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path: root/drivers/net/ethernet/chelsio/cxgb4/sge.c
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Diffstat (limited to 'drivers/net/ethernet/chelsio/cxgb4/sge.c')
-rw-r--r--drivers/net/ethernet/chelsio/cxgb4/sge.c154
1 files changed, 133 insertions, 21 deletions
diff --git a/drivers/net/ethernet/chelsio/cxgb4/sge.c b/drivers/net/ethernet/chelsio/cxgb4/sge.c
index b688b32c21fe..0d2eddab04ef 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/sge.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/sge.c
@@ -46,6 +46,9 @@
#ifdef CONFIG_NET_RX_BUSY_POLL
#include <net/busy_poll.h>
#endif /* CONFIG_NET_RX_BUSY_POLL */
+#ifdef CONFIG_CHELSIO_T4_FCOE
+#include <scsi/fc/fc_fcoe.h>
+#endif /* CONFIG_CHELSIO_T4_FCOE */
#include "cxgb4.h"
#include "t4_regs.h"
#include "t4_values.h"
@@ -118,12 +121,6 @@
#define NOMEM_TMR_IDX (SGE_NTIMERS - 1)
/*
- * An FL with <= FL_STARVE_THRES buffers is starving and a periodic timer will
- * attempt to refill it.
- */
-#define FL_STARVE_THRES 4
-
-/*
* Suspend an Ethernet Tx queue with fewer available descriptors than this.
* This is the same as calc_tx_descs() for a TSO packet with
* nr_frags == MAX_SKB_FRAGS.
@@ -141,7 +138,7 @@
* Max Tx descriptor space we allow for an Ethernet packet to be inlined
* into a WR.
*/
-#define MAX_IMM_TX_PKT_LEN 128
+#define MAX_IMM_TX_PKT_LEN 256
/*
* Max size of a WR sent through a control Tx queue.
@@ -245,9 +242,21 @@ static inline unsigned int fl_cap(const struct sge_fl *fl)
return fl->size - 8; /* 1 descriptor = 8 buffers */
}
-static inline bool fl_starving(const struct sge_fl *fl)
+/**
+ * fl_starving - return whether a Free List is starving.
+ * @adapter: pointer to the adapter
+ * @fl: the Free List
+ *
+ * Tests specified Free List to see whether the number of buffers
+ * available to the hardware has falled below our "starvation"
+ * threshold.
+ */
+static inline bool fl_starving(const struct adapter *adapter,
+ const struct sge_fl *fl)
{
- return fl->avail - fl->pend_cred <= FL_STARVE_THRES;
+ const struct sge *s = &adapter->sge;
+
+ return fl->avail - fl->pend_cred <= s->fl_starve_thres;
}
static int map_skb(struct device *dev, const struct sk_buff *skb,
@@ -583,8 +592,10 @@ static unsigned int refill_fl(struct adapter *adap, struct sge_fl *q, int n,
unsigned int cred = q->avail;
__be64 *d = &q->desc[q->pidx];
struct rx_sw_desc *sd = &q->sdesc[q->pidx];
+ int node;
gfp |= __GFP_NOWARN;
+ node = dev_to_node(adap->pdev_dev);
if (s->fl_pg_order == 0)
goto alloc_small_pages;
@@ -593,7 +604,7 @@ static unsigned int refill_fl(struct adapter *adap, struct sge_fl *q, int n,
* Prefer large buffers
*/
while (n) {
- pg = __dev_alloc_pages(gfp, s->fl_pg_order);
+ pg = alloc_pages_node(node, gfp | __GFP_COMP, s->fl_pg_order);
if (unlikely(!pg)) {
q->large_alloc_failed++;
break; /* fall back to single pages */
@@ -623,7 +634,7 @@ static unsigned int refill_fl(struct adapter *adap, struct sge_fl *q, int n,
alloc_small_pages:
while (n--) {
- pg = __dev_alloc_page(gfp);
+ pg = alloc_pages_node(node, gfp, 0);
if (unlikely(!pg)) {
q->alloc_failed++;
break;
@@ -652,7 +663,7 @@ out: cred = q->avail - cred;
q->pend_cred += cred;
ring_fl_db(adap, q);
- if (unlikely(fl_starving(q))) {
+ if (unlikely(fl_starving(adap, q))) {
smp_wmb();
set_bit(q->cntxt_id - adap->sge.egr_start,
adap->sge.starving_fl);
@@ -719,6 +730,22 @@ static void *alloc_ring(struct device *dev, size_t nelem, size_t elem_size,
*/
static inline unsigned int sgl_len(unsigned int n)
{
+ /* A Direct Scatter Gather List uses 32-bit lengths and 64-bit PCI DMA
+ * addresses. The DSGL Work Request starts off with a 32-bit DSGL
+ * ULPTX header, then Length0, then Address0, then, for 1 <= i <= N,
+ * repeated sequences of { Length[i], Length[i+1], Address[i],
+ * Address[i+1] } (this ensures that all addresses are on 64-bit
+ * boundaries). If N is even, then Length[N+1] should be set to 0 and
+ * Address[N+1] is omitted.
+ *
+ * The following calculation incorporates all of the above. It's
+ * somewhat hard to follow but, briefly: the "+2" accounts for the
+ * first two flits which include the DSGL header, Length0 and
+ * Address0; the "(3*(n-1))/2" covers the main body of list entries (3
+ * flits for every pair of the remaining N) +1 if (n-1) is odd; and
+ * finally the "+((n-1)&1)" adds the one remaining flit needed if
+ * (n-1) is odd ...
+ */
n--;
return (3 * n) / 2 + (n & 1) + 2;
}
@@ -766,12 +793,30 @@ static inline unsigned int calc_tx_flits(const struct sk_buff *skb)
unsigned int flits;
int hdrlen = is_eth_imm(skb);
+ /* If the skb is small enough, we can pump it out as a work request
+ * with only immediate data. In that case we just have to have the
+ * TX Packet header plus the skb data in the Work Request.
+ */
+
if (hdrlen)
return DIV_ROUND_UP(skb->len + hdrlen, sizeof(__be64));
+ /* Otherwise, we're going to have to construct a Scatter gather list
+ * of the skb body and fragments. We also include the flits necessary
+ * for the TX Packet Work Request and CPL. We always have a firmware
+ * Write Header (incorporated as part of the cpl_tx_pkt_lso and
+ * cpl_tx_pkt structures), followed by either a TX Packet Write CPL
+ * message or, if we're doing a Large Send Offload, an LSO CPL message
+ * with an embedded TX Packet Write CPL message.
+ */
flits = sgl_len(skb_shinfo(skb)->nr_frags + 1) + 4;
if (skb_shinfo(skb)->gso_size)
- flits += 2;
+ flits += (sizeof(struct fw_eth_tx_pkt_wr) +
+ sizeof(struct cpl_tx_pkt_lso_core) +
+ sizeof(struct cpl_tx_pkt_core)) / sizeof(__be64);
+ else
+ flits += (sizeof(struct fw_eth_tx_pkt_wr) +
+ sizeof(struct cpl_tx_pkt_core)) / sizeof(__be64);
return flits;
}
@@ -1044,6 +1089,38 @@ static inline void txq_advance(struct sge_txq *q, unsigned int n)
q->pidx -= q->size;
}
+#ifdef CONFIG_CHELSIO_T4_FCOE
+static inline int
+cxgb_fcoe_offload(struct sk_buff *skb, struct adapter *adap,
+ const struct port_info *pi, u64 *cntrl)
+{
+ const struct cxgb_fcoe *fcoe = &pi->fcoe;
+
+ if (!(fcoe->flags & CXGB_FCOE_ENABLED))
+ return 0;
+
+ if (skb->protocol != htons(ETH_P_FCOE))
+ return 0;
+
+ skb_reset_mac_header(skb);
+ skb->mac_len = sizeof(struct ethhdr);
+
+ skb_set_network_header(skb, skb->mac_len);
+ skb_set_transport_header(skb, skb->mac_len + sizeof(struct fcoe_hdr));
+
+ if (!cxgb_fcoe_sof_eof_supported(adap, skb))
+ return -ENOTSUPP;
+
+ /* FC CRC offload */
+ *cntrl = TXPKT_CSUM_TYPE(TX_CSUM_FCOE) |
+ TXPKT_L4CSUM_DIS | TXPKT_IPCSUM_DIS |
+ TXPKT_CSUM_START(CXGB_FCOE_TXPKT_CSUM_START) |
+ TXPKT_CSUM_END(CXGB_FCOE_TXPKT_CSUM_END) |
+ TXPKT_CSUM_LOC(CXGB_FCOE_TXPKT_CSUM_END);
+ return 0;
+}
+#endif /* CONFIG_CHELSIO_T4_FCOE */
+
/**
* t4_eth_xmit - add a packet to an Ethernet Tx queue
* @skb: the packet
@@ -1066,6 +1143,9 @@ netdev_tx_t t4_eth_xmit(struct sk_buff *skb, struct net_device *dev)
const struct skb_shared_info *ssi;
dma_addr_t addr[MAX_SKB_FRAGS + 1];
bool immediate = false;
+#ifdef CONFIG_CHELSIO_T4_FCOE
+ int err;
+#endif /* CONFIG_CHELSIO_T4_FCOE */
/*
* The chip min packet length is 10 octets but play safe and reject
@@ -1082,6 +1162,13 @@ out_free: dev_kfree_skb_any(skb);
q = &adap->sge.ethtxq[qidx + pi->first_qset];
reclaim_completed_tx(adap, &q->q, true);
+ cntrl = TXPKT_L4CSUM_DIS | TXPKT_IPCSUM_DIS;
+
+#ifdef CONFIG_CHELSIO_T4_FCOE
+ err = cxgb_fcoe_offload(skb, adap, pi, &cntrl);
+ if (unlikely(err == -ENOTSUPP))
+ goto out_free;
+#endif /* CONFIG_CHELSIO_T4_FCOE */
flits = calc_tx_flits(skb);
ndesc = flits_to_desc(flits);
@@ -1153,13 +1240,17 @@ out_free: dev_kfree_skb_any(skb);
if (skb->ip_summed == CHECKSUM_PARTIAL) {
cntrl = hwcsum(skb) | TXPKT_IPCSUM_DIS;
q->tx_cso++;
- } else
- cntrl = TXPKT_L4CSUM_DIS | TXPKT_IPCSUM_DIS;
+ }
}
if (skb_vlan_tag_present(skb)) {
q->vlan_ins++;
cntrl |= TXPKT_VLAN_VLD | TXPKT_VLAN(skb_vlan_tag_get(skb));
+#ifdef CONFIG_CHELSIO_T4_FCOE
+ if (skb->protocol == htons(ETH_P_FCOE))
+ cntrl |= TXPKT_VLAN(
+ ((skb->priority & 0x7) << VLAN_PRIO_SHIFT));
+#endif /* CONFIG_CHELSIO_T4_FCOE */
}
cpl->ctrl0 = htonl(TXPKT_OPCODE(CPL_TX_PKT_XT) |
@@ -1759,6 +1850,9 @@ int t4_ethrx_handler(struct sge_rspq *q, const __be64 *rsp,
struct sge *s = &q->adap->sge;
int cpl_trace_pkt = is_t4(q->adap->params.chip) ?
CPL_TRACE_PKT : CPL_TRACE_PKT_T5;
+#ifdef CONFIG_CHELSIO_T4_FCOE
+ struct port_info *pi;
+#endif
if (unlikely(*(u8 *)rsp == cpl_trace_pkt))
return handle_trace_pkt(q->adap, si);
@@ -1799,8 +1893,24 @@ int t4_ethrx_handler(struct sge_rspq *q, const __be64 *rsp,
skb->ip_summed = CHECKSUM_COMPLETE;
rxq->stats.rx_cso++;
}
- } else
+ } else {
skb_checksum_none_assert(skb);
+#ifdef CONFIG_CHELSIO_T4_FCOE
+#define CPL_RX_PKT_FLAGS (RXF_PSH_F | RXF_SYN_F | RXF_UDP_F | \
+ RXF_TCP_F | RXF_IP_F | RXF_IP6_F | RXF_LRO_F)
+
+ pi = netdev_priv(skb->dev);
+ if (!(pkt->l2info & cpu_to_be32(CPL_RX_PKT_FLAGS))) {
+ if ((pkt->l2info & cpu_to_be32(RXF_FCOE_F)) &&
+ (pi->fcoe.flags & CXGB_FCOE_ENABLED)) {
+ if (!(pkt->err_vec & cpu_to_be16(RXERR_CSUM_F)))
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+ }
+ }
+
+#undef CPL_RX_PKT_FLAGS
+#endif /* CONFIG_CHELSIO_T4_FCOE */
+ }
if (unlikely(pkt->vlan_ex)) {
__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), ntohs(pkt->vlan));
@@ -1900,7 +2010,7 @@ static int process_responses(struct sge_rspq *q, int budget)
if (!is_new_response(rc, q))
break;
- rmb();
+ dma_rmb();
rsp_type = RSPD_TYPE(rc->type_gen);
if (likely(rsp_type == RSP_TYPE_FLBUF)) {
struct page_frag *fp;
@@ -2092,7 +2202,7 @@ static unsigned int process_intrq(struct adapter *adap)
if (!is_new_response(rc, q))
break;
- rmb();
+ dma_rmb();
if (RSPD_TYPE(rc->type_gen) == RSP_TYPE_INTR) {
unsigned int qid = ntohl(rc->pldbuflen_qid);
@@ -2128,7 +2238,8 @@ static irqreturn_t t4_intr_msi(int irq, void *cookie)
{
struct adapter *adap = cookie;
- t4_slow_intr_handler(adap);
+ if (adap->flags & MASTER_PF)
+ t4_slow_intr_handler(adap);
process_intrq(adap);
return IRQ_HANDLED;
}
@@ -2143,7 +2254,8 @@ static irqreturn_t t4_intr_intx(int irq, void *cookie)
struct adapter *adap = cookie;
t4_write_reg(adap, MYPF_REG(PCIE_PF_CLI_A), 0);
- if (t4_slow_intr_handler(adap) | process_intrq(adap))
+ if (((adap->flags & MASTER_PF) && t4_slow_intr_handler(adap)) |
+ process_intrq(adap))
return IRQ_HANDLED;
return IRQ_NONE; /* probably shared interrupt */
}
@@ -2180,7 +2292,7 @@ static void sge_rx_timer_cb(unsigned long data)
clear_bit(id, s->starving_fl);
smp_mb__after_atomic();
- if (fl_starving(fl)) {
+ if (fl_starving(adap, fl)) {
rxq = container_of(fl, struct sge_eth_rxq, fl);
if (napi_reschedule(&rxq->rspq.napi))
fl->starving++;
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.