From: Edward Cree Date: Thu, 17 Nov 2016 10:52:36 +0000 (+0000) Subject: sfc: remove Software TSO X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=46d1efd852ccbc94e8c4f8c41cfd84147a103436;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git sfc: remove Software TSO It gives no advantage over GSO now that xmit_more exists. If we find ourselves unable to handle a TSO skb (because our TXQ doesn't have a TSOv2 context and the NIC doesn't support TSOv1), hand it back to GSO. Also do that if the TSO handler fails with EINVAL for any other reason. As Falcon-architecture NICs don't support any firmware-assisted TSO, they no longer advertise TSO feature flags at all. Signed-off-by: Edward Cree Signed-off-by: David S. Miller --- diff --git a/drivers/net/ethernet/sfc/ef10.c b/drivers/net/ethernet/sfc/ef10.c index 9cbe573563d7..0f58ea8147d4 100644 --- a/drivers/net/ethernet/sfc/ef10.c +++ b/drivers/net/ethernet/sfc/ef10.c @@ -2158,6 +2158,20 @@ static int efx_ef10_tx_tso_desc(struct efx_tx_queue *tx_queue, return 0; } +static u32 efx_ef10_tso_versions(struct efx_nic *efx) +{ + struct efx_ef10_nic_data *nic_data = efx->nic_data; + u32 tso_versions = 0; + + if (nic_data->datapath_caps & + (1 << MC_CMD_GET_CAPABILITIES_OUT_TX_TSO_LBN)) + tso_versions |= BIT(1); + if (nic_data->datapath_caps2 & + (1 << MC_CMD_GET_CAPABILITIES_V2_OUT_TX_TSO_V2_LBN)) + tso_versions |= BIT(2); + return tso_versions; +} + static void efx_ef10_tx_init(struct efx_tx_queue *tx_queue) { MCDI_DECLARE_BUF(inbuf, MC_CMD_INIT_TXQ_IN_LEN(EFX_MAX_DMAQ_SIZE * 8 / @@ -5759,6 +5773,7 @@ const struct efx_nic_type efx_hunt_a0_nic_type = { #endif .get_mac_address = efx_ef10_get_mac_address_pf, .set_mac_address = efx_ef10_set_mac_address, + .tso_versions = efx_ef10_tso_versions, .revision = EFX_REV_HUNT_A0, .max_dma_mask = DMA_BIT_MASK(ESF_DZ_TX_KER_BUF_ADDR_WIDTH), diff --git a/drivers/net/ethernet/sfc/efx.c b/drivers/net/ethernet/sfc/efx.c index 52ca0404c491..756a09640550 100644 --- a/drivers/net/ethernet/sfc/efx.c +++ b/drivers/net/ethernet/sfc/efx.c @@ -3200,23 +3200,6 @@ static int efx_pci_probe(struct pci_dev *pci_dev, efx = netdev_priv(net_dev); efx->type = (const struct efx_nic_type *) entry->driver_data; efx->fixed_features |= NETIF_F_HIGHDMA; - net_dev->features |= (efx->type->offload_features | NETIF_F_SG | - NETIF_F_TSO | NETIF_F_RXCSUM); - if (efx->type->offload_features & (NETIF_F_IPV6_CSUM | NETIF_F_HW_CSUM)) - net_dev->features |= NETIF_F_TSO6; - /* Mask for features that also apply to VLAN devices */ - net_dev->vlan_features |= (NETIF_F_HW_CSUM | NETIF_F_SG | - NETIF_F_HIGHDMA | NETIF_F_ALL_TSO | - NETIF_F_RXCSUM); - - net_dev->hw_features = net_dev->features & ~efx->fixed_features; - - /* Disable VLAN filtering by default. It may be enforced if - * the feature is fixed (i.e. VLAN filters are required to - * receive VLAN tagged packets due to vPort restrictions). - */ - net_dev->features &= ~NETIF_F_HW_VLAN_CTAG_FILTER; - net_dev->features |= efx->fixed_features; pci_set_drvdata(pci_dev, efx); SET_NETDEV_DEV(net_dev, &pci_dev->dev); @@ -3239,6 +3222,27 @@ static int efx_pci_probe(struct pci_dev *pci_dev, if (rc) goto fail3; + net_dev->features |= (efx->type->offload_features | NETIF_F_SG | + NETIF_F_TSO | NETIF_F_RXCSUM); + if (efx->type->offload_features & (NETIF_F_IPV6_CSUM | NETIF_F_HW_CSUM)) + net_dev->features |= NETIF_F_TSO6; + /* Check whether device supports TSO */ + if (!efx->type->tso_versions || !efx->type->tso_versions(efx)) + net_dev->features &= ~NETIF_F_ALL_TSO; + /* Mask for features that also apply to VLAN devices */ + net_dev->vlan_features |= (NETIF_F_HW_CSUM | NETIF_F_SG | + NETIF_F_HIGHDMA | NETIF_F_ALL_TSO | + NETIF_F_RXCSUM); + + net_dev->hw_features = net_dev->features & ~efx->fixed_features; + + /* Disable VLAN filtering by default. It may be enforced if + * the feature is fixed (i.e. VLAN filters are required to + * receive VLAN tagged packets due to vPort restrictions). + */ + net_dev->features &= ~NETIF_F_HW_VLAN_CTAG_FILTER; + net_dev->features |= efx->fixed_features; + rc = efx_register_netdev(efx); if (rc) goto fail4; diff --git a/drivers/net/ethernet/sfc/ethtool.c b/drivers/net/ethernet/sfc/ethtool.c index bd5edd61bf64..740cdf08fa19 100644 --- a/drivers/net/ethernet/sfc/ethtool.c +++ b/drivers/net/ethernet/sfc/ethtool.c @@ -69,6 +69,7 @@ static const struct efx_sw_stat_desc efx_sw_stat_desc[] = { EFX_ETHTOOL_UINT_TXQ_STAT(tso_bursts), EFX_ETHTOOL_UINT_TXQ_STAT(tso_long_headers), EFX_ETHTOOL_UINT_TXQ_STAT(tso_packets), + EFX_ETHTOOL_UINT_TXQ_STAT(tso_fallbacks), EFX_ETHTOOL_UINT_TXQ_STAT(pushes), EFX_ETHTOOL_UINT_TXQ_STAT(pio_packets), EFX_ETHTOOL_UINT_TXQ_STAT(cb_packets), diff --git a/drivers/net/ethernet/sfc/net_driver.h b/drivers/net/ethernet/sfc/net_driver.h index 2da3e8fb6d71..f97f828a0898 100644 --- a/drivers/net/ethernet/sfc/net_driver.h +++ b/drivers/net/ethernet/sfc/net_driver.h @@ -225,6 +225,7 @@ struct efx_tx_buffer { * @tso_long_headers: Number of packets with headers too long for standard * blocks * @tso_packets: Number of packets via the TSO xmit path + * @tso_fallbacks: Number of times TSO fallback used * @pushes: Number of times the TX push feature has been used * @pio_packets: Number of times the TX PIO feature has been used * @xmit_more_available: Are any packets waiting to be pushed to the NIC @@ -266,6 +267,7 @@ struct efx_tx_queue { unsigned int tso_bursts; unsigned int tso_long_headers; unsigned int tso_packets; + unsigned int tso_fallbacks; unsigned int pushes; unsigned int pio_packets; bool xmit_more_available; @@ -1225,6 +1227,8 @@ struct efx_mtd_partition { * and tx_type will already have been validated but this operation * must validate and update rx_filter. * @set_mac_address: Set the MAC address of the device + * @tso_versions: Returns mask of firmware-assisted TSO versions supported. + * If %NULL, then device does not support any TSO version. * @revision: Hardware architecture revision * @txd_ptr_tbl_base: TX descriptor ring base address * @rxd_ptr_tbl_base: RX descriptor ring base address @@ -1381,6 +1385,7 @@ struct efx_nic_type { void (*vswitching_remove)(struct efx_nic *efx); int (*get_mac_address)(struct efx_nic *efx, unsigned char *perm_addr); int (*set_mac_address)(struct efx_nic *efx); + u32 (*tso_versions)(struct efx_nic *efx); int revision; unsigned int txd_ptr_tbl_base; diff --git a/drivers/net/ethernet/sfc/tx.c b/drivers/net/ethernet/sfc/tx.c index 3089e888a08d..1aa728cfa8ba 100644 --- a/drivers/net/ethernet/sfc/tx.c +++ b/drivers/net/ethernet/sfc/tx.c @@ -446,10 +446,38 @@ static void efx_enqueue_unwind(struct efx_tx_queue *tx_queue) } } -static int efx_tx_tso_sw(struct efx_tx_queue *tx_queue, struct sk_buff *skb, - bool *data_mapped) +/* + * Fallback to software TSO. + * + * This is used if we are unable to send a GSO packet through hardware TSO. + * This should only ever happen due to per-queue restrictions - unsupported + * packets should first be filtered by the feature flags. + * + * Returns 0 on success, error code otherwise. + */ +static int efx_tx_tso_fallback(struct efx_tx_queue *tx_queue, + struct sk_buff *skb) { - return efx_enqueue_skb_tso(tx_queue, skb, data_mapped); + struct sk_buff *segments, *next; + + segments = skb_gso_segment(skb, 0); + if (IS_ERR(segments)) + return PTR_ERR(segments); + + dev_kfree_skb_any(skb); + skb = segments; + + while (skb) { + next = skb->next; + skb->next = NULL; + + if (next) + skb->xmit_more = true; + efx_enqueue_skb(tx_queue, skb); + skb = next; + } + + return 0; } /* @@ -473,6 +501,7 @@ netdev_tx_t efx_enqueue_skb(struct efx_tx_queue *tx_queue, struct sk_buff *skb) bool data_mapped = false; unsigned int segments; unsigned int skb_len; + int rc; skb_len = skb->len; segments = skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 0; @@ -485,7 +514,14 @@ netdev_tx_t efx_enqueue_skb(struct efx_tx_queue *tx_queue, struct sk_buff *skb) */ if (segments) { EFX_BUG_ON_PARANOID(!tx_queue->handle_tso); - if (tx_queue->handle_tso(tx_queue, skb, &data_mapped)) + rc = tx_queue->handle_tso(tx_queue, skb, &data_mapped); + if (rc == -EINVAL) { + rc = efx_tx_tso_fallback(tx_queue, skb); + tx_queue->tso_fallbacks++; + if (rc == 0) + return 0; + } + if (rc) goto err; #ifdef EFX_USE_PIO } else if (skb_len <= efx_piobuf_size && !skb->xmit_more && @@ -801,7 +837,7 @@ void efx_init_tx_queue(struct efx_tx_queue *tx_queue) /* Set up default function pointers. These may get replaced by * efx_nic_init_tx() based off NIC/queue capabilities. */ - tx_queue->handle_tso = efx_tx_tso_sw; + tx_queue->handle_tso = efx_enqueue_skb_tso; /* Some older hardware requires Tx writes larger than 32. */ tx_queue->tx_min_size = EFX_WORKAROUND_15592(efx) ? 33 : 0; diff --git a/drivers/net/ethernet/sfc/tx_tso.c b/drivers/net/ethernet/sfc/tx_tso.c index 99936d70ed71..60328870aad7 100644 --- a/drivers/net/ethernet/sfc/tx_tso.c +++ b/drivers/net/ethernet/sfc/tx_tso.c @@ -29,8 +29,7 @@ /* Efx legacy TCP segmentation acceleration. * - * Why? Because by doing it here in the driver we can go significantly - * faster than the GSO. + * Utilises firmware support to go faster than GSO (but not as fast as TSOv2). * * Requires TX checksum offload support. */ @@ -47,15 +46,13 @@ * @in_len: Remaining length in current SKB fragment * @unmap_len: Length of SKB fragment * @unmap_addr: DMA address of SKB fragment - * @dma_flags: TX buffer flags for DMA mapping - %EFX_TX_BUF_MAP_SINGLE or 0 * @protocol: Network protocol (after any VLAN header) * @ip_off: Offset of IP header * @tcp_off: Offset of TCP header * @header_len: Number of bytes of header * @ip_base_len: IPv4 tot_len or IPv6 payload_len, before TCP payload - * @header_dma_addr: Header DMA address, when using option descriptors - * @header_unmap_len: Header DMA mapped length, or 0 if not using option - * descriptors + * @header_dma_addr: Header DMA address + * @header_unmap_len: Header DMA mapped length * * The state used during segmentation. It is put into this data structure * just to make it easy to pass into inline functions. @@ -72,7 +69,6 @@ struct tso_state { unsigned int in_len; unsigned int unmap_len; dma_addr_t unmap_addr; - unsigned short dma_flags; __be16 protocol; unsigned int ip_off; @@ -172,63 +168,6 @@ static __be16 efx_tso_check_protocol(struct sk_buff *skb) return protocol; } -static u8 *efx_tsoh_get_buffer(struct efx_tx_queue *tx_queue, - struct efx_tx_buffer *buffer, unsigned int len) -{ - u8 *result; - - EFX_BUG_ON_PARANOID(buffer->len); - EFX_BUG_ON_PARANOID(buffer->flags); - EFX_BUG_ON_PARANOID(buffer->unmap_len); - - result = efx_tx_get_copy_buffer_limited(tx_queue, buffer, len); - - if (result) { - buffer->flags = EFX_TX_BUF_CONT; - } else { - buffer->heap_buf = kmalloc(NET_IP_ALIGN + len, GFP_ATOMIC); - if (unlikely(!buffer->heap_buf)) - return NULL; - tx_queue->tso_long_headers++; - result = (u8 *)buffer->heap_buf + NET_IP_ALIGN; - buffer->flags = EFX_TX_BUF_CONT | EFX_TX_BUF_HEAP; - } - - buffer->len = len; - - return result; -} - -/* - * Put a TSO header into the TX queue. - * - * This is special-cased because we know that it is small enough to fit in - * a single fragment, and we know it doesn't cross a page boundary. It - * also allows us to not worry about end-of-packet etc. - */ -static int efx_tso_put_header(struct efx_tx_queue *tx_queue, - struct efx_tx_buffer *buffer, u8 *header) -{ - if (unlikely(buffer->flags & EFX_TX_BUF_HEAP)) { - buffer->dma_addr = dma_map_single(&tx_queue->efx->pci_dev->dev, - header, buffer->len, - DMA_TO_DEVICE); - if (unlikely(dma_mapping_error(&tx_queue->efx->pci_dev->dev, - buffer->dma_addr))) { - kfree(buffer->heap_buf); - buffer->len = 0; - buffer->flags = 0; - return -ENOMEM; - } - buffer->unmap_len = buffer->len; - buffer->dma_offset = 0; - buffer->flags |= EFX_TX_BUF_MAP_SINGLE; - } - - ++tx_queue->insert_count; - return 0; -} - /* Parse the SKB header and initialise state. */ static int tso_start(struct tso_state *st, struct efx_nic *efx, @@ -237,12 +176,8 @@ static int tso_start(struct tso_state *st, struct efx_nic *efx, { struct device *dma_dev = &efx->pci_dev->dev; unsigned int header_len, in_len; - bool use_opt_desc = false; dma_addr_t dma_addr; - if (tx_queue->tso_version == 1) - use_opt_desc = true; - st->ip_off = skb_network_header(skb) - skb->data; st->tcp_off = skb_transport_header(skb) - skb->data; header_len = st->tcp_off + (tcp_hdr(skb)->doff << 2u); @@ -264,30 +199,12 @@ static int tso_start(struct tso_state *st, struct efx_nic *efx, st->out_len = skb->len - header_len; - if (!use_opt_desc) { - st->header_unmap_len = 0; - - if (likely(in_len == 0)) { - st->dma_flags = 0; - st->unmap_len = 0; - return 0; - } - - dma_addr = dma_map_single(dma_dev, skb->data + header_len, - in_len, DMA_TO_DEVICE); - st->dma_flags = EFX_TX_BUF_MAP_SINGLE; - st->dma_addr = dma_addr; - st->unmap_addr = dma_addr; - st->unmap_len = in_len; - } else { - dma_addr = dma_map_single(dma_dev, skb->data, - skb_headlen(skb), DMA_TO_DEVICE); - st->header_dma_addr = dma_addr; - st->header_unmap_len = skb_headlen(skb); - st->dma_flags = 0; - st->dma_addr = dma_addr + header_len; - st->unmap_len = 0; - } + dma_addr = dma_map_single(dma_dev, skb->data, + skb_headlen(skb), DMA_TO_DEVICE); + st->header_dma_addr = dma_addr; + st->header_unmap_len = skb_headlen(skb); + st->dma_addr = dma_addr + header_len; + st->unmap_len = 0; return unlikely(dma_mapping_error(dma_dev, dma_addr)) ? -ENOMEM : 0; } @@ -298,7 +215,6 @@ static int tso_get_fragment(struct tso_state *st, struct efx_nic *efx, st->unmap_addr = skb_frag_dma_map(&efx->pci_dev->dev, frag, 0, skb_frag_size(frag), DMA_TO_DEVICE); if (likely(!dma_mapping_error(&efx->pci_dev->dev, st->unmap_addr))) { - st->dma_flags = 0; st->unmap_len = skb_frag_size(frag); st->in_len = skb_frag_size(frag); st->dma_addr = st->unmap_addr; @@ -352,7 +268,6 @@ static void tso_fill_packet_with_fragment(struct efx_tx_queue *tx_queue, /* Transfer ownership of the DMA mapping */ buffer->unmap_len = st->unmap_len; buffer->dma_offset = buffer->unmap_len - buffer->len; - buffer->flags |= st->dma_flags; st->unmap_len = 0; } @@ -369,7 +284,7 @@ static void tso_fill_packet_with_fragment(struct efx_tx_queue *tx_queue, * @st: TSO state * * Generate a new header and prepare for the new packet. Return 0 on - * success, or -%ENOMEM if failed to alloc header. + * success, or -%ENOMEM if failed to alloc header, or other negative error. */ static int tso_start_new_packet(struct efx_tx_queue *tx_queue, const struct sk_buff *skb, @@ -378,7 +293,7 @@ static int tso_start_new_packet(struct efx_tx_queue *tx_queue, struct efx_tx_buffer *buffer = efx_tx_queue_get_insert_buffer(tx_queue); bool is_last = st->out_len <= skb_shinfo(skb)->gso_size; - u8 tcp_flags_mask; + u8 tcp_flags_mask, tcp_flags; if (!is_last) { st->packet_space = skb_shinfo(skb)->gso_size; @@ -388,82 +303,44 @@ static int tso_start_new_packet(struct efx_tx_queue *tx_queue, tcp_flags_mask = 0x00; } - if (!st->header_unmap_len) { - /* Allocate and insert a DMA-mapped header buffer. */ - struct tcphdr *tsoh_th; - unsigned int ip_length; - u8 *header; - int rc; - - header = efx_tsoh_get_buffer(tx_queue, buffer, st->header_len); - if (!header) - return -ENOMEM; - - tsoh_th = (struct tcphdr *)(header + st->tcp_off); - - /* Copy and update the headers. */ - memcpy(header, skb->data, st->header_len); - - tsoh_th->seq = htonl(st->seqnum); - ((u8 *)tsoh_th)[TCP_FLAGS_OFFSET] &= ~tcp_flags_mask; - - ip_length = st->ip_base_len + st->packet_space; - - if (st->protocol == htons(ETH_P_IP)) { - struct iphdr *tsoh_iph = - (struct iphdr *)(header + st->ip_off); - - tsoh_iph->tot_len = htons(ip_length); - tsoh_iph->id = htons(st->ipv4_id); - } else { - struct ipv6hdr *tsoh_iph = - (struct ipv6hdr *)(header + st->ip_off); - - tsoh_iph->payload_len = htons(ip_length); - } + if (WARN_ON(!st->header_unmap_len)) + return -EINVAL; + /* Send the original headers with a TSO option descriptor + * in front + */ + tcp_flags = ((u8 *)tcp_hdr(skb))[TCP_FLAGS_OFFSET] & ~tcp_flags_mask; + + buffer->flags = EFX_TX_BUF_OPTION; + buffer->len = 0; + buffer->unmap_len = 0; + EFX_POPULATE_QWORD_5(buffer->option, + ESF_DZ_TX_DESC_IS_OPT, 1, + ESF_DZ_TX_OPTION_TYPE, + ESE_DZ_TX_OPTION_DESC_TSO, + ESF_DZ_TX_TSO_TCP_FLAGS, tcp_flags, + ESF_DZ_TX_TSO_IP_ID, st->ipv4_id, + ESF_DZ_TX_TSO_TCP_SEQNO, st->seqnum); + ++tx_queue->insert_count; - rc = efx_tso_put_header(tx_queue, buffer, header); - if (unlikely(rc)) - return rc; - } else { - /* Send the original headers with a TSO option descriptor - * in front + /* We mapped the headers in tso_start(). Unmap them + * when the last segment is completed. + */ + buffer = efx_tx_queue_get_insert_buffer(tx_queue); + buffer->dma_addr = st->header_dma_addr; + buffer->len = st->header_len; + if (is_last) { + buffer->flags = EFX_TX_BUF_CONT | EFX_TX_BUF_MAP_SINGLE; + buffer->unmap_len = st->header_unmap_len; + buffer->dma_offset = 0; + /* Ensure we only unmap them once in case of a + * later DMA mapping error and rollback */ - u8 tcp_flags = ((u8 *)tcp_hdr(skb))[TCP_FLAGS_OFFSET] & - ~tcp_flags_mask; - - buffer->flags = EFX_TX_BUF_OPTION; - buffer->len = 0; + st->header_unmap_len = 0; + } else { + buffer->flags = EFX_TX_BUF_CONT; buffer->unmap_len = 0; - EFX_POPULATE_QWORD_5(buffer->option, - ESF_DZ_TX_DESC_IS_OPT, 1, - ESF_DZ_TX_OPTION_TYPE, - ESE_DZ_TX_OPTION_DESC_TSO, - ESF_DZ_TX_TSO_TCP_FLAGS, tcp_flags, - ESF_DZ_TX_TSO_IP_ID, st->ipv4_id, - ESF_DZ_TX_TSO_TCP_SEQNO, st->seqnum); - ++tx_queue->insert_count; - - /* We mapped the headers in tso_start(). Unmap them - * when the last segment is completed. - */ - buffer = efx_tx_queue_get_insert_buffer(tx_queue); - buffer->dma_addr = st->header_dma_addr; - buffer->len = st->header_len; - if (is_last) { - buffer->flags = EFX_TX_BUF_CONT | EFX_TX_BUF_MAP_SINGLE; - buffer->unmap_len = st->header_unmap_len; - buffer->dma_offset = 0; - /* Ensure we only unmap them once in case of a - * later DMA mapping error and rollback - */ - st->header_unmap_len = 0; - } else { - buffer->flags = EFX_TX_BUF_CONT; - buffer->unmap_len = 0; - } - ++tx_queue->insert_count; } + ++tx_queue->insert_count; st->seqnum += skb_shinfo(skb)->gso_size; @@ -483,8 +360,8 @@ static int tso_start_new_packet(struct efx_tx_queue *tx_queue, * Context: You must hold netif_tx_lock() to call this function. * * Add socket buffer @skb to @tx_queue, doing TSO or return != 0 if - * @skb was not enqueued. In all cases @skb is consumed. Return - * %NETDEV_TX_OK. + * @skb was not enqueued. @skb is consumed unless return value is + * %EINVAL. */ int efx_enqueue_skb_tso(struct efx_tx_queue *tx_queue, struct sk_buff *skb, @@ -494,6 +371,9 @@ int efx_enqueue_skb_tso(struct efx_tx_queue *tx_queue, int frag_i, rc; struct tso_state state; + if (tx_queue->tso_version != 1) + return -EINVAL; + prefetch(skb->data); /* Find the packet protocol and sanity-check it */ @@ -503,7 +383,7 @@ int efx_enqueue_skb_tso(struct efx_tx_queue *tx_queue, rc = tso_start(&state, efx, tx_queue, skb); if (rc) - goto mem_err; + goto fail; if (likely(state.in_len == 0)) { /* Grab the first payload fragment. */ @@ -512,14 +392,15 @@ int efx_enqueue_skb_tso(struct efx_tx_queue *tx_queue, rc = tso_get_fragment(&state, efx, skb_shinfo(skb)->frags + frag_i); if (rc) - goto mem_err; + goto fail; } else { /* Payload starts in the header area. */ frag_i = -1; } - if (tso_start_new_packet(tx_queue, skb, &state) < 0) - goto mem_err; + rc = tso_start_new_packet(tx_queue, skb, &state); + if (rc) + goto fail; prefetch_ptr(tx_queue); @@ -534,37 +415,38 @@ int efx_enqueue_skb_tso(struct efx_tx_queue *tx_queue, rc = tso_get_fragment(&state, efx, skb_shinfo(skb)->frags + frag_i); if (rc) - goto mem_err; + goto fail; } /* Start at new packet? */ - if (state.packet_space == 0 && - tso_start_new_packet(tx_queue, skb, &state) < 0) - goto mem_err; + if (state.packet_space == 0) { + rc = tso_start_new_packet(tx_queue, skb, &state); + if (rc) + goto fail; + } } *data_mapped = true; return 0; - mem_err: - netif_err(efx, tx_err, efx->net_dev, - "Out of memory for TSO headers, or DMA mapping error\n"); +fail: + if (rc == -ENOMEM) + netif_err(efx, tx_err, efx->net_dev, + "Out of memory for TSO headers, or DMA mapping error\n"); + else + netif_err(efx, tx_err, efx->net_dev, "TSO failed, rc = %d\n", rc); /* Free the DMA mapping we were in the process of writing out */ if (state.unmap_len) { - if (state.dma_flags & EFX_TX_BUF_MAP_SINGLE) - dma_unmap_single(&efx->pci_dev->dev, state.unmap_addr, - state.unmap_len, DMA_TO_DEVICE); - else - dma_unmap_page(&efx->pci_dev->dev, state.unmap_addr, - state.unmap_len, DMA_TO_DEVICE); + dma_unmap_page(&efx->pci_dev->dev, state.unmap_addr, + state.unmap_len, DMA_TO_DEVICE); } - /* Free the header DMA mapping, if using option descriptors */ + /* Free the header DMA mapping */ if (state.header_unmap_len) dma_unmap_single(&efx->pci_dev->dev, state.header_dma_addr, state.header_unmap_len, DMA_TO_DEVICE); - return -ENOMEM; + return rc; }