From f94471f3ce74a5fbe2dc5d9687748d9127174eca Mon Sep 17 00:00:00 2001 From: Michael Chan Date: Mon, 20 Nov 2023 15:44:04 -0800 Subject: [PATCH] bnxt_en: Modify the NAPI logic for the new P7 chips Modify the NAPI logic for the new doorbell mechanism on P7 chips. These changes are compatible with the current P5 chips. In the current logic, bnxt_poll_p5() services 1 or more CQs for each MSIX. Each MSIX has an associated NQ and each NQ has 1 or more associated CQs. If any CQ reaches NAPI budget, we'll stay in polling mode and will unconditionally check and service all CQs until we exit polling. We always re-arm all CQs when we exit polling. To be compatible with the new Toggle bit mechanism in P7 chips, we need to modify the logic so that we service and re-arm the CQ only if we receive an NQE notification for work for that CQ. We add a new had_nqe_notify bit to the cp_ring_info structure and it gets set when we see the NQE notification for that CQ anytime during polling. We'll service and re-arm only the CQs with the had_nqe_notify bits set. Reviewed-by: Somnath Kotur Reviewed-by: Pavan Chebbi Signed-off-by: Michael Chan Link: https://lore.kernel.org/r/20231120234405.194542-13-michael.chan@broadcom.com Signed-off-by: Jakub Kicinski --- drivers/net/ethernet/broadcom/bnxt/bnxt.c | 10 ++++++++-- drivers/net/ethernet/broadcom/bnxt/bnxt.h | 2 ++ 2 files changed, 10 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c index b2cf429531302..f968bf12989b6 100644 --- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c @@ -2854,8 +2854,11 @@ static int __bnxt_poll_cqs(struct bnxt *bp, struct bnxt_napi *bnapi, int budget) for (i = 0; i < cpr->cp_ring_count; i++) { struct bnxt_cp_ring_info *cpr2 = &cpr->cp_ring_arr[i]; - work_done += __bnxt_poll_work(bp, cpr2, budget - work_done); - cpr->has_more_work |= cpr2->has_more_work; + if (cpr2->had_nqe_notify) { + work_done += __bnxt_poll_work(bp, cpr2, + budget - work_done); + cpr->has_more_work |= cpr2->has_more_work; + } } return work_done; } @@ -2876,6 +2879,8 @@ static void __bnxt_poll_cqs_done(struct bnxt *bp, struct bnxt_napi *bnapi, DB_RING_IDX(db, cpr2->cp_raw_cons), db->doorbell); cpr2->had_work_done = 0; + if (dbr_type == DBR_TYPE_CQ_ARMALL) + cpr2->had_nqe_notify = 0; } } __bnxt_poll_work_done(bp, bnapi, budget); @@ -2934,6 +2939,7 @@ static int bnxt_poll_p5(struct napi_struct *napi, int budget) idx = BNXT_NQ_HDL_IDX(idx); cpr2 = &cpr->cp_ring_arr[idx]; + cpr2->had_nqe_notify = 1; work_done += __bnxt_poll_work(bp, cpr2, budget - work_done); cpr->has_more_work |= cpr2->has_more_work; diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.h b/drivers/net/ethernet/broadcom/bnxt/bnxt.h index 17e1881c8a27c..b287e4a9adff4 100644 --- a/drivers/net/ethernet/broadcom/bnxt/bnxt.h +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.h @@ -1017,6 +1017,8 @@ struct bnxt_cp_ring_info { u8 had_work_done:1; u8 has_more_work:1; + u8 had_nqe_notify:1; + u8 cp_ring_type; u8 cp_idx; -- 2.30.2