Commit 55482edc authored by Manish Chopra's avatar Manish Chopra Committed by David S. Miller

qede: Add slowpath/fastpath support and enable hardware GRO

This patch configures hardware to use GRO and adds support
for fastpath APIs to handle HW aggregated packets.
Signed-off-by: default avatarYuval Mintz <Yuval.Mintz@qlogic.com>
Signed-off-by: default avatarManish Chopra <manish.chopra@qlogic.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 088c8618
......@@ -160,6 +160,7 @@ struct qede_dev {
u16 q_num_rx_buffers; /* Must be a power of two */
u16 q_num_tx_buffers; /* Must be a power of two */
bool gro_disable;
struct list_head vlan_list;
u16 configured_vlans;
u16 non_configured_vlans;
......@@ -188,6 +189,24 @@ struct sw_rx_data {
unsigned int page_offset;
};
enum qede_agg_state {
QEDE_AGG_STATE_NONE = 0,
QEDE_AGG_STATE_START = 1,
QEDE_AGG_STATE_ERROR = 2
};
struct qede_agg_info {
struct sw_rx_data replace_buf;
dma_addr_t replace_buf_mapping;
struct sw_rx_data start_buf;
dma_addr_t start_buf_mapping;
struct eth_fast_path_rx_tpa_start_cqe start_cqe;
enum qede_agg_state agg_state;
struct sk_buff *skb;
int frag_id;
u16 vlan_tag;
};
struct qede_rx_queue {
__le16 *hw_cons_ptr;
struct sw_rx_data *sw_rx_ring;
......@@ -197,6 +216,9 @@ struct qede_rx_queue {
struct qed_chain rx_comp_ring;
void __iomem *hw_rxq_prod_addr;
/* GRO */
struct qede_agg_info tpa_info[ETH_TPA_MAX_AGGS_NUM];
int rx_buf_size;
unsigned int rx_buf_seg_size;
......
......@@ -866,6 +866,278 @@ static inline void qede_skb_receive(struct qede_dev *edev,
napi_gro_receive(&fp->napi, skb);
}
static void qede_set_gro_params(struct qede_dev *edev,
struct sk_buff *skb,
struct eth_fast_path_rx_tpa_start_cqe *cqe)
{
u16 parsing_flags = le16_to_cpu(cqe->pars_flags.flags);
if (((parsing_flags >> PARSING_AND_ERR_FLAGS_L3TYPE_SHIFT) &
PARSING_AND_ERR_FLAGS_L3TYPE_MASK) == 2)
skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
else
skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
skb_shinfo(skb)->gso_size = __le16_to_cpu(cqe->len_on_first_bd) -
cqe->header_len;
}
static int qede_fill_frag_skb(struct qede_dev *edev,
struct qede_rx_queue *rxq,
u8 tpa_agg_index,
u16 len_on_bd)
{
struct sw_rx_data *current_bd = &rxq->sw_rx_ring[rxq->sw_rx_cons &
NUM_RX_BDS_MAX];
struct qede_agg_info *tpa_info = &rxq->tpa_info[tpa_agg_index];
struct sk_buff *skb = tpa_info->skb;
if (unlikely(tpa_info->agg_state != QEDE_AGG_STATE_START))
goto out;
/* Add one frag and update the appropriate fields in the skb */
skb_fill_page_desc(skb, tpa_info->frag_id++,
current_bd->data, current_bd->page_offset,
len_on_bd);
if (unlikely(qede_realloc_rx_buffer(edev, rxq, current_bd))) {
tpa_info->agg_state = QEDE_AGG_STATE_ERROR;
goto out;
}
qed_chain_consume(&rxq->rx_bd_ring);
rxq->sw_rx_cons++;
skb->data_len += len_on_bd;
skb->truesize += rxq->rx_buf_seg_size;
skb->len += len_on_bd;
return 0;
out:
return -ENOMEM;
}
static void qede_tpa_start(struct qede_dev *edev,
struct qede_rx_queue *rxq,
struct eth_fast_path_rx_tpa_start_cqe *cqe)
{
struct qede_agg_info *tpa_info = &rxq->tpa_info[cqe->tpa_agg_index];
struct eth_rx_bd *rx_bd_cons = qed_chain_consume(&rxq->rx_bd_ring);
struct eth_rx_bd *rx_bd_prod = qed_chain_produce(&rxq->rx_bd_ring);
struct sw_rx_data *replace_buf = &tpa_info->replace_buf;
dma_addr_t mapping = tpa_info->replace_buf_mapping;
struct sw_rx_data *sw_rx_data_cons;
struct sw_rx_data *sw_rx_data_prod;
enum pkt_hash_types rxhash_type;
u32 rxhash;
sw_rx_data_cons = &rxq->sw_rx_ring[rxq->sw_rx_cons & NUM_RX_BDS_MAX];
sw_rx_data_prod = &rxq->sw_rx_ring[rxq->sw_rx_prod & NUM_RX_BDS_MAX];
/* Use pre-allocated replacement buffer - we can't release the agg.
* start until its over and we don't want to risk allocation failing
* here, so re-allocate when aggregation will be over.
*/
dma_unmap_addr_set(sw_rx_data_prod, mapping,
dma_unmap_addr(replace_buf, mapping));
sw_rx_data_prod->data = replace_buf->data;
rx_bd_prod->addr.hi = cpu_to_le32(upper_32_bits(mapping));
rx_bd_prod->addr.lo = cpu_to_le32(lower_32_bits(mapping));
sw_rx_data_prod->page_offset = replace_buf->page_offset;
rxq->sw_rx_prod++;
/* move partial skb from cons to pool (don't unmap yet)
* save mapping, incase we drop the packet later on.
*/
tpa_info->start_buf = *sw_rx_data_cons;
mapping = HILO_U64(le32_to_cpu(rx_bd_cons->addr.hi),
le32_to_cpu(rx_bd_cons->addr.lo));
tpa_info->start_buf_mapping = mapping;
rxq->sw_rx_cons++;
/* set tpa state to start only if we are able to allocate skb
* for this aggregation, otherwise mark as error and aggregation will
* be dropped
*/
tpa_info->skb = netdev_alloc_skb(edev->ndev,
le16_to_cpu(cqe->len_on_first_bd));
if (unlikely(!tpa_info->skb)) {
tpa_info->agg_state = QEDE_AGG_STATE_ERROR;
return;
}
skb_put(tpa_info->skb, le16_to_cpu(cqe->len_on_first_bd));
memcpy(&tpa_info->start_cqe, cqe, sizeof(tpa_info->start_cqe));
/* Start filling in the aggregation info */
tpa_info->frag_id = 0;
tpa_info->agg_state = QEDE_AGG_STATE_START;
rxhash = qede_get_rxhash(edev, cqe->bitfields,
cqe->rss_hash, &rxhash_type);
skb_set_hash(tpa_info->skb, rxhash, rxhash_type);
if ((le16_to_cpu(cqe->pars_flags.flags) >>
PARSING_AND_ERR_FLAGS_TAG8021QEXIST_SHIFT) &
PARSING_AND_ERR_FLAGS_TAG8021QEXIST_MASK)
tpa_info->vlan_tag = le16_to_cpu(cqe->vlan_tag);
else
tpa_info->vlan_tag = 0;
/* This is needed in order to enable forwarding support */
qede_set_gro_params(edev, tpa_info->skb, cqe);
if (likely(cqe->ext_bd_len_list[0]))
qede_fill_frag_skb(edev, rxq, cqe->tpa_agg_index,
le16_to_cpu(cqe->ext_bd_len_list[0]));
if (unlikely(cqe->ext_bd_len_list[1])) {
DP_ERR(edev,
"Unlikely - got a TPA aggregation with more than one ext_bd_len_list entry in the TPA start\n");
tpa_info->agg_state = QEDE_AGG_STATE_ERROR;
}
}
static void qede_gro_ip_csum(struct sk_buff *skb)
{
const struct iphdr *iph = ip_hdr(skb);
struct tcphdr *th;
skb_set_network_header(skb, 0);
skb_set_transport_header(skb, sizeof(struct iphdr));
th = tcp_hdr(skb);
th->check = ~tcp_v4_check(skb->len - skb_transport_offset(skb),
iph->saddr, iph->daddr, 0);
tcp_gro_complete(skb);
}
static void qede_gro_ipv6_csum(struct sk_buff *skb)
{
struct ipv6hdr *iph = ipv6_hdr(skb);
struct tcphdr *th;
skb_set_network_header(skb, 0);
skb_set_transport_header(skb, sizeof(struct ipv6hdr));
th = tcp_hdr(skb);
th->check = ~tcp_v6_check(skb->len - skb_transport_offset(skb),
&iph->saddr, &iph->daddr, 0);
tcp_gro_complete(skb);
}
static void qede_gro_receive(struct qede_dev *edev,
struct qede_fastpath *fp,
struct sk_buff *skb,
u16 vlan_tag)
{
if (skb_shinfo(skb)->gso_size) {
switch (skb->protocol) {
case htons(ETH_P_IP):
qede_gro_ip_csum(skb);
break;
case htons(ETH_P_IPV6):
qede_gro_ipv6_csum(skb);
break;
default:
DP_ERR(edev,
"Error: FW GRO supports only IPv4/IPv6, not 0x%04x\n",
ntohs(skb->protocol));
}
}
skb_record_rx_queue(skb, fp->rss_id);
qede_skb_receive(edev, fp, skb, vlan_tag);
}
static inline void qede_tpa_cont(struct qede_dev *edev,
struct qede_rx_queue *rxq,
struct eth_fast_path_rx_tpa_cont_cqe *cqe)
{
int i;
for (i = 0; cqe->len_list[i]; i++)
qede_fill_frag_skb(edev, rxq, cqe->tpa_agg_index,
le16_to_cpu(cqe->len_list[i]));
if (unlikely(i > 1))
DP_ERR(edev,
"Strange - TPA cont with more than a single len_list entry\n");
}
static void qede_tpa_end(struct qede_dev *edev,
struct qede_fastpath *fp,
struct eth_fast_path_rx_tpa_end_cqe *cqe)
{
struct qede_rx_queue *rxq = fp->rxq;
struct qede_agg_info *tpa_info;
struct sk_buff *skb;
int i;
tpa_info = &rxq->tpa_info[cqe->tpa_agg_index];
skb = tpa_info->skb;
for (i = 0; cqe->len_list[i]; i++)
qede_fill_frag_skb(edev, rxq, cqe->tpa_agg_index,
le16_to_cpu(cqe->len_list[i]));
if (unlikely(i > 1))
DP_ERR(edev,
"Strange - TPA emd with more than a single len_list entry\n");
if (unlikely(tpa_info->agg_state != QEDE_AGG_STATE_START))
goto err;
/* Sanity */
if (unlikely(cqe->num_of_bds != tpa_info->frag_id + 1))
DP_ERR(edev,
"Strange - TPA had %02x BDs, but SKB has only %d frags\n",
cqe->num_of_bds, tpa_info->frag_id);
if (unlikely(skb->len != le16_to_cpu(cqe->total_packet_len)))
DP_ERR(edev,
"Strange - total packet len [cqe] is %4x but SKB has len %04x\n",
le16_to_cpu(cqe->total_packet_len), skb->len);
memcpy(skb->data,
page_address(tpa_info->start_buf.data) +
tpa_info->start_cqe.placement_offset +
tpa_info->start_buf.page_offset,
le16_to_cpu(tpa_info->start_cqe.len_on_first_bd));
/* Recycle [mapped] start buffer for the next replacement */
tpa_info->replace_buf = tpa_info->start_buf;
tpa_info->replace_buf_mapping = tpa_info->start_buf_mapping;
/* Finalize the SKB */
skb->protocol = eth_type_trans(skb, edev->ndev);
skb->ip_summed = CHECKSUM_UNNECESSARY;
/* tcp_gro_complete() will copy NAPI_GRO_CB(skb)->count
* to skb_shinfo(skb)->gso_segs
*/
NAPI_GRO_CB(skb)->count = le16_to_cpu(cqe->num_of_coalesced_segs);
qede_gro_receive(edev, fp, skb, tpa_info->vlan_tag);
tpa_info->agg_state = QEDE_AGG_STATE_NONE;
return;
err:
/* The BD starting the aggregation is still mapped; Re-use it for
* future aggregations [as replacement buffer]
*/
memcpy(&tpa_info->replace_buf, &tpa_info->start_buf,
sizeof(struct sw_rx_data));
tpa_info->replace_buf_mapping = tpa_info->start_buf_mapping;
tpa_info->start_buf.data = NULL;
tpa_info->agg_state = QEDE_AGG_STATE_NONE;
dev_kfree_skb_any(tpa_info->skb);
tpa_info->skb = NULL;
}
static u8 qede_check_csum(u16 flag)
{
u16 csum_flag = 0;
......@@ -931,6 +1203,25 @@ static int qede_rx_int(struct qede_fastpath *fp, int budget)
goto next_cqe;
}
if (cqe_type != ETH_RX_CQE_TYPE_REGULAR) {
switch (cqe_type) {
case ETH_RX_CQE_TYPE_TPA_START:
qede_tpa_start(edev, rxq,
&cqe->fast_path_tpa_start);
goto next_cqe;
case ETH_RX_CQE_TYPE_TPA_CONT:
qede_tpa_cont(edev, rxq,
&cqe->fast_path_tpa_cont);
goto next_cqe;
case ETH_RX_CQE_TYPE_TPA_END:
qede_tpa_end(edev, fp,
&cqe->fast_path_tpa_end);
goto next_rx_only;
default:
break;
}
}
/* Get the data from the SW ring */
sw_rx_index = rxq->sw_rx_cons & NUM_RX_BDS_MAX;
sw_rx_data = &rxq->sw_rx_ring[sw_rx_index];
......@@ -1057,9 +1348,9 @@ static int qede_rx_int(struct qede_fastpath *fp, int budget)
qede_skb_receive(edev, fp, skb, le16_to_cpu(fp_cqe->vlan_tag));
qed_chain_consume(&rxq->rx_bd_ring);
next_rx:
rxq->sw_rx_cons++;
next_rx_only:
rx_pkt++;
next_cqe: /* don't consume bd rx buffer */
......@@ -1952,9 +2243,31 @@ static void qede_free_rx_buffers(struct qede_dev *edev,
}
}
static void qede_free_sge_mem(struct qede_dev *edev,
struct qede_rx_queue *rxq) {
int i;
if (edev->gro_disable)
return;
for (i = 0; i < ETH_TPA_MAX_AGGS_NUM; i++) {
struct qede_agg_info *tpa_info = &rxq->tpa_info[i];
struct sw_rx_data *replace_buf = &tpa_info->replace_buf;
if (replace_buf) {
dma_unmap_page(&edev->pdev->dev,
dma_unmap_addr(replace_buf, mapping),
PAGE_SIZE, DMA_FROM_DEVICE);
__free_page(replace_buf->data);
}
}
}
static void qede_free_mem_rxq(struct qede_dev *edev,
struct qede_rx_queue *rxq)
{
qede_free_sge_mem(edev, rxq);
/* Free rx buffers */
qede_free_rx_buffers(edev, rxq);
......@@ -2010,6 +2323,53 @@ static int qede_alloc_rx_buffer(struct qede_dev *edev,
return 0;
}
static int qede_alloc_sge_mem(struct qede_dev *edev,
struct qede_rx_queue *rxq)
{
dma_addr_t mapping;
int i;
if (edev->gro_disable)
return 0;
if (edev->ndev->mtu > PAGE_SIZE) {
edev->gro_disable = 1;
return 0;
}
for (i = 0; i < ETH_TPA_MAX_AGGS_NUM; i++) {
struct qede_agg_info *tpa_info = &rxq->tpa_info[i];
struct sw_rx_data *replace_buf = &tpa_info->replace_buf;
replace_buf->data = alloc_pages(GFP_ATOMIC, 0);
if (unlikely(!replace_buf->data)) {
DP_NOTICE(edev,
"Failed to allocate TPA skb pool [replacement buffer]\n");
goto err;
}
mapping = dma_map_page(&edev->pdev->dev, replace_buf->data, 0,
rxq->rx_buf_size, DMA_FROM_DEVICE);
if (unlikely(dma_mapping_error(&edev->pdev->dev, mapping))) {
DP_NOTICE(edev,
"Failed to map TPA replacement buffer\n");
goto err;
}
dma_unmap_addr_set(replace_buf, mapping, mapping);
tpa_info->replace_buf.page_offset = 0;
tpa_info->replace_buf_mapping = mapping;
tpa_info->agg_state = QEDE_AGG_STATE_NONE;
}
return 0;
err:
qede_free_sge_mem(edev, rxq);
edev->gro_disable = 1;
return -ENOMEM;
}
/* This function allocates all memory needed per Rx queue */
static int qede_alloc_mem_rxq(struct qede_dev *edev,
struct qede_rx_queue *rxq)
......@@ -2071,6 +2431,8 @@ static int qede_alloc_mem_rxq(struct qede_dev *edev,
num_allocated);
}
qede_alloc_sge_mem(edev, rxq);
return 0;
err:
......@@ -2233,6 +2595,8 @@ static void qede_init_fp(struct qede_dev *edev)
snprintf(fp->name, sizeof(fp->name), "%s-fp-%d",
edev->ndev->name, rss_id);
}
edev->gro_disable = !(edev->ndev->features & NETIF_F_GRO);
}
static int qede_set_real_num_queues(struct qede_dev *edev)
......@@ -2479,6 +2843,7 @@ static int qede_start_queues(struct qede_dev *edev)
return -EINVAL;
}
start.gro_enable = !edev->gro_disable;
start.mtu = edev->ndev->mtu;
start.vport_id = 0;
start.drop_ttl0 = true;
......
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