stat_list, OID_AUTO, "rec_len_errs",
 	    CTLFLAG_RD, &stats->rlec, "Receive Length Errors");
 	SYSCTL_ADD_UQUAD(ctx, stat_list, OID_AUTO, "rx_missed_packets",
-	    CTLFLAG_RD, &stats->mpc[0], "RX Missed Packet Count");
+	    CTLFLAG_RD, &stats->mpctotal, "RX Missed Packet Count");
 
 	/* Flow Control stats */
 	SYSCTL_ADD_UQUAD(ctx, stat_list, OID_AUTO, "xon_txd",