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Date: Sun, 25 Jan 2015 15:51:23 +0200
From: Amir Vadai <amirv@...lanox.com>
To: Ben Hutchings <ben@...adent.org.uk>
Cc: netdev@...r.kernel.org, Or Gerlitz <ogerlitz@...lanox.com>,
Yevgeny Petrilin <yevgenyp@...lanox.com>,
Saeed Mahameed <saeedm@...lanox.com>,
Eyal Perry <eyalpe@...lanox.com>,
Amir Vadai <amirv@...lanox.com>
Subject: [PATCH ethtool 5/5] ethtool: Support for configurable RSS hash function
From: Eyal Perry <eyalpe@...lanox.com>
This ethtool patch adds support to set and get the current RSS hash
function for the device through through the new hfunc mask field in the
ethtool_rxfh struct. Kernel supported hash function names are queried
with ETHTOOL_GSTRINGS - each string is corresponding with a bit in hfunc
mask according to its index in the string-set.
Signed-off-by: Eyal Perry <eyalpe@...lanox.com>
Signed-off-by: Amir Vadai <amirv@...lanox.com>
---
ethtool.8.in | 7 +++++++
ethtool.c | 56 +++++++++++++++++++++++++++++++++++++++++++++++++++-----
2 files changed, 58 insertions(+), 5 deletions(-)
diff --git a/ethtool.8.in b/ethtool.8.in
index ae56293..bdc77e0 100644
--- a/ethtool.8.in
+++ b/ethtool.8.in
@@ -297,6 +297,8 @@ ethtool \- query or control network driver and hardware settings
.BI weight\ W0
.IR W1
.RB ...\ ]
+.RB [ hfunc
+.IR FUNC ]
.HP
.B ethtool \-f|\-\-flash
.I devname file
@@ -796,6 +798,11 @@ Sets RSS hash key of the specified network device. RSS hash key should be of dev
Hash key format must be in xx:yy:zz:aa:bb:cc format meaning both the nibbles of a byte should be mentioned
even if a nibble is zero.
.TP
+.BI hfunc
+Sets RSS hash function of the specified network device. Requested hash function
+should be supported by the kernel and the device. List of RSS hash functions
+which kernel supports is shown as a part of the --show-rxfh comand output.
+.TP
.BI equal\ N
Sets the receive flow hash indirection table to spread flows evenly
between the first \fIN\fR receive queues.
diff --git a/ethtool.c b/ethtool.c
index c2f4164..c584333 100644
--- a/ethtool.c
+++ b/ethtool.c
@@ -3176,10 +3176,11 @@ static int do_grxfh(struct cmd_context *ctx)
{
struct ethtool_rxfh rss_head = {0};
struct ethtool_rxnfc ring_count;
+ struct ethtool_gstrings *hfuncs;
struct ethtool_rxfh *rss;
u32 i, indir_bytes;
char *hkey;
- int err;
+ int err, cur_len, max_len = 0;
ring_count.cmd = ETHTOOL_GRXRINGS;
err = send_ioctl(ctx, &ring_count);
@@ -3231,6 +3232,23 @@ static int do_grxfh(struct cmd_context *ctx)
printf("%02x:", (u8) hkey[i]);
}
+ printf("RSS hash function:\n");
+ if (!rss->hfunc) {
+ printf(" Operation not supported\n");
+ goto out;
+ }
+ hfuncs = get_stringset(ctx, ETH_SS_RSS_HASH_FUNCS, 0, 1);
+ for (i = 0; i < hfuncs->len; i++) {
+ cur_len = strlen((const char *)hfuncs->data +
+ i * ETH_GSTRING_LEN);
+ if (cur_len > max_len)
+ max_len = cur_len;
+ }
+ for (i = 0; i < hfuncs->len; i++)
+ printf(" %-*s: %s\n", max_len,
+ (const char *)hfuncs->data + i * ETH_GSTRING_LEN,
+ (rss->hfunc & (1 << i)) ? "on" : "off");
+out:
free(rss);
return 0;
}
@@ -3330,12 +3348,15 @@ static int do_srxfh(struct cmd_context *ctx)
struct ethtool_rxfh rss_head = {0};
struct ethtool_rxfh *rss;
struct ethtool_rxnfc ring_count;
+ struct ethtool_gstrings *hfuncs;
int rxfhindir_equal = 0;
char **rxfhindir_weight = NULL;
char *rxfhindir_key = NULL;
+ char *req_hfunc_name = NULL;
+ char *hfunc_name = NULL;
char *hkey = NULL;
- int err = 0;
- u32 arg_num = 0, indir_bytes = 0;
+ int i, err = 0;
+ u32 arg_num = 0, indir_bytes = 0, req_hfunc = 0;
u32 entry_size = sizeof(rss_head.rss_config[0]);
u32 num_weights = 0;
@@ -3364,6 +3385,12 @@ static int do_srxfh(struct cmd_context *ctx)
if (!rxfhindir_key)
exit_bad_args();
++arg_num;
+ } else if (!strcmp(ctx->argp[arg_num], "hfunc")) {
+ ++arg_num;
+ req_hfunc_name = ctx->argp[arg_num];
+ if (!req_hfunc_name)
+ exit_bad_args();
+ ++arg_num;
} else {
exit_bad_args();
}
@@ -3384,7 +3411,8 @@ static int do_srxfh(struct cmd_context *ctx)
rss_head.cmd = ETHTOOL_GRSSH;
err = send_ioctl(ctx, &rss_head);
- if (err < 0 && errno == EOPNOTSUPP && !rxfhindir_key) {
+ if (err < 0 && errno == EOPNOTSUPP &&
+ !rxfhindir_key && !req_hfunc_name) {
return do_srxfhindir(ctx, rxfhindir_equal, rxfhindir_weight,
num_weights);
} else if (err < 0) {
@@ -3402,6 +3430,22 @@ static int do_srxfh(struct cmd_context *ctx)
if (rxfhindir_equal || rxfhindir_weight)
indir_bytes = rss_head.indir_size * entry_size;
+ if (rss_head.hfunc && req_hfunc_name) {
+ hfuncs = get_stringset(ctx, ETH_SS_RSS_HASH_FUNCS, 0, 1);
+ for (i = 0; i < hfuncs->len && !req_hfunc ; i++) {
+ hfunc_name = (char *)(hfuncs->data +
+ i * ETH_GSTRING_LEN);
+ if (!strncmp(hfunc_name, req_hfunc_name,
+ ETH_GSTRING_LEN))
+ req_hfunc = (u32)1 << i;
+ }
+ if (!req_hfunc) {
+ fprintf(stderr,
+ "Unknown hash function: %s\n", req_hfunc_name);
+ return 1;
+ }
+ }
+
rss = calloc(1, sizeof(*rss) + indir_bytes + rss_head.key_size);
if (!rss) {
perror("Cannot allocate memory for RX flow hash config");
@@ -3410,6 +3454,7 @@ static int do_srxfh(struct cmd_context *ctx)
rss->cmd = ETHTOOL_SRSSH;
rss->indir_size = rss_head.indir_size;
rss->key_size = rss_head.key_size;
+ rss->hfunc = req_hfunc ? req_hfunc : 0;
if (fill_indir_table(&rss->indir_size, rss->rss_config, rxfhindir_equal,
rxfhindir_weight, num_weights)) {
@@ -4119,7 +4164,8 @@ static const struct option {
{ "-X|--set-rxfh-indir|--rxfh", 1, do_srxfh,
"Set Rx flow hash indirection and/or hash key",
" [ equal N | weight W0 W1 ... ]\n"
- " [ hkey %x:%x:%x:%x:%x:.... ]\n" },
+ " [ hkey %x:%x:%x:%x:%x:.... ]\n"
+ " [ hfunc FUNC ]\n"},
{ "-f|--flash", 1, do_flash,
"Flash firmware image from the specified file to a region on the device",
" FILENAME [ REGION-NUMBER-TO-FLASH ]\n" },
--
1.9.3
--
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