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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , , , , Simon Horman Subject: [PATCH net v5 1/2] octeon_ep: Implement helper for iterating packets in Rx queue Date: Thu, 17 Oct 2024 13:06:50 +0300 Message-ID: <20241017100651.15863-2-amishin@t-argos.ru> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20241017100651.15863-1-amishin@t-argos.ru> References: <20241017100651.15863-1-amishin@t-argos.ru> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: ta-mail-02.ta.t-argos.ru (172.17.13.212) To ta-mail-02 (172.17.13.212) X-KSMG-Rule-ID: 1 X-KSMG-Message-Action: clean X-KSMG-AntiSpam-Lua-Profiles: 188506 [Oct 17 2024] X-KSMG-AntiSpam-Version: 6.1.0.4 X-KSMG-AntiSpam-Envelope-From: amishin@t-argos.ru X-KSMG-AntiSpam-Rate: 0 X-KSMG-AntiSpam-Status: not_detected X-KSMG-AntiSpam-Method: none X-KSMG-AntiSpam-Auth: dkim=none X-KSMG-AntiSpam-Info: LuaCore: 39 0.3.39 e168d0b3ce73b485ab2648dd465313add1404cce, {Tracking_uf_ne_domains}, {Tracking_from_domain_doesnt_match_to}, mx1.t-argos.ru.ru:7.1.1;t-argos.ru:7.1.1;d41d8cd98f00b204e9800998ecf8427e.com:7.1.1;127.0.0.199:7.1.2;lore.kernel.org:7.1.1, FromAlignment: s X-MS-Exchange-Organization-SCL: -1 X-KSMG-AntiSpam-Interceptor-Info: scan successful X-KSMG-AntiPhishing: Clean, bases: 2024/10/17 09:58:00 X-KSMG-AntiVirus: Kaspersky Secure Mail Gateway, version 1.1.2.30, bases: 2024/10/17 05:21:00 #26765332 X-KSMG-AntiVirus-Status: Clean, skipped Content-Type: text/plain; charset="utf-8" The common code with some packet and index manipulations is extracted and moved to newly implemented helper to make the code more readable and avoid duplication. This is a preparation for skb allocation failure handling. Found by Linux Verification Center (linuxtesting.org) with SVACE. Suggested-by: Simon Horman Suggested-by: Paolo Abeni Signed-off-by: Aleksandr Mishin Reviewed-by: Jacob Keller --- Compile tested only. v5: - Unmap paged buffer before the skb creation as suggested by Paolo (https://lore.kernel.org/all/cf656975-69b4-427e-8769-d16575774bba@redha= t.com/) v4: https://lore.kernel.org/all/20241012094950.9438-1-amishin@t-argos.ru/ - Split patch up as suggested by Jakub (https://lore.kernel.org/all/20241004073311.223efca4@kernel.org/) v3: https://lore.kernel.org/all/20240930053328.9618-1-amishin@t-argos.ru/ - Implement helper which frees current packet resources and increase index and descriptor as suggested by Simon (https://lore.kernel.org/all/20240919134812.GB1571683@kernel.org/) - v3 has been reviewed-by Simon Horman (https://lore.kernel.org/all/20240930162622.GF1310185@kernel.org/) v1: https://lore.kernel.org/all/20240906063907.9591-1-amishin@t-argos.ru/ .../net/ethernet/marvell/octeon_ep/octep_rx.c | 55 +++++++++++-------- 1 file changed, 32 insertions(+), 23 deletions(-) diff --git a/drivers/net/ethernet/marvell/octeon_ep/octep_rx.c b/drivers/ne= t/ethernet/marvell/octeon_ep/octep_rx.c index 4746a6b258f0..a889c1510518 100644 --- a/drivers/net/ethernet/marvell/octeon_ep/octep_rx.c +++ b/drivers/net/ethernet/marvell/octeon_ep/octep_rx.c @@ -336,6 +336,30 @@ static int octep_oq_check_hw_for_pkts(struct octep_dev= ice *oct, return new_pkts; } =20 +/** + * octep_oq_next_pkt() - Move to the next packet in Rx queue. + * + * @oq: Octeon Rx queue data structure. + * @buff_info: Current packet buffer info. + * @read_idx: Current packet index in the ring. + * @desc_used: Current packet descriptor number. + * + * Free the resources associated with a packet. + * Increment packet index in the ring and packet descriptor number. + */ +static void octep_oq_next_pkt(struct octep_oq *oq, + struct octep_rx_buffer *buff_info, + u32 *read_idx, u32 *desc_used) +{ + dma_unmap_page(oq->dev, oq->desc_ring[*read_idx].buffer_ptr, + PAGE_SIZE, DMA_FROM_DEVICE); + buff_info->page =3D NULL; + (*read_idx)++; + (*desc_used)++; + if (*read_idx =3D=3D oq->max_count) + *read_idx =3D 0; +} + /** * __octep_oq_process_rx() - Process hardware Rx queue and push to stack. * @@ -367,10 +391,7 @@ static int __octep_oq_process_rx(struct octep_device *= oct, desc_used =3D 0; for (pkt =3D 0; pkt < pkts_to_process; pkt++) { buff_info =3D (struct octep_rx_buffer *)&oq->buff_info[read_idx]; - dma_unmap_page(oq->dev, oq->desc_ring[read_idx].buffer_ptr, - PAGE_SIZE, DMA_FROM_DEVICE); resp_hw =3D page_address(buff_info->page); - buff_info->page =3D NULL; =20 /* Swap the length field that is in Big-Endian to CPU */ buff_info->len =3D be64_to_cpu(resp_hw->length); @@ -394,36 +415,27 @@ static int __octep_oq_process_rx(struct octep_device = *oct, data_offset =3D OCTEP_OQ_RESP_HW_SIZE; rx_ol_flags =3D 0; } + + octep_oq_next_pkt(oq, buff_info, &read_idx, &desc_used); + + skb =3D build_skb((void *)resp_hw, PAGE_SIZE); + skb_reserve(skb, data_offset); + rx_bytes +=3D buff_info->len; =20 if (buff_info->len <=3D oq->max_single_buffer_size) { - skb =3D build_skb((void *)resp_hw, PAGE_SIZE); - skb_reserve(skb, data_offset); skb_put(skb, buff_info->len); - read_idx++; - desc_used++; - if (read_idx =3D=3D oq->max_count) - read_idx =3D 0; } else { struct skb_shared_info *shinfo; u16 data_len; =20 - skb =3D build_skb((void *)resp_hw, PAGE_SIZE); - skb_reserve(skb, data_offset); /* Head fragment includes response header(s); * subsequent fragments contains only data. */ skb_put(skb, oq->max_single_buffer_size); - read_idx++; - desc_used++; - if (read_idx =3D=3D oq->max_count) - read_idx =3D 0; - shinfo =3D skb_shinfo(skb); data_len =3D buff_info->len - oq->max_single_buffer_size; while (data_len) { - dma_unmap_page(oq->dev, oq->desc_ring[read_idx].buffer_ptr, - PAGE_SIZE, DMA_FROM_DEVICE); buff_info =3D (struct octep_rx_buffer *) &oq->buff_info[read_idx]; if (data_len < oq->buffer_size) { @@ -438,11 +450,8 @@ static int __octep_oq_process_rx(struct octep_device *= oct, buff_info->page, 0, buff_info->len, buff_info->len); - buff_info->page =3D NULL; - read_idx++; - desc_used++; - if (read_idx =3D=3D oq->max_count) - read_idx =3D 0; + + octep_oq_next_pkt(oq, buff_info, &read_idx, &desc_used); } } =20 --=20 2.30.2