lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <20231201223924.26955-6-michael.chan@broadcom.com>
Date: Fri,  1 Dec 2023 14:39:14 -0800
From: Michael Chan <michael.chan@...adcom.com>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	gospo@...adcom.com
Subject: [PATCH net-next 05/15] bnxt_en: Implement the new toggle bit doorbell mechanism on P7 chips

The new chip family passes the Toggle bits to the driver in the NQE
notification.  The driver now stores this value and sends it back to
hardware when it re-arms the RX and TX CQs.  Together with the earlier
patch that guarantees the driver will only re-arm the CQ at the end of
NAPI polling if it has seen a new NQE, this method allows the hardware
to detect any dropped doorbells.

Signed-off-by: Michael Chan <michael.chan@...adcom.com>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt.c | 17 +++++++++++++----
 drivers/net/ethernet/broadcom/bnxt/bnxt.h |  1 +
 2 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index a17de1aceff4..d4da55e01b2c 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -2880,13 +2880,18 @@ static void __bnxt_poll_cqs_done(struct bnxt *bp, struct bnxt_napi *bnapi,
 		struct bnxt_db_info *db;
 
 		if (cpr2->had_work_done) {
+			u32 tgl = 0;
+
+			if (dbr_type == DBR_TYPE_CQ_ARMALL) {
+				cpr2->had_nqe_notify = 0;
+				tgl = cpr2->toggle;
+			}
 			db = &cpr2->cp_db;
-			bnxt_writeq(bp, db->db_key64 | dbr_type |
+			bnxt_writeq(bp,
+				    db->db_key64 | dbr_type | DB_TOGGLE(tgl) |
 				    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);
@@ -2912,6 +2917,8 @@ static int bnxt_poll_p5(struct napi_struct *napi, int budget)
 		work_done = __bnxt_poll_cqs(bp, bnapi, budget);
 	}
 	while (1) {
+		u16 type;
+
 		cons = RING_CMP(raw_cons);
 		nqcmp = &cpr->nq_desc_ring[CP_RING(cons)][CP_IDX(cons)];
 
@@ -2933,7 +2940,8 @@ static int bnxt_poll_p5(struct napi_struct *napi, int budget)
 		 */
 		dma_rmb();
 
-		if (nqcmp->type == cpu_to_le16(NQ_CN_TYPE_CQ_NOTIFICATION)) {
+		type = le16_to_cpu(nqcmp->type);
+		if (NQE_CN_TYPE(type) == NQ_CN_TYPE_CQ_NOTIFICATION) {
 			u32 idx = le32_to_cpu(nqcmp->cq_handle_low);
 			u32 cq_type = BNXT_NQ_HDL_TYPE(idx);
 			struct bnxt_cp_ring_info *cpr2;
@@ -2946,6 +2954,7 @@ 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;
+			cpr2->toggle = NQE_CN_TOGGLE(type);
 			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 6d96f66dc8c0..79b4deb45cfb 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
@@ -1038,6 +1038,7 @@ struct bnxt_cp_ring_info {
 	u8			had_work_done:1;
 	u8			has_more_work:1;
 	u8			had_nqe_notify:1;
+	u8			toggle;
 
 	u8			cp_ring_type;
 	u8			cp_idx;
-- 
2.30.1


Download attachment "smime.p7s" of type "application/pkcs7-signature" (4209 bytes)

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ