diff options
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/net/ethernet/ibm/ibmvnic.c | 195 | ||||
-rw-r--r-- | drivers/net/ethernet/ibm/ibmvnic.h | 3 |
2 files changed, 194 insertions, 4 deletions
diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c index 6e9e16eee5d0..4e97e762e297 100644 --- a/drivers/net/ethernet/ibm/ibmvnic.c +++ b/drivers/net/ethernet/ibm/ibmvnic.c @@ -61,6 +61,7 @@ #include <linux/proc_fs.h> #include <linux/in.h> #include <linux/ip.h> +#include <linux/ipv6.h> #include <linux/irq.h> #include <linux/kthread.h> #include <linux/seq_file.h> @@ -94,6 +95,7 @@ static int ibmvnic_reenable_crq_queue(struct ibmvnic_adapter *); static int ibmvnic_send_crq(struct ibmvnic_adapter *, union ibmvnic_crq *); static int send_subcrq(struct ibmvnic_adapter *adapter, u64 remote_handle, union sub_crq *sub_crq); +static int send_subcrq_indirect(struct ibmvnic_adapter *, u64, u64, u64); static irqreturn_t ibmvnic_interrupt_rx(int irq, void *instance); static int enable_scrq_irq(struct ibmvnic_adapter *, struct ibmvnic_sub_crq_queue *); @@ -561,10 +563,141 @@ static int ibmvnic_close(struct net_device *netdev) return 0; } +/** + * build_hdr_data - creates L2/L3/L4 header data buffer + * @hdr_field - bitfield determining needed headers + * @skb - socket buffer + * @hdr_len - array of header lengths + * @tot_len - total length of data + * + * Reads hdr_field to determine which headers are needed by firmware. + * Builds a buffer containing these headers. Saves individual header + * lengths and total buffer length to be used to build descriptors. + */ +static int build_hdr_data(u8 hdr_field, struct sk_buff *skb, + int *hdr_len, u8 *hdr_data) +{ + int len = 0; + u8 *hdr; + + hdr_len[0] = sizeof(struct ethhdr); + + if (skb->protocol == htons(ETH_P_IP)) { + hdr_len[1] = ip_hdr(skb)->ihl * 4; + if (ip_hdr(skb)->protocol == IPPROTO_TCP) + hdr_len[2] = tcp_hdrlen(skb); + else if (ip_hdr(skb)->protocol == IPPROTO_UDP) + hdr_len[2] = sizeof(struct udphdr); + } else if (skb->protocol == htons(ETH_P_IPV6)) { + hdr_len[1] = sizeof(struct ipv6hdr); + if (ipv6_hdr(skb)->nexthdr == IPPROTO_TCP) + hdr_len[2] = tcp_hdrlen(skb); + else if (ipv6_hdr(skb)->nexthdr == IPPROTO_UDP) + hdr_len[2] = sizeof(struct udphdr); + } + + memset(hdr_data, 0, 120); + if ((hdr_field >> 6) & 1) { + hdr = skb_mac_header(skb); + memcpy(hdr_data, hdr, hdr_len[0]); + len += hdr_len[0]; + } + + if ((hdr_field >> 5) & 1) { + hdr = skb_network_header(skb); + memcpy(hdr_data + len, hdr, hdr_len[1]); + len += hdr_len[1]; + } + + if ((hdr_field >> 4) & 1) { + hdr = skb_transport_header(skb); + memcpy(hdr_data + len, hdr, hdr_len[2]); + len += hdr_len[2]; + } + return len; +} + +/** + * create_hdr_descs - create header and header extension descriptors + * @hdr_field - bitfield determining needed headers + * @data - buffer containing header data + * @len - length of data buffer + * @hdr_len - array of individual header lengths + * @scrq_arr - descriptor array + * + * Creates header and, if needed, header extension descriptors and + * places them in a descriptor array, scrq_arr + */ + +static void create_hdr_descs(u8 hdr_field, u8 *hdr_data, int len, int *hdr_len, + union sub_crq *scrq_arr) +{ + union sub_crq hdr_desc; + int tmp_len = len; + u8 *data, *cur; + int tmp; + + while (tmp_len > 0) { + cur = hdr_data + len - tmp_len; + + memset(&hdr_desc, 0, sizeof(hdr_desc)); + if (cur != hdr_data) { + data = hdr_desc.hdr_ext.data; + tmp = tmp_len > 29 ? 29 : tmp_len; + hdr_desc.hdr_ext.first = IBMVNIC_CRQ_CMD; + hdr_desc.hdr_ext.type = IBMVNIC_HDR_EXT_DESC; + hdr_desc.hdr_ext.len = tmp; + } else { + data = hdr_desc.hdr.data; + tmp = tmp_len > 24 ? 24 : tmp_len; + hdr_desc.hdr.first = IBMVNIC_CRQ_CMD; + hdr_desc.hdr.type = IBMVNIC_HDR_DESC; + hdr_desc.hdr.len = tmp; + hdr_desc.hdr.l2_len = (u8)hdr_len[0]; + hdr_desc.hdr.l3_len = cpu_to_be16((u16)hdr_len[1]); + hdr_desc.hdr.l4_len = (u8)hdr_len[2]; + hdr_desc.hdr.flag = hdr_field << 1; + } + memcpy(data, cur, tmp); + tmp_len -= tmp; + *scrq_arr = hdr_desc; + scrq_arr++; + } +} + +/** + * build_hdr_descs_arr - build a header descriptor array + * @skb - socket buffer + * @num_entries - number of descriptors to be sent + * @subcrq - first TX descriptor + * @hdr_field - bit field determining which headers will be sent + * + * This function will build a TX descriptor array with applicable + * L2/L3/L4 packet header descriptors to be sent by send_subcrq_indirect. + */ + +static void build_hdr_descs_arr(struct ibmvnic_tx_buff *txbuff, + int *num_entries, u8 hdr_field) +{ + int hdr_len[3] = {0, 0, 0}; + int tot_len, len; + u8 *hdr_data = txbuff->hdr_data; + + tot_len = build_hdr_data(hdr_field, txbuff->skb, hdr_len, + txbuff->hdr_data); + len = tot_len; + len -= 24; + if (len > 0) + num_entries += len % 29 ? len / 29 + 1 : len / 29; + create_hdr_descs(hdr_field, hdr_data, tot_len, hdr_len, + txbuff->indir_arr + 1); +} + static int ibmvnic_xmit(struct sk_buff *skb, struct net_device *netdev) { struct ibmvnic_adapter *adapter = netdev_priv(netdev); int queue_num = skb_get_queue_mapping(skb); + u8 *hdrs = (u8 *)&adapter->tx_rx_desc_req; struct device *dev = &adapter->vdev->dev; struct ibmvnic_tx_buff *tx_buff = NULL; struct ibmvnic_tx_pool *tx_pool; @@ -579,6 +712,7 @@ static int ibmvnic_xmit(struct sk_buff *skb, struct net_device *netdev) unsigned long lpar_rc; union sub_crq tx_crq; unsigned int offset; + int num_entries = 1; unsigned char *dst; u64 *handle_array; int index = 0; @@ -644,11 +778,34 @@ static int ibmvnic_xmit(struct sk_buff *skb, struct net_device *netdev) tx_crq.v1.flags1 |= IBMVNIC_TX_PROT_UDP; } - if (skb->ip_summed == CHECKSUM_PARTIAL) + if (skb->ip_summed == CHECKSUM_PARTIAL) { tx_crq.v1.flags1 |= IBMVNIC_TX_CHKSUM_OFFLOAD; - - lpar_rc = send_subcrq(adapter, handle_array[0], &tx_crq); - + hdrs += 2; + } + /* determine if l2/3/4 headers are sent to firmware */ + if ((*hdrs >> 7) & 1 && + (skb->protocol == htons(ETH_P_IP) || + skb->protocol == htons(ETH_P_IPV6))) { + build_hdr_descs_arr(tx_buff, &num_entries, *hdrs); + tx_crq.v1.n_crq_elem = num_entries; + tx_buff->indir_arr[0] = tx_crq; + tx_buff->indir_dma = dma_map_single(dev, tx_buff->indir_arr, + sizeof(tx_buff->indir_arr), + DMA_TO_DEVICE); + if (dma_mapping_error(dev, tx_buff->indir_dma)) { + if (!firmware_has_feature(FW_FEATURE_CMO)) + dev_err(dev, "tx: unable to map descriptor array\n"); + tx_map_failed++; + tx_dropped++; + ret = NETDEV_TX_BUSY; + goto out; + } + lpar_rc = send_subcrq_indirect(adapter, handle_array[0], + (u64)tx_buff->indir_dma, + (u64)num_entries); + } else { + lpar_rc = send_subcrq(adapter, handle_array[0], &tx_crq); + } if (lpar_rc != H_SUCCESS) { dev_err(dev, "tx failed with code %ld\n", lpar_rc); @@ -1159,6 +1316,7 @@ static int ibmvnic_complete_tx(struct ibmvnic_adapter *adapter, union sub_crq *next; int index; int i, j; + u8 first; restart_loop: while (pending_scrq(adapter, scrq)) { @@ -1181,6 +1339,13 @@ restart_loop: txbuff->data_dma[j] = 0; txbuff->used_bounce = false; } + /* if sub_crq was sent indirectly */ + first = txbuff->indir_arr[0].generic.first; + if (first == IBMVNIC_CRQ_CMD) { + dma_unmap_single(dev, txbuff->indir_dma, + sizeof(txbuff->indir_arr), + DMA_TO_DEVICE); + } if (txbuff->last_frag) dev_kfree_skb_any(txbuff->skb); @@ -1494,6 +1659,28 @@ static int send_subcrq(struct ibmvnic_adapter *adapter, u64 remote_handle, return rc; } +static int send_subcrq_indirect(struct ibmvnic_adapter *adapter, + u64 remote_handle, u64 ioba, u64 num_entries) +{ + unsigned int ua = adapter->vdev->unit_address; + struct device *dev = &adapter->vdev->dev; + int rc; + + /* Make sure the hypervisor sees the complete request */ + mb(); + rc = plpar_hcall_norets(H_SEND_SUB_CRQ_INDIRECT, ua, + cpu_to_be64(remote_handle), + ioba, num_entries); + + if (rc) { + if (rc == H_CLOSED) + dev_warn(dev, "CRQ Queue closed\n"); + dev_err(dev, "Send (indirect) error (rc=%d)\n", rc); + } + + return rc; +} + static int ibmvnic_send_crq(struct ibmvnic_adapter *adapter, union ibmvnic_crq *crq) { diff --git a/drivers/net/ethernet/ibm/ibmvnic.h b/drivers/net/ethernet/ibm/ibmvnic.h index 1a9993cc79b5..5af8a796e523 100644 --- a/drivers/net/ethernet/ibm/ibmvnic.h +++ b/drivers/net/ethernet/ibm/ibmvnic.h @@ -879,6 +879,9 @@ struct ibmvnic_tx_buff { int pool_index; bool last_frag; bool used_bounce; + union sub_crq indir_arr[6]; + u8 hdr_data[140]; + dma_addr_t indir_dma; }; struct ibmvnic_tx_pool { |