From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-11.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CC87CC4338F for ; Wed, 11 Aug 2021 22:36:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9254B6052B for ; Wed, 11 Aug 2021 22:36:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232575AbhHKWhL (ORCPT ); Wed, 11 Aug 2021 18:37:11 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58012 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232434AbhHKWhK (ORCPT ); Wed, 11 Aug 2021 18:37:10 -0400 Received: from mail-qt1-x82c.google.com (mail-qt1-x82c.google.com [IPv6:2607:f8b0:4864:20::82c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id ACD08C061765 for ; Wed, 11 Aug 2021 15:36:46 -0700 (PDT) Received: by mail-qt1-x82c.google.com with SMTP id b1so3509308qtx.0 for ; Wed, 11 Aug 2021 15:36:46 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=PvF5qlOk0lZcfAoT1u3twGZuyWdpVaVgA3Ol022AsKE=; b=O1146MOZf2UXkwRpT3TiPs5OFLTjYtQT6A5+Pa8W8eGA1lJrIK8KIGIKHIU960Pcft vlRDF2b4xxslpA7zbyFtvn0n4TCr1LBBzYl/fStlKm2AsklthPHAB36pJMGkNjMt7ppz juBcSq26t3PWTkeqYJXJmIQYSpG5E64bTU2KE= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=PvF5qlOk0lZcfAoT1u3twGZuyWdpVaVgA3Ol022AsKE=; b=fkpHyQALf8dRZh0GvG84jOiu0ml8GsEPdPGO090Jr94BVQwgSAz+AQoI+hyXEKe3iY 9XarsM//8hgNyQkHX09NThQnK7A7sfaxQs5zL866u69gWo86vQBho8+vA7noTTm5Yqvj /LGyCQCsfIZ4tnobF377KvaNnpHjZ6PFjDD05RC27It9FnUECmTqz++s0nTtCS0mYDmr EJWICF3BxOcsSssC3yOgDyDRqh/sLRXVnQhr9Yi0991jNgU5l4pTJgrLT4ZNsmOYQdwN RX78w7IuBrPMqVmSr4BLti3cvBS9kXPGrkzgHvBpOx745fzJ8hanFsFjna0eIjr/93xH b+PQ== X-Gm-Message-State: AOAM532MppM8Ze1xitw7WWE11iWoe0llXcB1oaTVop5yjtHjdlRAS8Y1 yLjLtVrnSllpcdEiPaql7bsdL8KUtu7+3NLGHJXPow== X-Google-Smtp-Source: ABdhPJzQRY/Q1yr/NqR8IqraVMs9VEVBgeH/I4FzvUIwEkpG9+TJ6n8irXzD4nHO4RIgEGzCuLDF/7GEcdQ0xZyj/8k= X-Received: by 2002:ac8:7189:: with SMTP id w9mr951624qto.351.1628721405484; Wed, 11 Aug 2021 15:36:45 -0700 (PDT) MIME-Version: 1.0 References: <20210811213749.3276687-1-kuba@kernel.org> <20210811213749.3276687-4-kuba@kernel.org> In-Reply-To: <20210811213749.3276687-4-kuba@kernel.org> From: Michael Chan Date: Wed, 11 Aug 2021 15:36:34 -0700 Message-ID: Subject: Re: [PATCH net v2 3/4] bnxt: make sure xmit_more + errors does not miss doorbells To: Jakub Kicinski Cc: David Miller , Jeffrey Huang , Eddie Wai , Prashant Sreedharan , Andrew Gospodarek , Netdev , Edwin Peer Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="000000000000d6b48605c950408f" Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org --000000000000d6b48605c950408f Content-Type: text/plain; charset="UTF-8" On Wed, Aug 11, 2021 at 2:38 PM Jakub Kicinski wrote: > --- > v2: - netdev_warn() -> netif_warn() [Edwin] > - use correct prod value [Michael] > --- > drivers/net/ethernet/broadcom/bnxt/bnxt.c | 36 +++++++++++++++-------- > drivers/net/ethernet/broadcom/bnxt/bnxt.h | 1 + > 2 files changed, 25 insertions(+), 12 deletions(-) > > diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c > index 52f5c8405e76..79bbd6ec7ef7 100644 > --- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c > +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c > @@ -72,7 +72,8 @@ > #include "bnxt_debugfs.h" > > #define BNXT_TX_TIMEOUT (5 * HZ) > -#define BNXT_DEF_MSG_ENABLE (NETIF_MSG_DRV | NETIF_MSG_HW) > +#define BNXT_DEF_MSG_ENABLE (NETIF_MSG_DRV | NETIF_MSG_HW | \ > + NETIF_MSG_TX_ERR) > > MODULE_LICENSE("GPL"); > MODULE_DESCRIPTION("Broadcom BCM573xx network driver"); > @@ -367,6 +368,13 @@ static u16 bnxt_xmit_get_cfa_action(struct sk_buff *skb) > return md_dst->u.port_info.port_id; > } > > +static void bnxt_txr_db_kick(struct bnxt *bp, struct bnxt_tx_ring_info *txr, > + u16 prod) > +{ > + bnxt_db_write(bp, &txr->tx_db, prod); > + txr->kick_pending = 0; > +} > + > static netdev_tx_t bnxt_start_xmit(struct sk_buff *skb, struct net_device *dev) > { > struct bnxt *bp = netdev_priv(dev); > @@ -396,6 +404,8 @@ static netdev_tx_t bnxt_start_xmit(struct sk_buff *skb, struct net_device *dev) > free_size = bnxt_tx_avail(bp, txr); > if (unlikely(free_size < skb_shinfo(skb)->nr_frags + 2)) { > netif_tx_stop_queue(txq); > + if (net_ratelimit() && txr->kick_pending) > + netif_warn(bp, tx_err, dev, "bnxt: ring busy!\n"); You forgot to remove this. > return NETDEV_TX_BUSY; > } > > @@ -516,21 +526,16 @@ static netdev_tx_t bnxt_start_xmit(struct sk_buff *skb, struct net_device *dev) > normal_tx: > if (length < BNXT_MIN_PKT_SIZE) { > pad = BNXT_MIN_PKT_SIZE - length; > - if (skb_pad(skb, pad)) { > + if (skb_pad(skb, pad)) > /* SKB already freed. */ > - tx_buf->skb = NULL; > - return NETDEV_TX_OK; > - } > + goto tx_kick_pending; > length = BNXT_MIN_PKT_SIZE; > } > > mapping = dma_map_single(&pdev->dev, skb->data, len, DMA_TO_DEVICE); > > - if (unlikely(dma_mapping_error(&pdev->dev, mapping))) { > - dev_kfree_skb_any(skb); > - tx_buf->skb = NULL; > - return NETDEV_TX_OK; > - } > + if (unlikely(dma_mapping_error(&pdev->dev, mapping))) > + goto tx_free; > > dma_unmap_addr_set(tx_buf, mapping, mapping); > flags = (len << TX_BD_LEN_SHIFT) | TX_BD_TYPE_LONG_TX_BD | > @@ -617,13 +622,15 @@ static netdev_tx_t bnxt_start_xmit(struct sk_buff *skb, struct net_device *dev) > txr->tx_prod = prod; > > if (!netdev_xmit_more() || netif_xmit_stopped(txq)) > - bnxt_db_write(bp, &txr->tx_db, prod); > + bnxt_txr_db_kick(bp, txr, prod); > + else > + txr->kick_pending = 1; > > tx_done: > > if (unlikely(bnxt_tx_avail(bp, txr) <= MAX_SKB_FRAGS + 1)) { > if (netdev_xmit_more() && !tx_buf->is_push) > - bnxt_db_write(bp, &txr->tx_db, prod); > + bnxt_txr_db_kick(bp, txr, prod); > > netif_tx_stop_queue(txq); > > @@ -661,7 +668,12 @@ static netdev_tx_t bnxt_start_xmit(struct sk_buff *skb, struct net_device *dev) > PCI_DMA_TODEVICE); > } > > +tx_free: > dev_kfree_skb_any(skb); > +tx_kick_pending: > + tx_buf->skb = NULL; I think we should remove the setting of tx_buf->skb to NULL in the tx_dma_error path since we are setting it here now. > + if (txr->kick_pending) > + bnxt_txr_db_kick(bp, txr, txr->tx_prod); > return NETDEV_TX_OK; > } > --000000000000d6b48605c950408f Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIIQbQYJKoZIhvcNAQcCoIIQXjCCEFoCAQExDzANBglghkgBZQMEAgEFADALBgkqhkiG9w0BBwGg gg3EMIIFDTCCA/WgAwIBAgIQeEqpED+lv77edQixNJMdADANBgkqhkiG9w0BAQsFADBMMSAwHgYD VQQLExdHbG9iYWxTaWduIFJvb3QgQ0EgLSBSMzETMBEGA1UEChMKR2xvYmFsU2lnbjETMBEGA1UE AxMKR2xvYmFsU2lnbjAeFw0yMDA5MTYwMDAwMDBaFw0yODA5MTYwMDAwMDBaMFsxCzAJBgNVBAYT AkJFMRkwFwYDVQQKExBHbG9iYWxTaWduIG52LXNhMTEwLwYDVQQDEyhHbG9iYWxTaWduIEdDQyBS MyBQZXJzb25hbFNpZ24gMiBDQSAyMDIwMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA vbCmXCcsbZ/a0fRIQMBxp4gJnnyeneFYpEtNydrZZ+GeKSMdHiDgXD1UnRSIudKo+moQ6YlCOu4t rVWO/EiXfYnK7zeop26ry1RpKtogB7/O115zultAz64ydQYLe+a1e/czkALg3sgTcOOcFZTXk38e aqsXsipoX1vsNurqPtnC27TWsA7pk4uKXscFjkeUE8JZu9BDKaswZygxBOPBQBwrA5+20Wxlk6k1 e6EKaaNaNZUy30q3ArEf30ZDpXyfCtiXnupjSK8WU2cK4qsEtj09JS4+mhi0CTCrCnXAzum3tgcH cHRg0prcSzzEUDQWoFxyuqwiwhHu3sPQNmFOMwIDAQABo4IB2jCCAdYwDgYDVR0PAQH/BAQDAgGG MGAGA1UdJQRZMFcGCCsGAQUFBwMCBggrBgEFBQcDBAYKKwYBBAGCNxQCAgYKKwYBBAGCNwoDBAYJ KwYBBAGCNxUGBgorBgEEAYI3CgMMBggrBgEFBQcDBwYIKwYBBQUHAxEwEgYDVR0TAQH/BAgwBgEB /wIBADAdBgNVHQ4EFgQUljPR5lgXWzR1ioFWZNW+SN6hj88wHwYDVR0jBBgwFoAUj/BLf6guRSSu TVD6Y5qL3uLdG7wwegYIKwYBBQUHAQEEbjBsMC0GCCsGAQUFBzABhiFodHRwOi8vb2NzcC5nbG9i YWxzaWduLmNvbS9yb290cjMwOwYIKwYBBQUHMAKGL2h0dHA6Ly9zZWN1cmUuZ2xvYmFsc2lnbi5j b20vY2FjZXJ0L3Jvb3QtcjMuY3J0MDYGA1UdHwQvMC0wK6ApoCeGJWh0dHA6Ly9jcmwuZ2xvYmFs c2lnbi5jb20vcm9vdC1yMy5jcmwwWgYDVR0gBFMwUTALBgkrBgEEAaAyASgwQgYKKwYBBAGgMgEo CjA0MDIGCCsGAQUFBwIBFiZodHRwczovL3d3dy5nbG9iYWxzaWduLmNvbS9yZXBvc2l0b3J5LzAN BgkqhkiG9w0BAQsFAAOCAQEAdAXk/XCnDeAOd9nNEUvWPxblOQ/5o/q6OIeTYvoEvUUi2qHUOtbf jBGdTptFsXXe4RgjVF9b6DuizgYfy+cILmvi5hfk3Iq8MAZsgtW+A/otQsJvK2wRatLE61RbzkX8 9/OXEZ1zT7t/q2RiJqzpvV8NChxIj+P7WTtepPm9AIj0Keue+gS2qvzAZAY34ZZeRHgA7g5O4TPJ /oTd+4rgiU++wLDlcZYd/slFkaT3xg4qWDepEMjT4T1qFOQIL+ijUArYS4owpPg9NISTKa1qqKWJ jFoyms0d0GwOniIIbBvhI2MJ7BSY9MYtWVT5jJO3tsVHwj4cp92CSFuGwunFMzCCA18wggJHoAMC AQICCwQAAAAAASFYUwiiMA0GCSqGSIb3DQEBCwUAMEwxIDAeBgNVBAsTF0dsb2JhbFNpZ24gUm9v dCBDQSAtIFIzMRMwEQYDVQQKEwpHbG9iYWxTaWduMRMwEQYDVQQDEwpHbG9iYWxTaWduMB4XDTA5 MDMxODEwMDAwMFoXDTI5MDMxODEwMDAwMFowTDEgMB4GA1UECxMXR2xvYmFsU2lnbiBSb290IENB IC0gUjMxEzARBgNVBAoTCkdsb2JhbFNpZ24xEzARBgNVBAMTCkdsb2JhbFNpZ24wggEiMA0GCSqG SIb3DQEBAQUAA4IBDwAwggEKAoIBAQDMJXaQeQZ4Ihb1wIO2hMoonv0FdhHFrYhy/EYCQ8eyip0E XyTLLkvhYIJG4VKrDIFHcGzdZNHr9SyjD4I9DCuul9e2FIYQebs7E4B3jAjhSdJqYi8fXvqWaN+J J5U4nwbXPsnLJlkNc96wyOkmDoMVxu9bi9IEYMpJpij2aTv2y8gokeWdimFXN6x0FNx04Druci8u nPvQu7/1PQDhBjPogiuuU6Y6FnOM3UEOIDrAtKeh6bJPkC4yYOlXy7kEkmho5TgmYHWyn3f/kRTv riBJ/K1AFUjRAjFhGV64l++td7dkmnq/X8ET75ti+w1s4FRpFqkD2m7pg5NxdsZphYIXAgMBAAGj QjBAMA4GA1UdDwEB/wQEAwIBBjAPBgNVHRMBAf8EBTADAQH/MB0GA1UdDgQWBBSP8Et/qC5FJK5N UPpjmove4t0bvDANBgkqhkiG9w0BAQsFAAOCAQEAS0DbwFCq/sgM7/eWVEVJu5YACUGssxOGhigH M8pr5nS5ugAtrqQK0/Xx8Q+Kv3NnSoPHRHt44K9ubG8DKY4zOUXDjuS5V2yq/BKW7FPGLeQkbLmU Y/vcU2hnVj6DuM81IcPJaP7O2sJTqsyQiunwXUaMld16WCgaLx3ezQA3QY/tRG3XUyiXfvNnBB4V 14qWtNPeTCekTBtzc3b0F5nCH3oO4y0IrQocLP88q1UOD5F+NuvDV0m+4S4tfGCLw0FREyOdzvcy a5QBqJnnLDMfOjsl0oZAzjsshnjJYS8Uuu7bVW/fhO4FCU29KNhyztNiUGUe65KXgzHZs7XKR1g/ XzCCBUwwggQ0oAMCAQICDBB5T5jqFt6c/NEwmzANBgkqhkiG9w0BAQsFADBbMQswCQYDVQQGEwJC RTEZMBcGA1UEChMQR2xvYmFsU2lnbiBudi1zYTExMC8GA1UEAxMoR2xvYmFsU2lnbiBHQ0MgUjMg UGVyc29uYWxTaWduIDIgQ0EgMjAyMDAeFw0yMTAyMjIxNDE0MTRaFw0yMjA5MjIxNDQzNDhaMIGO MQswCQYDVQQGEwJJTjESMBAGA1UECBMJS2FybmF0YWthMRIwEAYDVQQHEwlCYW5nYWxvcmUxFjAU BgNVBAoTDUJyb2FkY29tIEluYy4xFTATBgNVBAMTDE1pY2hhZWwgQ2hhbjEoMCYGCSqGSIb3DQEJ ARYZbWljaGFlbC5jaGFuQGJyb2FkY29tLmNvbTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoC ggEBANtwBQrLJBrTcbQ1kmjdo+NJT2hFaBFsw1IOi34uVzWz21AZUqQkNVktkT740rYuB1m1No7W EBvfLuKxbgQO2pHk9mTUiTHsrX2CHIw835Du8Co2jEuIqAsocz53NwYmk4Sj0/HqAfxgtHEleK2l CR56TX8FjvCKYDsIsXIjMzm3M7apx8CQWT6DxwfrDBu607V6LkfuHp2/BZM2GvIiWqy2soKnUqjx xV4Em+0wQoEIR2kPG6yiZNtUK0tNCaZejYU/Mf/bzdKSwud3pLgHV8ls83y2OU/ha9xgJMLpRswv xucFCxMsPmk0yoVmpbr92kIpLm+TomNZsL++LcDRa2ECAwEAAaOCAdowggHWMA4GA1UdDwEB/wQE AwIFoDCBowYIKwYBBQUHAQEEgZYwgZMwTgYIKwYBBQUHMAKGQmh0dHA6Ly9zZWN1cmUuZ2xvYmFs c2lnbi5jb20vY2FjZXJ0L2dzZ2NjcjNwZXJzb25hbHNpZ24yY2EyMDIwLmNydDBBBggrBgEFBQcw AYY1aHR0cDovL29jc3AuZ2xvYmFsc2lnbi5jb20vZ3NnY2NyM3BlcnNvbmFsc2lnbjJjYTIwMjAw TQYDVR0gBEYwRDBCBgorBgEEAaAyASgKMDQwMgYIKwYBBQUHAgEWJmh0dHBzOi8vd3d3Lmdsb2Jh bHNpZ24uY29tL3JlcG9zaXRvcnkvMAkGA1UdEwQCMAAwSQYDVR0fBEIwQDA+oDygOoY4aHR0cDov L2NybC5nbG9iYWxzaWduLmNvbS9nc2djY3IzcGVyc29uYWxzaWduMmNhMjAyMC5jcmwwJAYDVR0R BB0wG4EZbWljaGFlbC5jaGFuQGJyb2FkY29tLmNvbTATBgNVHSUEDDAKBggrBgEFBQcDBDAfBgNV HSMEGDAWgBSWM9HmWBdbNHWKgVZk1b5I3qGPzzAdBgNVHQ4EFgQUz2bMvqtXpXM0u3vAvRkalz60 CjswDQYJKoZIhvcNAQELBQADggEBAGUgeqqI/q2pkETeLr6oS7nnm1bkeNmtnJ2bnybNO/RdrbPj DHVSiDCCrWr6xrc+q6OiZDKm0Ieq6BN+Wfr8h5mCkZMUdJikI85WcQTRk6EEF2lzIiaULmFD7U15 FSWQptLx+kiu63idTII4r3k/7+dJ5AhLRr4WCoXEme2GZkfSbYC3fEL46tb1w7w+25OEFCv1MtDZ 1CHkODrS2JGwDQxXKmyF64MhJiOutWHmqoGmLJVz1jnDvClsYtgT4zcNtoqKtjpWDYAefncWDPIQ DauX1eWVM+KepL7zoSNzVbTipc65WuZFLR8ngOwkpknqvS9n/nKd885m23oIocC+GA4xggJtMIIC aQIBATBrMFsxCzAJBgNVBAYTAkJFMRkwFwYDVQQKExBHbG9iYWxTaWduIG52LXNhMTEwLwYDVQQD EyhHbG9iYWxTaWduIEdDQyBSMyBQZXJzb25hbFNpZ24gMiBDQSAyMDIwAgwQeU+Y6hbenPzRMJsw DQYJYIZIAWUDBAIBBQCggdQwLwYJKoZIhvcNAQkEMSIEIEOK4jUS2npWWkfRZoDCaRiQnDkDhmha 0SS4UCV2oQjIMBgGCSqGSIb3DQEJAzELBgkqhkiG9w0BBwEwHAYJKoZIhvcNAQkFMQ8XDTIxMDgx MTIyMzY0NVowaQYJKoZIhvcNAQkPMVwwWjALBglghkgBZQMEASowCwYJYIZIAWUDBAEWMAsGCWCG SAFlAwQBAjAKBggqhkiG9w0DBzALBgkqhkiG9w0BAQowCwYJKoZIhvcNAQEHMAsGCWCGSAFlAwQC ATANBgkqhkiG9w0BAQEFAASCAQCD7w8eklrJ95AkxWo4cVtEJwQh3nddXLAXBBSraOFazSZ1zHGF dQx598z0Q8t9KBll1zScWPf7xlw18p+DvMnRGDnSRJLfeavnZOrstM7kthqreJwnD0J/zUk//sTA ZPtVs5dGHtr0VCu4eRgHdzThjN9pU5E4yAyvuuMQl/IAWMXezXpWAWZP/FJwZqbqkLkFlCB7Umil pliZbFPVqHZQHNNGNfqZlT8ZT8lsBYBz/iJC2ihLAxi52890XlPlcqwJlqYClgMbXwTq6bVqDNRj L7r6BocmygFfJc6pRCyktHbLBcjy4W3Ug3FVZFa4AcpWWeQqoBN3tkV4N8sypmkS --000000000000d6b48605c950408f--