diff mbox series

[net-next,v2,1/6] bnxt_en: share NQ ring sw_stats memory with subrings

Message ID 20240501003056.100607-2-michael.chan@broadcom.com (mailing list archive)
State Accepted
Commit a75fbb3aa47a62d76d8b07b49db9e2f0e08fbba7
Delegated to: Netdev Maintainers
Headers show
Series bnxt_en: Updates for net-next | 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: 926 this patch: 926
netdev/build_tools success No tools touched, skip
netdev/cc_maintainers success CCed 4 of 4 maintainers
netdev/build_clang success Errors and warnings before: 937 this patch: 937
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: 941 this patch: 941
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 166 lines checked
netdev/build_clang_rust success No Rust files in patch. Skipping build
netdev/kdoc success Errors and warnings before: 2 this patch: 2
netdev/source_inline success Was 0 now: 0
netdev/contest success net-next-2024-05-02--06-00 (tests: 996)

Commit Message

Michael Chan May 1, 2024, 12:30 a.m. UTC 
From: Edwin Peer <edwin.peer@broadcom.com>

On P5_PLUS chips and later, the NQ rings have subrings for RX and TX
completions respectively. These subrings are passed to the poll
function instead of the base NQ, but each ring carries its own
copy of the software ring statistics.

For stats to be conveniently accessible in __bnxt_poll_work(), the
statistics memory should either be shared between the NQ and its
subrings or the subrings need to be included in the ethtool stats
aggregation logic. This patch opts for the former, because it's more
efficient and less confusing having the software statistics for a
ring exist in a single place.

Before this patch, the counter will not be displayed if the "wrong"
cpr->sw_stats was used to increment a counter.

Link: https://lore.kernel.org/netdev/CACKFLikEhVAJA+osD7UjQNotdGte+fth7zOy7yDdLkTyFk9Pyw@mail.gmail.com/
Signed-off-by: Edwin Peer <edwin.peer@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt.c     | 40 +++++++++++--------
 drivers/net/ethernet/broadcom/bnxt/bnxt.h     |  2 +-
 .../net/ethernet/broadcom/bnxt/bnxt_ethtool.c |  4 +-
 3 files changed, 27 insertions(+), 19 deletions(-)

Comments

Simon Horman May 2, 2024, 9:37 a.m. UTC | #1 
On Tue, Apr 30, 2024 at 05:30:51PM -0700, Michael Chan wrote:
> From: Edwin Peer <edwin.peer@broadcom.com>
> 
> On P5_PLUS chips and later, the NQ rings have subrings for RX and TX
> completions respectively. These subrings are passed to the poll
> function instead of the base NQ, but each ring carries its own
> copy of the software ring statistics.
> 
> For stats to be conveniently accessible in __bnxt_poll_work(), the
> statistics memory should either be shared between the NQ and its
> subrings or the subrings need to be included in the ethtool stats
> aggregation logic. This patch opts for the former, because it's more
> efficient and less confusing having the software statistics for a
> ring exist in a single place.
> 
> Before this patch, the counter will not be displayed if the "wrong"
> cpr->sw_stats was used to increment a counter.
> 
> Link: https://lore.kernel.org/netdev/CACKFLikEhVAJA+osD7UjQNotdGte+fth7zOy7yDdLkTyFk9Pyw@mail.gmail.com/
> Signed-off-by: Edwin Peer <edwin.peer@broadcom.com>
> Signed-off-by: Michael Chan <michael.chan@broadcom.com>

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

Patch

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index be96bb494ae6..98bff01b89ff 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -1811,7 +1811,7 @@  static inline struct sk_buff *bnxt_tpa_end(struct bnxt *bp,
 		skb = bnxt_copy_skb(bnapi, data_ptr, len, mapping);
 		if (!skb) {
 			bnxt_abort_tpa(cpr, idx, agg_bufs);
-			cpr->bnapi->cp_ring.sw_stats.rx.rx_oom_discards += 1;
+			cpr->sw_stats->rx.rx_oom_discards += 1;
 			return NULL;
 		}
 	} else {
@@ -1821,7 +1821,7 @@  static inline struct sk_buff *bnxt_tpa_end(struct bnxt *bp,
 		new_data = __bnxt_alloc_rx_frag(bp, &new_mapping, GFP_ATOMIC);
 		if (!new_data) {
 			bnxt_abort_tpa(cpr, idx, agg_bufs);
-			cpr->bnapi->cp_ring.sw_stats.rx.rx_oom_discards += 1;
+			cpr->sw_stats->rx.rx_oom_discards += 1;
 			return NULL;
 		}
 
@@ -1837,7 +1837,7 @@  static inline struct sk_buff *bnxt_tpa_end(struct bnxt *bp,
 		if (!skb) {
 			skb_free_frag(data);
 			bnxt_abort_tpa(cpr, idx, agg_bufs);
-			cpr->bnapi->cp_ring.sw_stats.rx.rx_oom_discards += 1;
+			cpr->sw_stats->rx.rx_oom_discards += 1;
 			return NULL;
 		}
 		skb_reserve(skb, bp->rx_offset);
@@ -1848,7 +1848,7 @@  static inline struct sk_buff *bnxt_tpa_end(struct bnxt *bp,
 		skb = bnxt_rx_agg_pages_skb(bp, cpr, skb, idx, agg_bufs, true);
 		if (!skb) {
 			/* Page reuse already handled by bnxt_rx_pages(). */
-			cpr->bnapi->cp_ring.sw_stats.rx.rx_oom_discards += 1;
+			cpr->sw_stats->rx.rx_oom_discards += 1;
 			return NULL;
 		}
 	}
@@ -2106,7 +2106,7 @@  static int bnxt_rx_pkt(struct bnxt *bp, struct bnxt_cp_ring_info *cpr,
 
 		rc = -EIO;
 		if (rx_err & RX_CMPL_ERRORS_BUFFER_ERROR_MASK) {
-			bnapi->cp_ring.sw_stats.rx.rx_buf_errors++;
+			bnapi->cp_ring.sw_stats->rx.rx_buf_errors++;
 			if (!(bp->flags & BNXT_FLAG_CHIP_P5_PLUS) &&
 			    !(bp->fw_cap & BNXT_FW_CAP_RING_MONITOR)) {
 				netdev_warn_once(bp->dev, "RX buffer error %x\n",
@@ -2222,7 +2222,7 @@  static int bnxt_rx_pkt(struct bnxt *bp, struct bnxt_cp_ring_info *cpr,
 	} else {
 		if (rxcmp1->rx_cmp_cfa_code_errors_v2 & RX_CMP_L4_CS_ERR_BITS) {
 			if (dev->features & NETIF_F_RXCSUM)
-				bnapi->cp_ring.sw_stats.rx.rx_l4_csum_errors++;
+				bnapi->cp_ring.sw_stats->rx.rx_l4_csum_errors++;
 		}
 	}
 
@@ -2259,7 +2259,7 @@  static int bnxt_rx_pkt(struct bnxt *bp, struct bnxt_cp_ring_info *cpr,
 	return rc;
 
 oom_next_rx:
-	cpr->bnapi->cp_ring.sw_stats.rx.rx_oom_discards += 1;
+	cpr->sw_stats->rx.rx_oom_discards += 1;
 	rc = -ENOMEM;
 	goto next_rx;
 }
@@ -2308,7 +2308,7 @@  static int bnxt_force_rx_discard(struct bnxt *bp,
 	}
 	rc = bnxt_rx_pkt(bp, cpr, raw_cons, event);
 	if (rc && rc != -EBUSY)
-		cpr->bnapi->cp_ring.sw_stats.rx.rx_netpoll_discards += 1;
+		cpr->sw_stats->rx.rx_netpoll_discards += 1;
 	return rc;
 }
 
@@ -3951,6 +3951,7 @@  static int bnxt_alloc_cp_rings(struct bnxt *bp)
 			if (rc)
 				return rc;
 			cpr2->bnapi = bnapi;
+			cpr2->sw_stats = cpr->sw_stats;
 			cpr2->cp_idx = k;
 			if (!k && rx) {
 				bp->rx_ring[i].rx_cpr = cpr2;
@@ -4792,6 +4793,9 @@  static void bnxt_free_ring_stats(struct bnxt *bp)
 		struct bnxt_cp_ring_info *cpr = &bnapi->cp_ring;
 
 		bnxt_free_stats_mem(bp, &cpr->stats);
+
+		kfree(cpr->sw_stats);
+		cpr->sw_stats = NULL;
 	}
 }
 
@@ -4806,6 +4810,10 @@  static int bnxt_alloc_stats(struct bnxt *bp)
 		struct bnxt_napi *bnapi = bp->bnapi[i];
 		struct bnxt_cp_ring_info *cpr = &bnapi->cp_ring;
 
+		cpr->sw_stats = kzalloc(sizeof(*cpr->sw_stats), GFP_KERNEL);
+		if (!cpr->sw_stats)
+			return -ENOMEM;
+
 		cpr->stats.len = size;
 		rc = bnxt_alloc_stats_mem(bp, &cpr->stats, !i);
 		if (rc)
@@ -10811,9 +10819,9 @@  static void bnxt_disable_napi(struct bnxt *bp)
 
 		cpr = &bnapi->cp_ring;
 		if (bnapi->tx_fault)
-			cpr->sw_stats.tx.tx_resets++;
+			cpr->sw_stats->tx.tx_resets++;
 		if (bnapi->in_reset)
-			cpr->sw_stats.rx.rx_resets++;
+			cpr->sw_stats->rx.rx_resets++;
 		napi_disable(&bnapi->napi);
 		if (bnapi->rx_ring)
 			cancel_work_sync(&cpr->dim.work);
@@ -12338,8 +12346,8 @@  static void bnxt_get_ring_stats(struct bnxt *bp,
 		stats->tx_dropped += BNXT_GET_RING_STATS64(sw, tx_error_pkts);
 
 		stats->rx_dropped +=
-			cpr->sw_stats.rx.rx_netpoll_discards +
-			cpr->sw_stats.rx.rx_oom_discards;
+			cpr->sw_stats->rx.rx_netpoll_discards +
+			cpr->sw_stats->rx.rx_oom_discards;
 	}
 }
 
@@ -12406,7 +12414,7 @@  static void bnxt_get_one_ring_err_stats(struct bnxt *bp,
 					struct bnxt_total_ring_err_stats *stats,
 					struct bnxt_cp_ring_info *cpr)
 {
-	struct bnxt_sw_stats *sw_stats = &cpr->sw_stats;
+	struct bnxt_sw_stats *sw_stats = cpr->sw_stats;
 	u64 *hw_stats = cpr->stats.sw_stats;
 
 	stats->rx_total_l4_csum_errors += sw_stats->rx.rx_l4_csum_errors;
@@ -13249,7 +13257,7 @@  static void bnxt_rx_ring_reset(struct bnxt *bp)
 		rxr->bnapi->in_reset = false;
 		bnxt_alloc_one_rx_ring(bp, i);
 		cpr = &rxr->bnapi->cp_ring;
-		cpr->sw_stats.rx.rx_resets++;
+		cpr->sw_stats->rx.rx_resets++;
 		if (bp->flags & BNXT_FLAG_AGG_RINGS)
 			bnxt_db_write(bp, &rxr->rx_agg_db, rxr->rx_agg_prod);
 		bnxt_db_write(bp, &rxr->rx_db, rxr->rx_prod);
@@ -13461,7 +13469,7 @@  static void bnxt_chk_missed_irq(struct bnxt *bp)
 			bnxt_dbg_hwrm_ring_info_get(bp,
 				DBG_RING_INFO_GET_REQ_RING_TYPE_L2_CMPL,
 				fw_ring_id, &val[0], &val[1]);
-			cpr->sw_stats.cmn.missed_irqs++;
+			cpr->sw_stats->cmn.missed_irqs++;
 		}
 	}
 }
@@ -14769,7 +14777,7 @@  static void bnxt_get_queue_stats_rx(struct net_device *dev, int i,
 	stats->bytes += BNXT_GET_RING_STATS64(sw, rx_mcast_bytes);
 	stats->bytes += BNXT_GET_RING_STATS64(sw, rx_bcast_bytes);
 
-	stats->alloc_fail = cpr->sw_stats.rx.rx_oom_discards;
+	stats->alloc_fail = cpr->sw_stats->rx.rx_oom_discards;
 }
 
 static void bnxt_get_queue_stats_tx(struct net_device *dev, int i,
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.h b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
index ad57ef051798..631b0039d72b 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
@@ -1152,7 +1152,7 @@  struct bnxt_cp_ring_info {
 	struct bnxt_stats_mem	stats;
 	u32			hw_stats_ctx_id;
 
-	struct bnxt_sw_stats	sw_stats;
+	struct bnxt_sw_stats	*sw_stats;
 
 	struct bnxt_ring_struct	cp_ring_struct;
 
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
index 68444234b268..6de3cfcea90f 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
@@ -631,13 +631,13 @@  static void bnxt_get_ethtool_stats(struct net_device *dev,
 			buf[j] = sw_stats[k];
 
 skip_tpa_ring_stats:
-		sw = (u64 *)&cpr->sw_stats.rx;
+		sw = (u64 *)&cpr->sw_stats->rx;
 		if (is_rx_ring(bp, i)) {
 			for (k = 0; k < NUM_RING_RX_SW_STATS; j++, k++)
 				buf[j] = sw[k];
 		}
 
-		sw = (u64 *)&cpr->sw_stats.cmn;
+		sw = (u64 *)&cpr->sw_stats->cmn;
 		for (k = 0; k < NUM_RING_CMN_SW_STATS; j++, k++)
 			buf[j] = sw[k];
 	}