From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5BCAC6D6E4; Mon, 8 Jan 2024 15:13:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="aJMp9bzY" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B5FA8C433CA; Mon, 8 Jan 2024 15:13:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1704726813; bh=uddFT+UCuzc/PkMTKeMHOiIHSOlMvbNaZPv689opRdM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=aJMp9bzY2653XIjN5Jq3yfHFpqnjC5AYhm1FnEundptLDbp8zkE0aKlAeMFXPjXLO ZS9xb/hfw0mB1IJbmUlDGBIguDzf58scb6Ru7W9AvW3x80mTgTZfsj5/Y2E9AcaB36 m1W6q/dFZ9HkbCVtViMq6CbfF0ZGb78dHZuZb9ds= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Naveen Mamindlapalli , Sunil Kovvuri Goutham , Nithin Kumar Dabilpuram , "David S. Miller" , Sasha Levin Subject: [PATCH 6.6 057/124] octeontx2-af: Always configure NIX TX link credits based on max frame size Date: Mon, 8 Jan 2024 16:08:03 +0100 Message-ID: <20240108150605.585913580@linuxfoundation.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240108150602.976232871@linuxfoundation.org> References: <20240108150602.976232871@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Naveen Mamindlapalli [ Upstream commit a0d9528f6daf7fe8de217fa80a94d2989d2a57a7 ] Currently the NIX TX link credits are initialized based on the max frame size that can be transmitted on a link but when the MTU is changed, the NIX TX link credits are reprogrammed by the SW based on the new MTU value. Since SMQ max packet length is programmed to max frame size by default, there is a chance that NIX TX may stall while sending a max frame sized packet on the link with insufficient credits to send the packet all at once. This patch avoids stall issue by not changing the link credits dynamically when the MTU is changed. Fixes: 1c74b89171c3 ("octeontx2-af: Wait for TX link idle for credits change") Signed-off-by: Naveen Mamindlapalli Signed-off-by: Sunil Kovvuri Goutham Signed-off-by: Nithin Kumar Dabilpuram Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- .../ethernet/marvell/octeontx2/af/rvu_nix.c | 110 +----------------- 1 file changed, 3 insertions(+), 107 deletions(-) diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c b/drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c index 4227ebb4a758d..2b6ab748ce25a 100644 --- a/drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c +++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c @@ -4143,90 +4143,18 @@ static void nix_find_link_frs(struct rvu *rvu, req->minlen = minlen; } -static int -nix_config_link_credits(struct rvu *rvu, int blkaddr, int link, - u16 pcifunc, u64 tx_credits) -{ - struct rvu_hwinfo *hw = rvu->hw; - int pf = rvu_get_pf(pcifunc); - u8 cgx_id = 0, lmac_id = 0; - unsigned long poll_tmo; - bool restore_tx_en = 0; - struct nix_hw *nix_hw; - u64 cfg, sw_xoff = 0; - u32 schq = 0; - u32 credits; - int rc; - - nix_hw = get_nix_hw(rvu->hw, blkaddr); - if (!nix_hw) - return NIX_AF_ERR_INVALID_NIXBLK; - - if (tx_credits == nix_hw->tx_credits[link]) - return 0; - - /* Enable cgx tx if disabled for credits to be back */ - if (is_pf_cgxmapped(rvu, pf)) { - rvu_get_cgx_lmac_id(rvu->pf2cgxlmac_map[pf], &cgx_id, &lmac_id); - restore_tx_en = !rvu_cgx_config_tx(rvu_cgx_pdata(cgx_id, rvu), - lmac_id, true); - } - - mutex_lock(&rvu->rsrc_lock); - /* Disable new traffic to link */ - if (hw->cap.nix_shaping) { - schq = nix_get_tx_link(rvu, pcifunc); - sw_xoff = rvu_read64(rvu, blkaddr, NIX_AF_TL1X_SW_XOFF(schq)); - rvu_write64(rvu, blkaddr, - NIX_AF_TL1X_SW_XOFF(schq), BIT_ULL(0)); - } - - rc = NIX_AF_ERR_LINK_CREDITS; - poll_tmo = jiffies + usecs_to_jiffies(200000); - /* Wait for credits to return */ - do { - if (time_after(jiffies, poll_tmo)) - goto exit; - usleep_range(100, 200); - - cfg = rvu_read64(rvu, blkaddr, - NIX_AF_TX_LINKX_NORM_CREDIT(link)); - credits = (cfg >> 12) & 0xFFFFFULL; - } while (credits != nix_hw->tx_credits[link]); - - cfg &= ~(0xFFFFFULL << 12); - cfg |= (tx_credits << 12); - rvu_write64(rvu, blkaddr, NIX_AF_TX_LINKX_NORM_CREDIT(link), cfg); - rc = 0; - - nix_hw->tx_credits[link] = tx_credits; - -exit: - /* Enable traffic back */ - if (hw->cap.nix_shaping && !sw_xoff) - rvu_write64(rvu, blkaddr, NIX_AF_TL1X_SW_XOFF(schq), 0); - - /* Restore state of cgx tx */ - if (restore_tx_en) - rvu_cgx_config_tx(rvu_cgx_pdata(cgx_id, rvu), lmac_id, false); - - mutex_unlock(&rvu->rsrc_lock); - return rc; -} - int rvu_mbox_handler_nix_set_hw_frs(struct rvu *rvu, struct nix_frs_cfg *req, struct msg_rsp *rsp) { struct rvu_hwinfo *hw = rvu->hw; u16 pcifunc = req->hdr.pcifunc; int pf = rvu_get_pf(pcifunc); - int blkaddr, schq, link = -1; - struct nix_txsch *txsch; - u64 cfg, lmac_fifo_len; + int blkaddr, link = -1; struct nix_hw *nix_hw; struct rvu_pfvf *pfvf; u8 cgx = 0, lmac = 0; u16 max_mtu; + u64 cfg; blkaddr = rvu_get_blkaddr(rvu, BLKTYPE_NIX, pcifunc); if (blkaddr < 0) @@ -4247,25 +4175,6 @@ int rvu_mbox_handler_nix_set_hw_frs(struct rvu *rvu, struct nix_frs_cfg *req, if (req->update_minlen && req->minlen < NIC_HW_MIN_FRS) return NIX_AF_ERR_FRS_INVALID; - /* Check if requester wants to update SMQ's */ - if (!req->update_smq) - goto rx_frscfg; - - /* Update min/maxlen in each of the SMQ attached to this PF/VF */ - txsch = &nix_hw->txsch[NIX_TXSCH_LVL_SMQ]; - mutex_lock(&rvu->rsrc_lock); - for (schq = 0; schq < txsch->schq.max; schq++) { - if (TXSCH_MAP_FUNC(txsch->pfvf_map[schq]) != pcifunc) - continue; - cfg = rvu_read64(rvu, blkaddr, NIX_AF_SMQX_CFG(schq)); - cfg = (cfg & ~(0xFFFFULL << 8)) | ((u64)req->maxlen << 8); - if (req->update_minlen) - cfg = (cfg & ~0x7FULL) | ((u64)req->minlen & 0x7F); - rvu_write64(rvu, blkaddr, NIX_AF_SMQX_CFG(schq), cfg); - } - mutex_unlock(&rvu->rsrc_lock); - -rx_frscfg: /* Check if config is for SDP link */ if (req->sdp_link) { if (!hw->sdp_links) @@ -4288,7 +4197,6 @@ int rvu_mbox_handler_nix_set_hw_frs(struct rvu *rvu, struct nix_frs_cfg *req, if (link < 0) return NIX_AF_ERR_RX_LINK_INVALID; - linkcfg: nix_find_link_frs(rvu, req, pcifunc); @@ -4298,19 +4206,7 @@ int rvu_mbox_handler_nix_set_hw_frs(struct rvu *rvu, struct nix_frs_cfg *req, cfg = (cfg & ~0xFFFFULL) | req->minlen; rvu_write64(rvu, blkaddr, NIX_AF_RX_LINKX_CFG(link), cfg); - if (req->sdp_link || pf == 0) - return 0; - - /* Update transmit credits for CGX links */ - lmac_fifo_len = rvu_cgx_get_lmac_fifolen(rvu, cgx, lmac); - if (!lmac_fifo_len) { - dev_err(rvu->dev, - "%s: Failed to get CGX/RPM%d:LMAC%d FIFO size\n", - __func__, cgx, lmac); - return 0; - } - return nix_config_link_credits(rvu, blkaddr, link, pcifunc, - (lmac_fifo_len - req->maxlen) / 16); + return 0; } int rvu_mbox_handler_nix_set_rx_cfg(struct rvu *rvu, struct nix_rx_cfg *req, -- 2.43.0